spring动态注入bean

//动态注入的方法

/**
  * 通过BeanDefinition注册bean到spring context，无则加入，有则修改
  * @param cxt spring context
  * @param beanId
  * @param classPath 类路径
  * @param pvs bean属性值
  */
 public void reg(ApplicationContext cxt, String beanId, String classPath, Map<String, Object> pvs){
  BeanDefinition bdef = new GenericBeanDefinition() ;
  bdef.setBeanClassName(classPath) ;
  for (String p : pvs.keySet()) {
   bdef.getPropertyValues().add(p, pvs.get(p)) ;
  }
  DefaultListableBeanFactory fty = (DefaultListableBeanFactory) cxt.getAutowireCapableBeanFactory() ;
  fty.registerBeanDefinition(beanId, bdef) ;
 }

/**
  * 动态注销bean
  * @param cxt spring context
  * @param beanId
  */
 public void destory(ApplicationContext cxt, String beanId){
  DefaultListableBeanFactory fty = (DefaultListableBeanFactory) cxt.getAutowireCapableBeanFactory() ;
  if(fty.containsBean(beanId)) {
   fty.removeBeanDefinition(beanId);
  }
 }

/**
  * 获取bean
  * @param context spring context
  * @param beanId
  */
 public Object get(ApplicationContext cxt, String beanId){
  try {
   return cxt.getBean(beanId) ;
  } catch (Exception e) {
   //e.printStackTrace() ;
   return null ;
  }
 }

 

//使用

//获取一个service来

　String beanId = "xxxBeanServiceId" ;

    ApplicationContext cxt = WebApplicationContextUtils.getWebApplicationContext(ServletActionContext.getServletContext()) ;
    Object obj = get(cxt, beanId) ;
    if( obj == null ){
     Map<String, Object> pvs = new HashMap<String, Object>() ; 
     pvs.put("xxService", xxService) ; //需要相应的set方法
     pvs.put("xxxxxstring", "xxxxxxxxxxxxxxxxxxxxxxx") ;//需要相应的set方法
     reg(cxt, beanId, cn.com.xx.xxxBeanServiceImpl/*service的实现类*/, pvs) ;
    }
    obj = get(cxt, beanId) ;
    if( obj == null || !(obj instanceof xxxBeanService/*service接口*/) ){
     setErrMsg("未能获取xxxBeanService") ;
     return ERROR ;
    }