一dwr例子

本文提供了一个使用DWR(Direct Web Remoting)实现前后端交互的示例,包括Java代码、HTML页面和DWR配置,展示了如何在网页中通过JavaScript触发后端方法并接收响应。

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HelloTest.java:
package com.zengjinliang.test;

public class HelloTest {

public String sayHello(String str){
System.out.println("name===" + str);
return "后台返回 Hello: " + str;
}
}

index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>DWR Demo1</title>
<script src='dwr/interface/helloTest.js'></script>
<script src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
</head>
<script language="javascript">
function showName(){
var name = document.getElementById("name");
var name = $("name").value;
if(name==""){
alert("请输入名字!");
return;
}
helloTest.sayHello(name,callBack);
}

function callBack(data){
alert(data);
///DWRUtil.setValue("show_name",data,{escapeHtml:false}); //转义
dwr.util.setValue("show_name",data,{escapeHtml:false});
}
</script>
<body>
<form action="index.jsp">
<input type="text" id="name">
<input type="button" value="提交"
onclick="showName();">
<div id="show_name"></div>
<br>
</form>
</body>
</html>

dwr.xml:
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr//dwr20.dtd">
<dwr>
<allow>
<create creator="new" javascript="helloTest" scope="application">
<param name="class" value="com.zengjinliang.test.HelloTest" />
</create>
</allow>
</dwr>

web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<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>
<init-param>
<param-name>classes</param-name>
<param-value>java.lang.Object</param-value>
</init-param>
<init-param>
<param-name>logLevel</param-name>
<param-value>INFO</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

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