Ajax提交json格式数据-优快云博客

本文链接：https://blog.youkuaiyun.com/HelloKitty520123/article/details/49944575

本文详细介绍了如何在myAjax.jsp页面通过Ajax技术向myAjaxController.java发送JSON格式的数据，接着阐述如何获取用户输入并封装成JSON，接着讨论servlet如何接收并处理这些数据，最后说明servlet如何将处理结果回传给客户端。

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myAjax.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ajax提交数据</title>
</head>
<body>
    <input id="username" type="text">
    <input type="submit" value="提交" onclick="test()">
    <!-- 引入jq类库 -->
    <script type="text/javascript" src="${pageContext.request.contextPath}/resources/scripts/jquery-1.8.3.min.js"></script>
    <!-- ajax提交 -->
    <script type="text/javascript">
        function test(){
            var my_username = $('#username').val();
            var username = {'username': my_username};
            var contextPath = '${pageContext.request.contextPath}';
            alert(username.username);
            $.ajax({ 
                type: "post", 
                url:   contextPath+"/myAjaxController", 
                data:  username,
                dataType: "json",
                success: function(msg){alert( msg );} //操作成功后的操作！msg是后台传过来的值 
                }); 
        }
    </script>

</body>
</html>

myAjaxController.java

package com.hongyewell.ajax;

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;

import com.google.gson.Gson;

public class myAjaxController extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        //接收数据
        request.setCharacterEncoding("utf-8");
        String username = request.getParameter("username");
        System.out.println(username);
        //返回数据
        String flag = "ok";
        PrintWriter out = response.getWriter();
        Gson gson = new Gson();
        String flagJson = gson.toJson(flag);
        out.write(flagJson);

    }

}