采用dwr，让JS调用Java类中方法_dwr js调用-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangjijiang121/article/details/5757708

本文详细介绍了如何使用DWR框架实现Java服务器与JavaScript客户端之间的交互，包括配置web.xml和dwr.xml文件，创建Java服务类及JSP页面，并提供了完整的示例代码。

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步骤如下：

1、配置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>dwrServlet</servlet-name> <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>dwrServlet</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>

2、配置dwr.xml

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd"> <dwr>  <allow>  <create javascript="user" creator="new">  <param name="class" value="cn.com.wlz.server.UserServer"> </param>   </create>  <convert match="cn.com.wlz.vo.User" converter="bean"></convert> </allow> </dwr>

3.java类

package cn.com.wlz.server; import cn.com.wlz.vo.User; public class UserServer { //判断用户是否可用 public int isUser( String name ){ System.out.println( "name:"+name ); if(name.equals( "wlz" )) return 1; return 0; } // //用户注册 public int register( User user ){ System.out.println( "username:"+user.getUsername()+"password:"+user.getPassword()); if( user.getUsername().equals( "wlz" ) ) return 0; return 1; } }

package cn.com.wlz.vo; public class User { private String username; private String password; public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } }

4、jsp代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% 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>  <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type="text/javascript" src="<%=path%></mce:script>  <mce:script type="text/javascript" src="<%=path%></mce:script> </head> <mce:script type="text/javascript"></mce:script> <body> <center> 用户名： <input name="username" onblur="isUser(this.value)" /> <br> 密码： <input name="password" /> <br> <input type="button" name="register" onclick="register()" value="register" /> </body> </html>

5、dwr2.jar下载