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<p></p><div class="toc"><h3>文章目录</h3><ul><li><a href="#13bean_9" rel="nofollow">1.依赖注入的3种方式(获取bean对象)</a></li><ul><li><a href="#11__10" rel="nofollow">1.1 构造函数注入</a></li><li><a href="#12_set_34" rel="nofollow">1.2 使用set方法注入</a></li><li><a href="#13__54" rel="nofollow">1.3 注解注入</a></li></ul><li><a href="#2_3_58" rel="nofollow">2. 依赖注入的3类数据(其实就是设定参数值)</a></li><li><a href="#3__109" rel="nofollow">3. 案例</a></li></ul></div><br>
<strong>1.IOC的作用</strong>：降低程序之间的耦合(依赖关系)<br>
<strong>2.依赖关系的管理</strong>：以后都交给spring来维护。<br>
在当前类需要用到其他类的对象，由spring来提供，我们只需要在配置文件中说明依赖关系的维护，称为依赖注入。<br>
<strong>3.依赖注入：</strong><br>
<font color="red"><strong>能注入的数据有3类</strong>：基本类型和Spring；其他bean类型(在配置文件中或者注解配置过的bean); 复杂类型/集合类型<br>
<font color="green"><strong>注入的方式有3种</strong>：(1)使用构造函数提供；(2)使用set方法提供;(3)使用注解提供</font></font><p></p>
<hr>
<h1><a id="13bean_9"></a>1.依赖注入的3种方式(获取bean对象)</h1>
<h2><a id="11__10"></a>1.1 构造函数注入</h2>
<p>使用的标签：<strong>constructor-arg</strong><br>
标签出现的位置：<strong>bean标签的内部</strong><br>
标签中的属性：</p>
<ul>
<li><strong>type</strong>:用于指定要注入的数据的数据类型，该数据类型也是构造函数中某个或某些参数的类型。</li>
<li><strong>index</strong>:用于指定要注入的数据给构造函数中指定索引位置的参数赋值。索引的位置从0开始</li>
<li><strong>name</strong>:用于指定给构造函数中指定名称的参数赋值 <strong>(常用)</strong><br>
<mark>以上三个用于指定给构造函数中哪个参数赋值</mark></li>
<li><strong>value</strong>:用于提供基本类型和String类型的数据</li>
<li><strong>ref</strong>:用于<strong>指定其他的bean类型数据</strong>。它指的就是在spring的Ioc核心容器中出现过的bean对象</li>
</ul>
<p><strong>优势</strong>：在获取bean对象时，<strong>注入数据是必须的操作，否则对象无法创建成功。</strong><br>
<strong>弊端</strong>：改变了bean对象的实例化方式，使我们在创建对象时，如果用不到这些数据，也必须提供。<br>
<img src="https://img-blog.csdnimg.cn/20200216180302548.png" alt="在这里插入图片描述"></p>
<pre><code class="prism language-java"> <span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"accountService"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"com.jh.service.impl.AccountServiceImpl"</span><span class="token operator">></span>
<span class="token operator"><</span>constructor<span class="token operator">-</span>arg name<span class="token operator">=</span><span class="token string">"name"</span> value<span class="token operator">=</span><span class="token string">"张三"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>constructor<span class="token operator">-</span>arg<span class="token operator">></span>
<span class="token operator"><</span>constructor<span class="token operator">-</span>arg name<span class="token operator">=</span><span class="token string">"age"</span> value<span class="token operator">=</span><span class="token string">"23"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>constructor<span class="token operator">-</span>arg<span class="token operator">></span>
<span class="token operator"><</span>constructor<span class="token operator">-</span>arg name<span class="token operator">=</span><span class="token string">"birthday"</span> ref<span class="token operator">=</span><span class="token string">"date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>constructor<span class="token operator">-</span>arg<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span>配置一个日期对象<span class="token operator">--</span><span class="token operator">></span>
<span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"date"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"java.util.Date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
</code></pre>
<h2><a id="12_set_34"></a>1.2 使用set方法注入</h2>
<p>涉及的标签：<strong>property</strong>，出现的位置在 <strong>bean标签的内部</strong><br>
标签属性：</p>
<ul>
<li><strong>name</strong>: 用于指定注入时所调用的set方法名称</li>
<li><strong>value</strong>:用于提供基本类型和String类型的数据</li>
<li><strong>ref</strong> ：用于指定其他的bean类型数据。它指的就是在spring的Ioc核心容器中出现过的bean对象</li>
</ul>
<p><strong>优势</strong>：创建对象没有明确的限制，可以直接使用默认构造函数<br>
<strong>弊端</strong>：如果有某个成员必须有值，则获取对象是有可能set方法没有执行。<br>
<img src="https://img-blog.csdnimg.cn/20200216181049528.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0pIMzk0NTYxOTQ=,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<pre><code class="prism language-java"> <span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"accountService2"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"com.jh.service.impl.AccountServiceImpl2"</span><span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"name"</span> value<span class="token operator">=</span><span class="token string">"李四"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"age"</span> value<span class="token operator">=</span><span class="token string">"21"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"birthday"</span> ref<span class="token operator">=</span><span class="token string">"date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span>配置一个日期对象<span class="token operator">--</span><span class="token operator">></span>
<span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"date"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"java.util.Date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
</code></pre>
<h2><a id="13__54"></a>1.3 注解注入</h2>
<p><a href="https://blog.csdn.net/JH39456194/article/details/104343081">用于创建bean对象的注解</a></p>
<hr>
<h1><a id="2_3_58"></a>2. 依赖注入的3类数据(其实就是设定参数值)</h1>
<p>在依赖注入的3种方式中都有数据的注入<br>
<strong>(1) 基本类型和Spring的注入</strong><br>
<img src="https://img-blog.csdnimg.cn/20200216174552158.png" alt="在这里插入图片描述"><br>
<strong>(2)其他bean类型(在配置文件中或者注解配置过的bean)的注入</strong><br>
<img src="https://img-blog.csdnimg.cn/2020021617493212.png" alt="在这里插入图片描述"><br>
<strong>(3) 复杂类型的注入/集合类型的注入</strong><br>
用于给List结构集合注入的标签： list,array,set<br>
用于给Map结构集合注入的标签： map props<br>
结构相同，标签可以互换<br>
<img src="https://img-blog.csdnimg.cn/20200216185524662.png" alt="在这里插入图片描述"></p>
