1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <%@page import="com.Bean.*"%>
4 <%@page import="java.util.List"%>
5 <!DOCTYPE html>
6 <html lang="en">
7 <head>
8 <meta charset="UTF-8">
9 <meta name="viewport" content="width=device-width, initial-scale=1.0">
10 <title>疫情地图展示</title>
11 <style>
12 #myEcharts {
13 width: 800px;
14 height: 600px;
15 border: solid 1px red;
16 margin: 0 auto;
17 }
18 </style>
19 <!-- 引入 echarts.js 直接在Echarts 网站找到的线上的js文件 不需要下载 下面一样 -->
20 <script src="https://www.echartsjs.com/examples/vendors/echarts/echarts.min.js?_v_=1578305236132"></script>
21 <!--引入中国的地图数据js文件，引入后会自动注册地图名字和数据-->
22 <script src="https://www.echartsjs.com/examples/vendors/echarts/map/js/world.js?_v_=1584687926098"></script>
23 <script type="text/javascript" src="js/jquery-3.4.1.min.js"></script>
24 </head>
25
26 <body>
27
28
29
30
31 <!--为echarts准备一个dom容器-->
32 <div id="myEcharts"></div>
33 <script>
34
35 var myChart = echarts.init(document.getElementById(‘myEcharts‘));
36 option = {
37 title:{
38 text: ‘全球疫情走势(确诊人数)‘
39 },
40 xAxis: {
41 type: ‘category‘
42
43 },
44 yAxis: {
45 type: ‘value‘,
46
47 },
48 series: [{
49 type: ‘line‘,
50 smooth:true
51 }],
52 };
53 myChart.setOption(option);
54 var times=[];
55 var nums=[];
56 //异步操作获取数据
57 line_url= "${pageContext.request.contextPath }/lineServlet";
58 $.ajax({
59 //url 地址
60 url:line_url,
61 //是否异步 默认为异步
62 async:true,
63 //请求方式，POST/GET
64 type:"POST",
65 data:{"name":"lucy","age":18},
66 //成功响应执行的函数，对应的类型是function类型
67 //用result 操作返回的数据
68 success:function(result){
69 if(result){
70 for(var i=result.length-1;i>=0;i--)
71 {
72 times.push(result[i].data);
73 nums.push(result[i].number);
74 }
75 myChart.setOption({
76 xAxis:{
77 //给x轴赋值
78 data:times
79 },
80 series:[{
81 //y轴
82 data:nums
83 }]
84 });
85 }
86 },
87 //错误响应执行的函数，对应的类型是function类型
88 error:function(msg){
89 alert("数据请求失败");
90 },
91 //服务器端返回的数据类型，常用text和json 请求的Servlet 必须返回json 类型的数据才可以
92 dataType:"json"
93 });
94 </script>
95 </body>
96
97 </html>
1 package com.Servlet;
2
3 import java.io.IOException;
4 import java.util.List;
5
6 import javax.servlet.ServletException;
7 import javax.servlet.annotation.WebServlet;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11
12 import com.Bean.line;
13 import com.Dao.Dao;
14 import com.google.gson.Gson;
15
16 /**
17 * Servlet implementation class lineServlet
18 */
19 @WebServlet("/lineServlet")
20 public class lineServlet extends HttpServlet {
21 private static final long serialVersionUID = 1L;
22
23 /**
24 * @see HttpServlet#HttpServlet()
25 */
26 public lineServlet() {
27 super();
28 // TODO Auto-generated constructor stub
29 }
30
31 /**
32 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
33 */
34 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
35 // TODO Auto-generated method stub
36 response.setContentType("text/html;charset=UTF-8");
37 request.setCharacterEncoding("UTF-8");
38 String data=null;
39 String date = request.getParameter("name");
40 String age =request.getParameter("age");
41 System.out.println(age+date);
42 // Gson 谷歌推出的用于生成和解析JSON 数据格式的工具 使用时需要 导入jar 包 我的是 gson-2.6.2.jar
43 Gson gson=new Gson();
44 try {
45 List<line> list=Dao.getline(); //返回的是类型为line 的list
46 data=gson.toJson(list);
47 } catch (Exception e) {
48 // TODO Auto-generated catch block
49 e.printStackTrace();
50 }
51 //System.out.println(data);
52 response.getWriter().write(data);
53 }
54
55 /**
56 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
57 */
58 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
59 // TODO Auto-generated method stub
60 doGet(request, response);
61 }
62
63 }
在ajax 当中调用的 result[i].data 和 result[i].number 与bean 类当中的line.java 有关 。
json 类似 key-value 的key 就是line.java 定义的类型
原文地址：https://www.cnblogs.com/cxy0210/p/12639195.html
时间： 2024-08-11 13:11:41