使用Android显示疫情信息

问题描述

　　

 问题分析

　　把数据通过服务器端发布，后由移动端接收数据并显示。

源码

　　python爬虫部分

　　

 1 # author: pjh time: 2020/3/18
 2 # coding=utf-8
 3 import pymysql
 4 import requests
 5 import json
 6 
 7 url = "https://c.m.163.com/ug/api/wuhan/app/data/list-total?t=316765403234"
 8 header = {"user-agent": "Mozilla/5.0 (Linux; Android 8.0.0; Pixel 2 XL Build/OPD1.170816.004) AppleWebKit/537.36 ("
 9                         "KHTML, like Gecko) Chrome/80.0.3987.116 Mobile Safari/537.36"}
10 response = requests.get(url, headers=header)
11 mydir = json.loads(response.content.decode())
12 # 数据库的连接
13 db = pymysql.connect(host='localhost', port=3306, user='root', passwd='123456', db='yiqing', charset='utf8')
14 # 使用cursor方法创建一个游标
15 cursor = db.cursor()
16 for item in mydir['data']['areaTree']:
17     name = item['name']
18     confirm = item['total']['confirm']
19     severe = item['total']['severe']
20     heal = item['total']['heal']
21     dead = item['total']['dead']
22     suspect = item['total']['suspect']
23     idcode = item['id']
24     lastUpdateTime = item['lastUpdateTime']
25     # 插入数据
26     # sql = "insert into global(id,name,confirm,suspect,heal,dead,severe,idcode,lastupdatetime) values ({},'{}'," \
27     #       "'{}','{}','{}','{}','{}','{}','{}');".format(
28     #     0, name, confirm, suspect, heal, dead, severe, idcode, lastUpdateTime)
29 
30     # 更新数据
31     sql = "update global set name='{}' confirm='{}',suspect='{}',heal='{}',dead='{}',severe='{}',lastupdatetime='{}'" \
32           " where idcode='{}'".format(name, confirm, suspect, heal, dead, severe, lastUpdateTime, idcode)
33     print(sql)
34     cursor.execute(sql)
35     db.commit()

　　服务器端发布的servlet部分

　　

 1 package com.pjh.servlet;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 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.pjh.DBUtils.DBUtils;
13 
14 /**
15  * Servlet implementation class sendDataServlet
16  */
17 @WebServlet("/sendDataServlet")
18 public class sendDataServlet extends HttpServlet {
19     private static final long serialVersionUID = 1L;
20        
21     /**
22      * @see HttpServlet#HttpServlet()
23      */
24     public sendDataServlet() {
25         super();
26         // TODO Auto-generated constructor stub
27     }
28 
29     /**
30      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
31      */
32     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
33         response.setContentType("text/html;charset=utf-8");
34         request.setCharacterEncoding("utf-8");
35         response.setCharacterEncoding("utf-8");
36         PrintWriter out = response.getWriter();
37         String date = request.getParameter("date");
38         System.out.println(date);
39         String result = DBUtils.queryGlobalLatestDataByDate2(date).toString();
40         out.write(result);
41         out.flush();
42         out.close();
43     }
44 
45     /**
46      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
47      */
48     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
49         // TODO Auto-generated method stub
50         doGet(request, response);
51     }
52 
53 }

　　Android部分的代码

　　在AndroidManifest.xml中添加两句代码用于联网：

1 <uses-permission android:name="android.permission.INTERNET" />
2 android:usesCleartextTraffic="true"

　　activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     android:id="@+id/activity_main"
 7     android:gravity="center_horizontal">
 8 
 9     <EditText
10         android:id="@+id/query_date"
11         android:layout_width="wrap_content"
12         android:layout_height="wrap_content"
13         android:ems="10"
14         android:inputType="textPersonName"
15         android:text=""/>
16     <Button
17         android:id="@+id/send_request"
18         android:layout_width="wrap_content"
19         android:layout_height="wrap_content"
20         android:text="查询"/>
21 
22     <ListView
23         android:layout_width="match_parent"
24         android:layout_height="match_parent">
25 
26         <TextView
27             android:id="@+id/response_data"
28             android:layout_width="match_parent"
29             android:layout_height="wrap_content"
30             />
31     </ListView>
32 </LinearLayout>

　　MainActivity.java

 1 package com.example.yiqing;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.Button;
 8 import android.widget.EditText;
 9 import android.widget.TextView;
10 
11 import java.io.BufferedReader;
12 import java.io.IOException;
13 import java.io.InputStream;
14 import java.io.InputStreamReader;
15 import java.net.HttpURLConnection;
16 import java.net.MalformedURLException;
17 import java.net.ProtocolException;
18 import java.net.URL;
19 
20 public class MainActivity extends AppCompatActivity {
21 
22     private TextView textView;
23     @Override
24     protected void onCreate(Bundle savedInstanceState) {
25         super.onCreate(savedInstanceState);
26         setContentView(R.layout.activity_main);
27         findViewById(R.id.send_request).setOnClickListener(new View.OnClickListener() {
28             @Override
29             public void onClick(View v) {
30                 sendData();
31             }
32         });
33 
34         textView = (TextView) findViewById(R.id.response_data);
35     }
36 
37     private void sendData() {
38         //开启线程，发送请求
39         new Thread(new Runnable() {
40             @Override
41             public void run() {
42                 HttpURLConnection connection = null;
43                 BufferedReader reader = null;
44                 try {
45 //                    EditText editText = findViewById(R.id.query_date);
46 //                    String date = editText.getText().toString();
47                     URL url = new URL("http://10.0.2.2:8086/yiqing/sendDataServlet?date=2020-03-18");
48 //                    URL url = new URL("http://www.163.com");
49                     connection = (HttpURLConnection) url.openConnection();
50                     //设置请求方法
51                     connection.setRequestMethod("GET");
52                     //设置连接超时时间（毫秒）
53                     connection.setConnectTimeout(5000);
54                     //设置读取超时时间（毫秒）
55                     connection.setReadTimeout(5000);
56 
57                     //返回输入流
58                     InputStream in = connection.getInputStream();
59 
60                     //读取输入流
61                     reader = new BufferedReader(new InputStreamReader(in));
62                     StringBuilder result = new StringBuilder();
63                     String line;
64                     while ((line = reader.readLine()) != null) {
65                         result.append(line);
66                     }
67                     show(result.toString());
68                 } catch (MalformedURLException e) {
69                     e.printStackTrace();
70                 } catch (ProtocolException e) {
71                     e.printStackTrace();
72                 } catch (IOException e) {
73                     e.printStackTrace();
74                 } finally {
75                     if (reader != null) {
76                         try {
77                             reader.close();
78                         } catch (IOException e) {
79                             e.printStackTrace();
80                         }
81                     }
82                     if (connection != null) {//关闭连接
83                         connection.disconnect();
84                     }
85                 }
86             }
87         }).start();
88 
89     }
90 
91     private void show(final String result) {
92         runOnUiThread(new Runnable() {
93             @Override
94             public void run() {
95                     textView.setText(result);
96             }
97         });
98     }
99 }