Ajax异步调用servlet--注意路径

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java-web

Servlet Ajax Java JSP Microsoft

--------------jsp--
<%@ 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>
    <base href="<%=basePath%>">
    <script type="text/javascript">
    var xmlHttp;
    function createXMLHttpRequest()
    {
        try{
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch(e)
        {
            try{
                xmlHttp = new XMLHttpRequest();
            }
            catch(e)
            {
                xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
            }
        }
    }

    function startRequest()
    {
        createXMLHttpRequest();
        alert("1111");
        //var url = "http://localhost:8080/ajax/servlet/ajaxServlet?timestamp="+ new Date().getTime() +"&username=pangbo&password=12345";
       var url = "servlet/AjaxServlet?timestamp="+ new Date().getTime() +"&username=pangbo&password=12345";
        xmlHttp.open("GET",url,true);
            xmlHttp.onreadystatechange = handleXMLHttpRequest;
        xmlHttp.send(null);
    }

    function handleXMLHttpRequest()
    {
            if(xmlHttp.readyState==4)
            {
                    if(xmlHttp.status==200)
                    {
                        document.getElementById("hints").style.color="yellow";
                        alert(xmlHttp.responseText);
                    }
            }
    }

    </script>
</head>

<body>
   <%=basePath%>
   <input name="username" value="" type="text"/>
   <input name="password" value="" type="text"/>
   <input name="submit" value="提交" type="button" onclick="startRequest()"/>
   <p id="hints">hello ajax!!</p>
</body>

</html>

--------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">
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

     <servlet>
        <servlet-name>ajaxServlet</servlet-name>
       <servlet-class>com.ac.servlet.AjaxServlet</servlet-class>
     </servlet>

     <servlet-mapping>
       <servlet-name>ajaxServlet</servlet-name>
       <url-pattern>/servlet/AjaxServlet</url-pattern>
     </servlet-mapping>

</web-app>

-----------servlet-----

package com.ac.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AjaxServlet extends HttpServlet{

    public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException
    {
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String responseText = username+"的密码是"+password+"请牢记！！！！";
        System.out.println(responseText);
        PrintWriter out = response.getWriter() ;
        out.println(responseText);
        out.close();
    }
}

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