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<a class="article-title" href="/2019/05/17/spring初识/">spring初识</a>
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<h1 id="spring初识"><a href="#spring初识" class="headerlink" title="spring初识"></a>spring初识</h1><hr>
<p>在阅读一些框架源码时发现很多关于spring很有意思的使用方式，希望能系统的了解下spring的功能，我大体想了解以下几点：</p>
<blockquote>
<ul>
<li>bean的生命周期管理和bean容器</li>
<li>aop切面</li>
</ul>
</blockquote>
<hr>
<h2 id="bean容器"><a href="#bean容器" class="headerlink" title="bean容器"></a>bean容器</h2><ul>
<li>beanFactory，容器的简单实现，其他容器的基础；</li>
<li>上下文容器，如ApplicationContext。</li>
</ul>
<h3 id="1-上下文容器"><a href="#1-上下文容器" class="headerlink" title="1. 上下文容器"></a>1. 上下文容器</h3><ul>
<li>AnnotationConfigApplicationContext java配置类</li>
<li>AnnotationConfigWebApplicationContext java配置类加载Springweb</li>
<li>ClassPathXmlApplicationContext 类路径下XML配置</li>
<li>FileSystemApplicationContext 文件系统XMlpei</li>
<li>XmlWebApplicationContext 从web获取XMl配置</li>
</ul>
<h3 id="2-bean生命周期"><a href="#2-bean生命周期" class="headerlink" title="2. bean生命周期"></a>2. bean生命周期</h3><h2 id="bean生命周期是由beanFactory要求实现的初始化工厂需要的方法及顺序。"><a href="#bean生命周期是由beanFactory要求实现的初始化工厂需要的方法及顺序。" class="headerlink" title="bean生命周期是由beanFactory要求实现的初始化工厂需要的方法及顺序。"></a>bean生命周期是由beanFactory要求实现的初始化工厂需要的方法及顺序。</h2><p>BeanFactory注释</p>
<p>Bean factory实现应该尽可能支持标准bean生命周期接口，完整的初始化方法及其标准顺序是:</p>
<ul>
<li><ol>
<li><code>BeanNameAware.setBeanName</code></li>
</ol>
</li>
<li><ol start="2">
<li><code>BeanClassLoaderAware.setBeanClassLoader</code></li>
</ol>
</li>
<li><ol start="3">
<li><code>BeanFactoryAware.setBeanFactory</code></li>
</ol>
</li>
<li><ol start="4">
<li><code>EnvironmentAware.setEnvironment</code></li>
</ol>
</li>
<li><ol start="5">
<li>EmbeddedValueResolverAware.setEmbeddedValueResolver</li>
</ol>
</li>
<li><ol start="6">
<li>ResourceLoaderAware.setResourceLoader<br>only applicable when running in an application context)</li>
</ol>
</li>
<li><ol start="7">
<li>ApplicationEventPublisherAware.setApplicationEventPublisher<br>only applicable when running in an application context)</li>
</ol>
</li>
<li><ol start="8">
<li>MessageSourceAware.setMessageSource<br>//only applicable when running in an application context)</li>
</ol>
</li>
<li><ol start="9">
<li><code>ApplicationContextAware.setApplicationContext</code><br>only applicable when running in an application context)</li>
</ol>
</li>
<li><ol start="10">
<li>ServletContextAware.setServletContext<br>only applicable when running in a web application context)</li>
</ol>
</li>
<li><ol start="11">
<li><code>BeanPostProcessors.postProcessBeforeInitialization</code></li>
</ol>
</li>
<li><ol start="12">
<li><code>InitializingBean.afterPropertiesSet</code></li>
</ol>
</li>
<li><ol start="13">
<li><code>a custom init-method definition</code></li>
</ol>
</li>
<li><ol start="14">
<li><code>BeanPostProcessors.postProcessAfterInitialization</code></li>
</ol>
</li>
</ul>
<p>bean关闭时会调用的方法:</p>
<ul>
<li><ol>
<li><code>DestructionAwareBeanPostProcessors.postProcessBeforeDestruction</code></li>
</ol>
</li>
<li><ol start="2">
<li><code>DisposableBean.destroy</code></li>
</ol>
</li>
<li><ol start="3">
<li><code>a custom destroy-method definition</code></li>
</ol>
</li>
</ul>
<hr>
<h3 id="3-上下文配置方案"><a href="#3-上下文配置方案" class="headerlink" title="3. 上下文配置方案"></a>3. 上下文配置方案</h3><ul>
<li>XML</li>
<li>java类</li>
<li><h2 id="隐式发现机制，自动装配"><a href="#隐式发现机制，自动装配" class="headerlink" title="隐式发现机制，自动装配"></a>隐式发现机制，自动装配</h2><h2 id="2-装配Bean"><a href="#2-装配Bean" class="headerlink" title="2.装配Bean"></a>2.装配Bean</h2></li>
</ul>
<hr>
<h3 id="1-自动化装配"><a href="#1-自动化装配" class="headerlink" title="1.自动化装配"></a>1.自动化装配</h3><p>标注Bean的注解：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">- @Component 是一个泛化的概念，仅仅表示一个组件 (Bean) ，可以作用在任何层次。</span><br><span class="line">- @Named Component 替代方案</span><br><span class="line">- @Service 通常作用在业务层，但是目前该功能与 @Component 相同。</span><br><span class="line">- @Constroller 通常作用在控制层，但是目前该功能与 @Component 相同。</span><br><span class="line">- @Repository 通常作用在DAO层，但是目前该功能与 @Component 相同。</span><br></pre></td></tr></table></figure>
<p>标注Bean扫描路径方式：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">- @ComponentScan 是一个泛化的概念，仅仅表示一个组件 (Bean) ，可以作用在任何层次。</span><br><span class="line">- <context:component-scan base-package = "net.xxx"/></span><br></pre></td></tr></table></figure>
<p>注入方式：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">- @Resource 默认通过按照名称byName自动注入，也可通过type或name属性指定。</span><br><span class="line">- @Autowired 按照类型（byType）装配依赖对象</span><br><span class="line">- @Inject 同@Autowired</span><br></pre></td></tr></table></figure>
<hr>
<h3 id="2-第三方jar包类配置Bean"><a href="#2-第三方jar包类配置Bean" class="headerlink" title="2.第三方jar包类配置Bean"></a>2.第三方jar包类配置Bean</h3><ul>
<li><ol>
<li>配置类<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">@Configuration 表明该类是配置类</span><br><span class="line"></span><br><span class="line">@Bean 表明该方法返回值需要注册为bean，方法名是生成的bean名称</span><br><span class="line">带有注解的方法多次调用时返回值是单例。</span><br><span class="line">@Bean</span><br><span class="line">private A a(){，例如b，c方法中a()返回值是一样的。</span><br><span class="line">return new A();</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line">@Bean</span><br><span class="line">private B b(){</span><br><span class="line">return new B(a());</span><br><span class="line">}</span><br><span class="line">@Bean</span><br><span class="line">private C c(){</span><br><span class="line">return new C(a());</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ol>
</li>
<li><ol start="2">
<li>XML配置<br>略</li>
</ol>
</li>
</ul>
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