dwr框架的使用

    dwr是一个ajax框架,在js代码就可以很轻松调用java类的方法,dwr和ajax有什么区别,dwr配置比较多,js写的代码比较少,ajax不需要什么配置,写的代码比较多

    怎么使用dwr框架呢?

    先下载dwr30.jar,common-logging.jar,放在lib下面

    在web-inf下创建一个dwr.xml

    

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"
    "http://getahead.org/dwr/dwr30.dtd">

<dwr>
    <allow>
        <create creator="new" javascript="DWRService">
            <param name="class" value="com.chen.Chen"></param>
        </create>
    </allow>
</dwr>

    creator 用new的方式创建,javaScript表示在js页面用的标识符调用java的函数,param标签指定标识符调用的类

 web.xml中的配置为

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  
  
  <servlet>
      <servlet-name>dwr-invoke</servlet-name>
      <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
      <!-- 配置dwr的debug功能方便测试，发布的时候记得一定删除 -->
      <init-param>
          <param-name>debug</param-name>
          <param-value>true</param-value>
      </init-param>
  </servlet>
  
  <servlet-mapping>
      <servlet-name>dwr-invoke</servlet-name>
      <url-pattern>/dwr/*</url-pattern>
  </servlet-mapping>
  
  

  
  
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

java类

package com.chen;

public class Chen {

    public String getName(String name){
        System.out.println("a");
        return name + "abc";
    }
    
}

页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
  <script type='text/javascript' src='dwr/interface/DWRService.js'></script>
  <script type='text/javascript' src='dwr/engine.js'></script>
  <script type='text/javascript' src='dwr/util.js'></script>

<script>
    
    var callServiceMethod = function(obj){
        // 参数1是需要给 java类方法的参数
        //最后的参数是 回调方法
            DWRService.getName('abc',function(data){
                alert("b")
                alert(data);
            });
        };
    callServiceMethod();
</script>
</head>
<body>
abc
</body>
</html>

 

posted @ 2015-08-13 16:11  如果可以在重来  阅读(548)  评论(0)  编辑  收藏  举报