Spring + dwr整合

<!--初始化WebApplicationContext-->  
     <context-param>  
            <param-name>contextConfigLocation</param-name>  
            <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/action-servlet.xml</param-value>  
     </context-param>  
     <listener>  
           <listener-class>  
                 org.springframework.web.context.ContextLoaderListener   
           </listener-class>  
     </listener>  
    <!--配置DWR拦截器-->  
     <servlet>  
      <servlet-name>dwr-invoker</servlet-name>  
      <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>  
      <init-param>  
       <param-name>debug</param-name>  
       <param-value>true</param-value>  
      </init-param>  
     </servlet>  
     <servlet-mapping>  
      <servlet-name>dwr-invoker</servlet-name>  
      <url-pattern>/dwr/*</url-pattern>  
     </servlet-mapping>

<?xml version="1.0" encoding="UTF-8"?>  
    <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">  
    <dwr>  
     <allow>  
      <create creator="spring" javascript="DWRUser">  
       <param name="beanName" value="DWRUser"/>  
      </create>  
     </allow>  
    </dwr>

package com.note.dwr;   
    import com.note.bussies.service.IUserService;   
    public class User {   
     private IUserService ius;   
        
     public IUserService getIus() {   
      return ius;   
     }   
     public void setIus(IUserService ius) {   
      this.ius = ius;   
     }   
     public User(){   
         
     }   
     public boolean isExist(String username) {   
          Users user = this.ius.getUserByName(username);   
          return (null == user) ? false : true;   
     }   
    }

......   
     <bean id="DWRUser" class="com.note.dwr.User">  
      <property name="ius">  
       <ref bean="UserService" />  
      </property>  
     </bean>  
    ......

<script type='text/javascript' src='../../dwr/interface/DWRUser.js'></script>  
    <script type='text/javascript' src='../../dwr/engine.js'></script>  
    <script type='text/javascript' src='../../dwr/util.js'></script>

<script type='text/javascript'>  
     function regUserChked(){   
      var username=$("username").value;   
      DWRUser.isExist(username,showData);//showData回调函数   
     }   
     function showData(data){   
         if(data){   
              DWRUtil.setValue("userMsg","该用户名已经被注册，请更换您的用户名！");   
         }else{   
              DWRUtil.setValue("userMsg","恭喜您，该用户名尚未被注册！");         
         }   
     }   
    </script>  
    input type="text" name="username" value="" onblur="regUserChked()" /><div id="userMsg"></div>