//jsp代码
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <!-- //-->
</script>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
<script type="text/javascript" src="script/jquery-1.7.2.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title> <script type="text/javascript">
$(function() {
$(":text").change(function() {
alert(1111);
var url = "testServlet";
$.post(url, {"func" : "getNameAndTime"}, function(data) { alert(data.name); },"json");
}); });
</script>
</head>
<body> <input type="text"/> </body>
</html>
testServlet
package com.javaweb; import java.io.IOException;
import java.util.HashMap;
import java.util.Map; 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 com.google.gson.Gson; /**
* Servlet implementation class TestServlet
*/
@WebServlet("/testServlet")
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public TestServlet() {
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
doPost(request, response);
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String str = request.getParameter("func");
System.out.println(str);
// request.setAttribute("name", 8);
Map<String, Object> result = new HashMap<String, Object>();
result.put("name", "name"); Gson gson = new Gson();//需导入gson.jar
String jsonStr = gson.toJson(result);
response.setContentType("text/javascript");
response.getWriter().print(jsonStr);
} }