Ajax传数据到servlet

//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);
    }

}

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原文地址：https://www.cnblogs.com/lusufei/p/7259595.html