dwr 入门例子

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第一步下载dwr http://directwebremoting.org/dwr/index.html
第二步修改web.xml文件
        <servlet>
<servlet-name>dwr-invoker</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-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping

第三步
   在WEB_INF 下面添加 dwr.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd">
<dwr>
<allow>
  <create creator="new" javascript="userService">
   <param name="class"
    value="com.launch.x431.web.action.website.register.UserSearch" />
  </create>
</allow>
</dwr>

第四步 class 文件

package com.launch.x431.web.action.website.register;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.launch.x431.business.bizmanage.bizbean.BizManageFacade;

public class UserSearch {
protected static Log log = LogFactory.getLog(UserSearch.class);

private static BizManageFacade biz = BizManageFacade.getSysManageFacade();

public boolean getUserByUserName(String userName) {
  boolean found = false;
  found = biz.isUserExists(userName);
  log.error("username " + userName + " found " + found);
  return found;
}

}

第五步编写jsp 文件

导入文件
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

<html>
<head>

<title>My JSP 'index.jsp' starting page</title>

</head>
function checkUser(){
    var userName= document.getElementById("userName").value;
    userService.getUserByUserName(userName,callBackReturn);
   }
   function callBackReturn(data){

    if(data==false){
    document.getElementById("result").innerHTML ="user'name can use";
    }else{


    document.getElementById("result").innerHTML ="this name repeat";
    }
   }


<body>
<input type="text"   name="userName" id="userName" onblur="checkUser();"/>