<pre><code class="prism language-java"><span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"accountService3"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"com.jh.service.impl.AccountServiceImpl3"</span><span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myStrs"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>array<span class="token punctuation">></span></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>胡歌<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>胡天<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>沙溢<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>array<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myList"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>list<span class="token punctuation">></span></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>小狗<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>小猫<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>老鼠<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>list<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"mySet"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>set<span class="token punctuation">></span></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>玫瑰<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>菊花<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>康乃馨<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>set<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myMap"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>map<span class="token punctuation">></span></span>
<span class="token operator"><</span>entry key<span class="token operator">=</span><span class="token string">"a"</span> value<span class="token operator">=</span><span class="token string">"苹果"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>entry<span class="token operator">></span>
<span class="token operator"><</span>entry key<span class="token operator">=</span><span class="token string">"b"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>香蕉<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>entry<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>map<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myProps"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>props<span class="token punctuation">></span></span>
<span class="token operator"><</span>prop key<span class="token operator">=</span><span class="token string">"1"</span><span class="token operator">></span>ccc<span class="token operator"><</span><span class="token operator">/</span>prop<span class="token operator">></span>
<span class="token operator"><</span>prop key<span class="token operator">=</span><span class="token string">"2"</span><span class="token operator">></span>dd<span class="token operator"><</span><span class="token operator">/</span>prop<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>props<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
</code></pre>
<hr>
<h1><a id="3__109"></a>3. 案例</h1>
<p><strong>bean.xml</strong></p>
<pre><code class="prism language-java"><span class="token operator"><</span><span class="token operator">?</span>xml version<span class="token operator">=</span><span class="token string">"1.0"</span> encoding<span class="token operator">=</span><span class="token string">"UTF-8"</span><span class="token operator">?</span><span class="token operator">></span>
<span class="token operator"><</span>beans xmlns<span class="token operator">=</span><span class="token string">"http://www.springframework.org/schema/beans"</span>
xmlns<span class="token operator">:</span>xsi<span class="token operator">=</span><span class="token string">"http://www.w3.org/2001/XMLSchema-instance"</span>
xsi<span class="token operator">:</span>schemaLocation<span class="token operator">=</span>"http<span class="token operator">:</span><span class="token operator">/</span><span class="token operator">/</span>www<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>org<span class="token operator">/</span>schema<span class="token operator">/</span>beans
http<span class="token operator">:</span><span class="token operator">/</span><span class="token operator">/</span>www<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>org<span class="token operator">/</span>schema<span class="token operator">/</span>beans<span class="token operator">/</span>spring<span class="token operator">-</span>beans<span class="token punctuation">.</span>xsd"<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>构造函数注入：<span class="token operator">--</span><span class="token operator">></span>
<span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"accountService"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"com.jh.service.impl.AccountServiceImpl"</span><span class="token operator">></span>
<span class="token operator"><</span>constructor<span class="token operator">-</span>arg name<span class="token operator">=</span><span class="token string">"name"</span> value<span class="token operator">=</span><span class="token string">"张三"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>constructor<span class="token operator">-</span>arg<span class="token operator">></span>
<span class="token operator"><</span>constructor<span class="token operator">-</span>arg name<span class="token operator">=</span><span class="token string">"age"</span> value<span class="token operator">=</span><span class="token string">"23"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>constructor<span class="token operator">-</span>arg<span class="token operator">></span>
