DWR使用實例

DWR使用實例

原創

2020-06-24 21:14

1.創建一個Web Project項目，向WEB-INF/lib/目錄包裏面導入dwr.jar

2.修改web.xml文件：

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <listener> <listener-class>org.directwebremoting.servlet.DwrListener</listener-class> </listener> <servlet>  <servlet-name>dwr</servlet-name> <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>  <init-param> <param-name>debug</param-name> <param-value>true</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>dwr</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>

3.創建一個DwrService.java類

package com.yjpeng.dwr; public class DwrService { public String sayHello(String message){ return "歡迎使用DWR" + message; } }

4.在WEB-INF目錄下創建一個dwr.xml文件

<?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" scope="application"> <param name="class" value="com.yjpeng.dwr.DwrService"></param> </create> </allow> </dwr>

5.修改index.jsp文件代碼

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <script src="dwr/interface/dwrService.js"></script> <script src="dwr/engine.js" ></script> <script type="text/javascript"> function aa(){ dwrService.sayHello("assd", bb); } function bb(data){ document.getElementById("message").value = data; } </script> </head> <body> <input type="text" id="message"/> <input type="button" value="callDwr" οnclick="aa();" /> </body> </html>

6.把web項目部署到服務器中，在瀏覽器中輸入相應的URL。最後測試成功會在文本框裏面出現 “assd” 字符串。

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