dwr spring整合

del 2011-03-18

Ajax,它使浏览器可以为用户提供更为自然的浏览体验,对于j2EEWEB开发人员来说,使用DWR框架可以很简单的使用Ajax技术.

本文以一个DWR+SPRING的实例来说明DWR的使用

1、将dwr.jar放到应用的/WEB-INF/lib目录下

2、配置web.xml,增加如下代码:

代码

<!--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>

3、增中dwr.xml文件

文件内容:

代码

<?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>

creator属性的值可以是new,struts,spring......因为此处是整合spring来做的,所以设置成“spring”,javascript="DWRUser"表示实例转换成javascript语言后以DWRUser命名,前台页面可以通过代码(<scripttype='text/javascript'src='../../dwr/interface/DWRUser.js'></script>)来调用。param元素的name属性值可以是class,beanName等,此处用beanName,value得值是定义在applicationContext.xml中某个bean的id值。

4、创建一个实体bean供DWR转换成js

代码

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;   
 }   
}

5、在applicationContext.xml中配置第4步写的bean

代码

......

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

......

6、在视图页面中调用

先导入以下文,每个文件的功能这里不再详述

代码

<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>

因为我的视图文件是放在/view/user/下,所以这里用了../../返回到根

具体调用:

代码

<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>

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