dwr使用:java中DWR的使用方法来源: 发布时间:星期四, 2009年2月12日 浏览:161次 评论:0
1. 导入dwr.jar包; 2. 配置web.xml 如: <?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->org.directwebremoting.servlet.DwrServlet</servlet-> <init-param> <param-name>debug</param-name> <param-value>true</param-value> </init-param> <!-- <init-param> <param-name>crossDoSessionSecurity</param-name> <param-value>false</param-value> </init-param> --> </servlet> <servlet-mapping> <servlet-name>dwr-invoker</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> </web-app> <!-- org.directwebremoting.servlet.DwrServlet 2.X--> <!--uk.ltd.getahead.dwr.DWRServlet 1.X--> 3. 写服务端代码(写类) 如: package com.sk.dwr; public Test { //返回般数据 public String getString(String s){ s+"Hello"; } //返回对象 Public String getUser(String name){ Return User(name); } } 4. 于web.xml同目录下添加并配置dwr.xml 如: <?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>:可以有多个allow标签 <allow>:要暴露给js思路方法,可以有多个 <create creator="" javascript="Hello"> <!—表示无参构造对象,Hello表示出对象句柄,用于在js中 --> <param name="" value="com.sk.dwr.Test"/> <!—name表示类,value指定类完整路径 --> </create> <!-- java思路方法返回对象时,必须指定对象及其要暴露给js属性 --> <convert converter="bean" match="com.sk.dwr.Person"/> <!-- ,用于取对象属性(有几个就写几个) <param name="" value="username,password" /> --> </allow> </dwr> 5. 写HTML(jsp)页面 如: <meta http-equiv="Context-Type" content="text/html; char=UTF-8"> <html > <head> <title>TabContainer Demo</title> <meta http-equiv="Content-Type" content="text/html; char=utf-8"></meta> <script type='text/javascript' src="<%=request.getContextPath%>/dwr/erface/Hello.js"></script> //Hello.js由dwr生成,于要页面,引用Hello.js <script type="text/javascript" src="<%=request.getContextPath%>/dwr/engine.js"></script> <script type="text/javascript" src="<%=request.getContextPath%>/dwr/util.js"></script> <!--//**注意:/dwr红色部分必须和web.xml/dwr部分相同,否则,js报错**--> <script type="text/javascript"> var person; function call { //主调; var nameValue=document.getElementById("name").value; //alert(nameValue); Hello.getString(nameValue,callback); //Hello.getUser(nameValue,callback);//参数1,java思路方法需要参数,参数2,回调,dwr自动把返回数据放入callback参数内! //JDate.toString(callback); } function callback(User) { //回调; DWRUtil.Value("mydiv",User); //若User为ArrayList,则User[i].username //alert(User.password); } </script> </head> <body> <table> <tr> <td>Name:</td> <td><input id="name" type="text"/> <input type="button" value="Read" _disibledevent=> </td> </tr> </table> <div id="mydiv"></div> </body> </html> 0
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