<%@ 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%>"> <title>My JSP 'ajax.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <script type="text/javascript"> var xmlHttpRequest = null; //声明一个空对象以接收XMLHttpRequest对象 function ajaxSubmit() { if(window.ActiveXObject) // IE浏览器 { xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP"); } else if(window.XMLHttpRequest) //除IE外的其他浏览器实现 { xmlHttpRequest = new XMLHttpRequest(); } if(null != xmlHttpRequest) { var v1 = document.getElementById("value1ID").value; var v2 = document.getElementById("value2ID").value; xmlHttpRequest.open("POST", "AjaxServlet", true); //xmlHttpRequest.open("GET", "AjaxServlet?v1="+v1+"&v2="+v2, true); //关联好ajax的回调函数 xmlHttpRequest.onreadystatechange = ajaxCallback; //真正向服务器端发送数据 // 使用post方式提交，必须要加上如下一行,表单默认编码方式 xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xmlHttpRequest.send("v1=" + v1 + "&v2=" + v2); //xmlHttpRequest.send(null); } } function ajaxCallback() { //1.构造对象,2.发送请求,3.收到响应,4.处理响应 if(xmlHttpRequest.readyState == 4) { if(xmlHttpRequest.status == 200) { var responseText = xmlHttpRequest.responseText; document.getElementById("div1").innerHTML = responseText; } } } </script> </head> <body> <input type="button" value="get content from server" onclick="ajaxSubmit();"><br> <input type="text" name="value1" id="value1ID"><br> <input type="text" name="value2" id="value2ID"><br> <div id="div1"></div> </body> </html>
package com.shengsiyuan.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class AjaxServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("doGet invoked"); process(req, resp); } private void process(HttpServletRequest req, HttpServletResponse resp) throws IOException { String v1 = req.getParameter("v1"); String v2 = req.getParameter("v2"); System.out.println("v1=" + v1 + ", v2=" + v2); String v3 = String.valueOf(Integer.valueOf(v1) + Integer.valueOf(v2)); PrintWriter out = resp.getWriter(); // try // { // Thread.sleep(5000); // } // catch (InterruptedException e) // { // e.printStackTrace(); // } resp.setHeader("pragma", "no-cache"); resp.setHeader("cache-control", "no-cache"); out.println(v3); out.flush(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("doPost invoked"); this.process(req, resp); } }