对于嵌入式的beans标签,想信大家很少使用过,或者接触过,起码,我本人就没用过. 它非常类似于Import标签所提供的功能;

使用如下:

　　对这个beans没什么太多可讲,解析代码如下:

1 protected void doRegisterBeanDefinitions(Element root) { 2         String profileSpec = root.getAttribute(PROFILE_ATTRIBUTE); 3         // 处理profile属性 4         /* 5          * this is header... 6          *  7          * 
     10          * 11          * web.xml12          * 13          * 
     
      14          * 15          * 
      
       Spring.profiles.active
      16          * 17          * 
      
       dev
      18          * 19          * 
     20          */21         if (StringUtils.hasText(profileSpec)) {22             Assert.state(this.environment != null,23                     "Environment must be set for evaluating profiles");24             String[] specifiedProfiles = StringUtils.tokenizeToStringArray(profileSpec,25                     BeanDefinitionParserDelegate.MULTI_VALUE_ATTRIBUTE_DELIMITERS);26             if (!this.environment.acceptsProfiles(specifiedProfiles)) {27                 return;28             }29         }30 31         // Any nested 
     
       elements will cause recursion in this method. In32         // order to propagate and preserve 
      
        default-* attributes correctly,33         // keep track of the current (parent) delegate, which may be null. Create34         // the new (child) delegate with a reference to the parent for fallback purposes,35         // then ultimately reset this.delegate back to its original (parent) reference.36         // this behavior emulates a stack of delegates without actually necessitating one.37         // 专门处理解析38         BeanDefinitionParserDelegate parent = this.delegate;39         this.delegate = createDelegate(this.readerContext, root, parent);40         // 解析前留给子类实现41         preProcessXml(root);42 43         parseBeanDefinitions(root, this.delegate);44         // 解析后留给子类实现45         postProcessXml(root);46 47         this.delegate = parent;48     }