<span class="token operator"><</span>constructor<span class="token operator">-</span>arg name<span class="token operator">=</span><span class="token string">"birthday"</span> ref<span class="token operator">=</span><span class="token string">"date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>constructor<span class="token operator">-</span>arg<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span>配置一个日期对象<span class="token operator">--</span><span class="token operator">></span>
<span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"date"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"java.util.Date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span>使用set方法注入：<span class="token operator">--</span><span class="token operator">></span>
<span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"accountService2"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"com.jh.service.impl.AccountServiceImpl2"</span><span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"name"</span> value<span class="token operator">=</span><span class="token string">"李四"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"age"</span> value<span class="token operator">=</span><span class="token string">"21"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"birthday"</span> ref<span class="token operator">=</span><span class="token string">"date"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span>复杂类型的注入<span class="token operator">/</span>集合类型的注入<span class="token operator">--</span><span class="token operator">></span>
<span class="token operator"><</span>bean id<span class="token operator">=</span><span class="token string">"accountService3"</span> <span class="token keyword">class</span><span class="token operator">=</span><span class="token string">"com.jh.service.impl.AccountServiceImpl3"</span><span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myStrs"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>array<span class="token punctuation">></span></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>胡歌<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>胡天<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>沙溢<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>array<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myList"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>list<span class="token punctuation">></span></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>小狗<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>小猫<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>老鼠<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>list<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"mySet"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>set<span class="token punctuation">></span></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>玫瑰<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>菊花<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>康乃馨<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>set<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myMap"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>map<span class="token punctuation">></span></span>
<span class="token operator"><</span>entry key<span class="token operator">=</span><span class="token string">"a"</span> value<span class="token operator">=</span><span class="token string">"苹果"</span><span class="token operator">></span><span class="token operator"><</span><span class="token operator">/</span>entry<span class="token operator">></span>
<span class="token operator"><</span>entry key<span class="token operator">=</span><span class="token string">"b"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>value<span class="token punctuation">></span></span>香蕉<span class="token operator"><</span><span class="token operator">/</span>value<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>entry<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>map<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span>property name<span class="token operator">=</span><span class="token string">"myProps"</span><span class="token operator">></span>
<span class="token generics function"><span class="token punctuation"><</span>props<span class="token punctuation">></span></span>
<span class="token operator"><</span>prop key<span class="token operator">=</span><span class="token string">"1"</span><span class="token operator">></span>ccc<span class="token operator"><</span><span class="token operator">/</span>prop<span class="token operator">></span>
<span class="token operator"><</span>prop key<span class="token operator">=</span><span class="token string">"2"</span><span class="token operator">></span>dd<span class="token operator"><</span><span class="token operator">/</span>prop<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>props<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>property<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>bean<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>beans<span class="token operator">></span>
</code></pre>
<hr>
<p><strong>com\jh\service业务层接口</strong></p>
<pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">IAccountService</span> <span class="token punctuation">{</span>
<span class="token keyword">void</span> <span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<hr>
<p><strong>com\jh\service\impl业务层3个实现类</strong></p>
<p><strong>(1)构造函数注入:AccountServiceImpl</strong></p>
<pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>impl<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>IAccountService<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>Date<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AccountServiceImpl</span> <span class="token keyword">implements</span> <span class="token class-name">IAccountService</span> <span class="token punctuation">{</span>
<span class="token comment">//如果是经常变化的数据，并不适用于注入的方式</span>
