全国疫情统计可视化（图表）

题目描述

问题分析

　　使用Echarts处理柱形图

源码

　　前台的目录结构

　　构建路径

　　后台的路径

　　后台的代码

 1 package com.pjh.DBUtils;
 2
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.PreparedStatement;
 6 import java.sql.ResultSet;
 7 import java.sql.SQLException;
 8
 9 import net.sf.json.JSONArray;
10 import net.sf.json.JSONObject;
11
12 public class DBUtils {
13
14     private static String URL = "jdbc:mysql://localhost:3306/yiqing?useUnicode=true&characterEncoding=GB18030&useSSL=false&serverTimezone=GMT&allowPublicKeyRetrieval=true";
15     private static String username = "root";
16     private static String password = "123456";
17
18     public static Connection getConnection() {
19         try {
20             Class.forName("com.mysql.cj.jdbc.Driver");
21             return DriverManager.getConnection(URL, username, password);
22         } catch (Exception e) {
23             System.out.println("SQL CONNECTION FAILED!");
24             e.printStackTrace();
25         }
26         return null;
27     }
28
29     public static String queryDataByDate(String date) {
30         Connection connection = null;
31         PreparedStatement preparedStatement = null;
32         ResultSet resultSet = null;
33         JSONArray jsonArray = new JSONArray();
34
35         String province = "";
36         String sql = "select * from info where Date like ‘"+date+"%‘ and  City=‘‘";
37         try {
38             connection = getConnection();
39             preparedStatement = connection.prepareStatement(sql);
40             resultSet = preparedStatement.executeQuery();
41             while (resultSet.next()) {
42                 province += resultSet.getString("Province")+";";
43             }
44             resultSet.close();
45             String string[] = province.split(";");
46             for (int i = 0; i < string.length; i++) {
47                 if (string[i].trim().equals("")) {
48                     continue;
49                 }
50                 sql = "select sum(Confirmed_num),sum(Yisi_num),sum(Cured_num),sum(Dead_num) from info where Date like ‘"
51                         +date+"%‘ and Province=‘"+string[i]+"‘";
52                 preparedStatement = connection.prepareStatement(sql);
53                 resultSet = preparedStatement.executeQuery();
54                 resultSet.next();
55                 JSONObject jsonObject = new JSONObject();
56                 jsonObject.put("name", string[i]);
57                 jsonObject.put("num", resultSet.getInt(1));
58                 jsonObject.put("yisi", resultSet.getString(2));
59                 jsonObject.put("cure", resultSet.getString(3));
60                 jsonObject.put("dead", resultSet.getString(4));
61                 resultSet.close();
62                 sql = "select * from info where Date like ‘"+date+"%‘ and Province=‘"+string[i]+"‘";
63                 preparedStatement = connection.prepareStatement(sql);
64                 resultSet = preparedStatement.executeQuery();
65                 resultSet.next();
66                 jsonObject.put("code", resultSet.getString("Code"));
67                 resultSet.close();
68                 jsonArray.add(jsonObject);
69             }
70             return jsonArray.toString();
71         } catch (SQLException e) {
72             e.printStackTrace();
73             return null;
74         }
75     }
76 }

 1 package com.pjh.servlet;
 2
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9
10 import com.pjh.DBUtils.DBUtils;
11
12 /**
13  * Servlet implementation class queryDataServlet
14  */
15 @WebServlet("/queryDataServlet")
16 public class queryDataServlet extends HttpServlet {
17     private static final long serialVersionUID = 1L;
18
19     /**
20      * @see HttpServlet#HttpServlet()
21      */
22     public queryDataServlet() {
23         super();
24         // TODO Auto-generated constructor stub
25     }
26
27     /**
28      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
29      */
30     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
31         response.getWriter().append("Served at: ").append(request.getContextPath());
32     }
33
34     /**
35      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
36      */
37     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
38         request.setCharacterEncoding("utf-8");
39         response.setContentType("text/html;charset=UTF-8");
40         response.getWriter().write(DBUtils.queryDataByDate(request.getParameter("date")));
41     }
42
43 }

　　前台的代码

  1 <!DOCTYPE html>
  2 <html>
  3 <head>
  4 <meta charset="UTF-8">
  5 <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
  6 <link rel="stylesheet" href="layui/css/layui.css">
  7 <script src="js/echarts.min.js"></script>
  8 <script src="js/jquery.min.js"></script>
  9 <style>
 10             #top {
 11                 width: auto;
 12                 height: 30px;
 13                 text-align: center;
 14                 margin: auto;
 15                 padding-top: 5px;
 16                 background-color: gray;
 17             }
 18         </style>
 19 <title>YiQing</title>
 20 </head>
 21 <body>
 22
 23     <div id="top">
 24             请选择日期：<input type="date" name="date"><button>查询</button>
 25     </div>
 26
 27     <div id="main" style="width: 100%;height:550px;overflow: auto;"></div>
 28     <script type="text/javascript">
 29          var myChart = echarts.init(document.getElementById(‘main‘));
 30          myChart.showLoading();
 31          var names=[];
 32          var nums=[];
 33         $("button").click(function(){
 34             names=[];
 35             nums=[];
 36             $(".head").empty();
 37             $(".main").empty();
 38             $.post(
 39                 ‘http://localhost:8086/yiqing/queryDataServlet‘,
 40                 {"date":$("input[name=date]").val()},
 41                 function(msg){
 42                     var json=JSON.parse(msg);
 43                     var size=json.length;
 44                     for(i=0;i<size;i++){
 45                         names.push(json[i].name);
 46                         nums.push(parseInt(json[i].num));
 47                     }
 48
 49                     myChart.hideLoading();
 50                     var option = {
 51                             title: {
 52                                 text: $("input[name=date]").val()+‘确诊人数‘
 53                             },
 54                             tooltip: {},
 55                             legend: {
 56                                 data:[‘确诊人数‘]
 57                             },
 58                             grid: {
 59                                 y2: 150
 60                             },
 61                             xAxis: {
 62                                 type : ‘category‘,
 63                                 data: names,
 64                                 axisLabel:{
 65                                     interval:0,
 66                                     rotate:-17,
 67                                     }
 68                             },
 69                             yAxis: {},
 70                             series: [{
 71                                 name: ‘确诊人数‘,
 72                                 type: ‘bar‘,
 73                                 data: nums
 74                             }]
 75                         };
 76                     myChart.setOption(option);
 77                     tr="<tr><th>省份</th><th>确诊人数</th><th>疑似人数</th><th>治愈人数</th><th>死亡人数</th><th>编码</th></tr>";
 78                     $(‘.head‘).append(tr);
 79                     for(i=0;i<size;i++)
 80                         $(‘.main‘).append("<tr></tr>");
 81                     $(‘.main tr‘).each(function(i){
 82                         $(this).append("<td>"+json[i].name+"</td>");
 83                         $(this).append("<td>"+json[i].num+"</td>");
 84                         $(this).append("<td>"+json[i].yisi+"</td>");
 85                         $(this).append("<td>"+json[i].cure+"</td>");
 86                         $(this).append("<td>"+json[i].dead+"</td>");
 87                         $(this).append("<td>"+json[i].code+"</td>");
 88                     })
 89                 }
 90
 91             )
 92         })
 93     </script>
 94     <table class="layui-table">
 95         <thead class="head">
 96             </thead>
 97         <tbody class="main"></tbody>
 98     </table>
 99 </body>
100 </html>

结果样例

原文地址：https://www.cnblogs.com/52bb/p/12424021.html