参考了大家问答,3-6自由编程
package com.imooc.ajax; import java.io.IOException; import java.util.ArrayList; import java.util.List; 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.alibaba.fastjson.JSON; /** * Servlet implementation class NewsListServlet */ @WebServlet("/music_list") public class MusicListServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public MusicListServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String type = request.getParameter("t"); List<String> list = new ArrayList<String>(); if(type != null && type.equals("pop")) { list.add("稻香"); list.add("晴天"); list.add("告白气球"); }else if(type != null && type.equals("classic")) { list.add("千千阙歌"); list.add("傻女"); list.add("七友"); }else if(type == null || type.equals("rock")) { list.add("一块红布"); list.add("假行僧"); list.add("新长征路上的摇滚"); } String json = JSON.toJSONString(list); System.out.println(json); response.setContentType("text/html;charset=UTF-8"); response.getWriter().println(json); } }
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>播放列表查看</title> <script type="text/javascript" src="js/jquery-3.4.1.js"></script> <style> #jar input{ width: 100%; } </style> </head> <body> <div id = "jar"> <table style="width:100%"> <tr> <td><input name="song" id="pop" type="button" value="流行歌曲"></td> <td><input name="song" id="classic" type="button" value="经典歌曲"></td> <td><input name="song" id="rock" type="button" value="摇滚歌曲"></td> </tr> </table> </div> <div id="container"></div> <script type="text/javascript"> function SongsFetch(id){ $.ajax({ "url":"/ajax/music_list", "type":"get", "data":{"t":id}, "dataType":"json", "success":function(json){ for(var i=0; i <json.length; i++){ $("#container").append("<h1 style='text-align:center'>"+json[i]+"</h1>"); } } }) } var list = document.getElementsByName("song"); for(var i=0; i<list.length; i++){ var temp = list[i].id; list[i].onclick = function(){ $("#container").empty(); SongsFetch(this.id); } } </script> </body> </html>
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慕田峪1061482
2019-10-21 11:24:13
可以一步一步进行说明一下吗?都是什么?
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