<span class="token keyword">private</span> String name<span class="token punctuation">;</span>
<span class="token keyword">private</span> Integer age<span class="token punctuation">;</span>
<span class="token keyword">private</span> Date birthday<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token function">AccountServiceImpl</span><span class="token punctuation">(</span>String name<span class="token punctuation">,</span> Integer age<span class="token punctuation">,</span> Date birthday<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>birthday <span class="token operator">=</span> birthday<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"AccountServiceImpl执行了"</span><span class="token operator">+</span>name<span class="token operator">+</span><span class="token string">","</span><span class="token operator">+</span>age<span class="token operator">+</span><span class="token string">","</span><span class="token operator">+</span>birthday<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p><strong>(2)使用set方法注入:AccountServiceImpl2</strong></p>
<pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>impl<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>IAccountService<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>Date<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AccountServiceImpl2</span> <span class="token keyword">implements</span> <span class="token class-name">IAccountService</span> <span class="token punctuation">{</span>
<span class="token comment">//如果是经常变化的数据，并不适用于注入的方式</span>
<span class="token keyword">private</span> String name<span class="token punctuation">;</span>
<span class="token keyword">private</span> Integer age<span class="token punctuation">;</span>
<span class="token keyword">private</span> Date birthday<span class="token punctuation">;</span>
<span class="token keyword">public</span> String <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> name<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setName</span><span class="token punctuation">(</span>String name<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> Integer <span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> age<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setAge</span><span class="token punctuation">(</span>Integer age<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> Date <span class="token function">getBirthday</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> birthday<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setBirthday</span><span class="token punctuation">(</span>Date birthday<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>birthday <span class="token operator">=</span> birthday<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"AccountServiceImpl2执行了"</span><span class="token operator">+</span>name<span class="token operator">+</span><span class="token string">","</span><span class="token operator">+</span>age<span class="token operator">+</span><span class="token string">","</span><span class="token operator">+</span>birthday<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p><strong>注入复杂类型/集合类型 数据：AccountServiceImpl3</strong></p>
<pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>impl<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>IAccountService<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>*<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AccountServiceImpl3</span> <span class="token keyword">implements</span> <span class="token class-name">IAccountService</span> <span class="token punctuation">{</span>
<span class="token keyword">private</span> String<span class="token punctuation">[</span><span class="token punctuation">]</span> myStrs<span class="token punctuation">;</span>
<span class="token keyword">private</span> List<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> myList<span class="token punctuation">;</span>
<span class="token keyword">private</span> Set<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> mySet<span class="token punctuation">;</span>
<span class="token keyword">private</span> Map<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">,</span>String<span class="token punctuation">></span></span> myMap<span class="token punctuation">;</span>
<span class="token keyword">private</span> Properties myProps<span class="token punctuation">;</span>
<span class="token keyword">public</span> String<span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token function">getMyStrs</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> myStrs<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setMyStrs</span><span class="token punctuation">(</span>String<span class="token punctuation">[</span><span class="token punctuation">]</span> myStrs<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>myStrs <span class="token operator">=</span> myStrs<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> List<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> <span class="token function">getMyList</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> myList<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setMyList</span><span class="token punctuation">(</span>List<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> myList<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>myList <span class="token operator">=</span> myList<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> Set<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> <span class="token function">getMySet</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> mySet<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setMySet</span><span class="token punctuation">(</span>Set<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> mySet<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>mySet <span class="token operator">=</span> mySet<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> Map<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">,</span> String<span class="token punctuation">></span></span> <span class="token function">getMyMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> myMap<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setMyMap</span><span class="token punctuation">(</span>Map<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">,</span> String<span class="token punctuation">></span></span> myMap<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>myMap <span class="token operator">=</span> myMap<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> Properties <span class="token function">getMyProps</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> myProps<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setMyProps</span><span class="token punctuation">(</span>Properties myProps<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>myProps <span class="token operator">=</span> myProps<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
<span class="token comment">//数组需要用 Arrays</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>Arrays<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span>myStrs<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>myList<span class="token punctuation">)</span><span class="token punctuation">;</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>mySet<span class="token punctuation">)</span><span class="token punctuation">;</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>myMap<span class="token punctuation">)</span><span class="token punctuation">;</span>
System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>myProps<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p><strong>Client.java</strong></p>
<pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>ui<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>IAccountService<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>jh<span class="token punctuation">.</span>service<span class="token punctuation">.</span>impl<span class="token punctuation">.</span>AccountServiceImpl<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>beans<span class="token punctuation">.</span>factory<span class="token punctuation">.</span>BeanFactory<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>beans<span class="token punctuation">.</span>factory<span class="token punctuation">.</span>xml<span class="token punctuation">.</span>XmlBeanFactory<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>context<span class="token punctuation">.</span>ApplicationContext<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>context<span class="token punctuation">.</span>support<span class="token punctuation">.</span>ClassPathXmlApplicationContext<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>context<span class="token punctuation">.</span>support<span class="token punctuation">.</span>FileSystemXmlApplicationContext<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>core<span class="token punctuation">.</span>io<span class="token punctuation">.</span>ClassPathResource<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>core<span class="token punctuation">.</span>io<span class="token punctuation">.</span>Resource<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Client</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span>String<span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//--------ApplicationContext 立即加载----------------------</span>
<span class="token comment">//1.获取核心容器对象</span>
ApplicationContext ac<span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ClassPathXmlApplicationContext</span><span class="token punctuation">(</span><span class="token string">"bean.xml"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//2.根据id获取Bean对象</span>
<span class="token comment">//(1)构造函数注入</span>
IAccountService as<span class="token operator">=</span> <span class="token punctuation">(</span>IAccountService<span class="token punctuation">)</span>ac<span class="token punctuation">.</span><span class="token function">getBean</span><span class="token punctuation">(</span><span class="token string">"accountService"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
as<span class="token punctuation">.</span><span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//AccountServiceImpl执行了张三,23,Sat Feb 15 17:13:06 CST 2020</span>
<span class="token comment">//(2)使用set方法注入</span>
IAccountService as2<span class="token operator">=</span> <span class="token punctuation">(</span>IAccountService<span class="token punctuation">)</span>ac<span class="token punctuation">.</span><span class="token function">getBean</span><span class="token punctuation">(</span><span class="token string">"accountService2"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
as2<span class="token punctuation">.</span><span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//AccountServiceImpl2执行了李四,21,Sat Feb 15 17:44:31 CST 2020</span>
<span class="token comment">//使用set方法注入 复杂类型/集合类型 数据</span>
IAccountService as3<span class="token operator">=</span> <span class="token punctuation">(</span>IAccountService<span class="token punctuation">)</span>ac<span class="token punctuation">.</span><span class="token function">getBean</span><span class="token punctuation">(</span><span class="token string">"accountService3"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
as3<span class="token punctuation">.</span><span class="token function">saveAccount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
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