利用js+ajax在jsp与servlet间进行简单数据交换

直接上代码

jsp

<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Insert title here</title>

<link rel="stylesheet" type="text/css" href="css/css.css">

</head>

<body  onload="load()" >

<br/><br/>

<form action="" name=form1 method="post" >

    <div style="text-align:center; "><font size="4" face="黑体">用户名：</font> <input type="text"  id='text1' name="username" value="" onchange="check1()" onmouseup="check1()" placeholder="Username"/>

    <br/>

    <input type="button" value="登录"  onclick="go()" style= "height:30px;width:150px;background:#0066FF " onclick="show()"/>

    </div>

</form>

</body>

<script>

function go(){

    var xmlhttp;

    name=document.getElementById("text1").value;

      if (window.XMLHttpRequest)

      {

        // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码

        xmlhttp=new XMLHttpRequest();

      }

      else

      {

        // IE6, IE5 浏览器执行代码

        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");

      }

      xmlhttp.onreadystatechange=function()

      {

        if (xmlhttp.readyState==4 && xmlhttp.status==200)

        {

       //  alert(xmlhttp.responseText);//这里获取到的值为servlet反回的响应信息

        take= xmlhttp.getResponseHeader('take');//获取指定Header中的值

         alert(take);

        }

      }

      xmlhttp.open("GET","ttt?name="+name,true);//利用url传参

      xmlhttp.send();

}

</script>

</html>

这种写法还是比较复杂的，如果结合JQury会简洁很多

servlet

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

/**

 * Servlet implementation class ttt

 */

@WebServlet("/ttt")

public class ttt extends HttpServlet {

	private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public ttt() {

        super();

        // TODO Auto-generated constructor stub

    }

	/**

	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		// TODO Auto-generated method stub

		response.getWriter().append("Served at: ").append(request.getContextPath());

		request.setCharacterEncoding("UTF-8");

		String name;

		name=(String)request.getParameter("name");

		PrintWriter out = response.getWriter();

		response.setCharacterEncoding("utf-8");

		response.resetBuffer();//清空原有返回信息

		response.setHeader("take", "666");//添加自定义headler

		out.write(name);//将name写入响应信息

		out.close();

	}

	/**

	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		// TODO Auto-generated method stub

		doGet(request, response);

	}

}

巴特西

利用js+ajax在jsp与servlet间进行简单数据交换

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