• 全球疫情爬取APP版


    全球疫情统计APP图表展示:

    将该任务分解成三部分来逐个实现:

    ①爬取全球的疫情数据存储到云服务器的MySQL上

    ②在web项目里添加一个servlet,通过参数的传递得到对应的json数据

    ③设计AndroidAPP,通过时间和地名来访问服务器上的对应的servlet来获取json数据,然后将它与图表联系

    第一步:由前面的web项目的积累,爬取全球的数据就很容易,利用Python爬虫爬取丁香医生上的数据,存储到服务器上的MySQL

    from os import path
    import requests
    from bs4 import BeautifulSoup
    import json
    import pymysql
    import numpy as np
    import time

    url = 'https://ncov.dxy.cn/ncovh5/view/pneumonia?from=timeline&isappinstalled=0'  #请求地址
    headers = {'user-agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36'}#创建头部信息
    response =  requests.get(url,headers = headers)  #发送网络请求
    #print(response.content.decode('utf-8'))#以字节流形式打印网页源码
    content = response.content.decode('utf-8')

    soup = BeautifulSoup(content, 'html.parser')
    listB = soup.find_all(name='script',attrs={"id":"getListByCountryTypeService2true"})
    world_messages = str(listB)[95:-21]
    world_messages_json = json.loads(world_messages)
    # print(listB)
    # print(world_messages)
    worldList = []
    for k in range(len(world_messages_json)):
        worldvalue = (world_messages_json[k].get('id'),time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time())),
                 world_messages_json[k].get('continents'),world_messages_json[k].get('provinceName'),
                 world_messages_json[k].get('cityName'),world_messages_json[k].get('currentConfirmedCount'),
                 world_messages_json[k].get('suspectedCount'),world_messages_json[k].get('curedCount'),world_messages_json[k].get('deadCount'),world_messages_json[k].get('locationId'),
                 world_messages_json[k].get('countryShortCode'),)
        worldList.append(worldvalue)
    db = pymysql.connect("139.129.221.11", "root", "fengge666", "yiqing", charset='utf8')
    cursor = db.cursor()
    #sql_clean_world = "TRUNCATE TABLE world_map"
    sql_world = "INSERT INTO world_map values (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)"
    worldTuple = tuple(worldList)

    #
    # try:
    #     cursor.execute(sql_clean_world)
    #     db.commit()
    # except:
    #     print('执行失败,进入回调1')
    #     db.rollback()

    try:
        cursor.executemany(sql_world,worldTuple)
        db.commit()
    except:
        print('执行失败,进入回调3')
        db.rollback()

    db.close()
     

    第二步:在之前的web项目里增加一个worldServlet来通过传递过来的参数(时间,地名)来获取服务器里数据库的信息,然后以json的数据格式返回。

     

    package servlet; import java.io.IOException; 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.google.gson.Gson; import Bean.World; import Dao.predao; /** * Servlet implementation class worldServlet */ @WebServlet("/worldServlet") public class worldServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public worldServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); response.setCharacterEncoding("utf-8"); String date=request.getParameter("date"); String name=request.getParameter("name"); //System.out.println("666:"+date+" "+name); predao dao=new predao(); World bean=dao.findworld(date,name); //if(bean==null) // System.out.println("world为空"); Gson gson = new Gson(); String json = gson.toJson(bean); response.getWriter().write(json); //System.out.println(json); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
     

    第三步:Android端的设计,也要细分成两部分。第一部分设计界面的样式以及图表的展示,第二部分就是实现Android端访问远程服务器里的数据获取对应的信息,然后再配置到Android的图表里。

    第一部分实现界面的设计,以及图表。

    <?xml version="1.0" encoding="utf-8"?>
    <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app
    ="http://schemas.android.com/apk/res-auto"
        xmlns:tools
    ="http://schemas.android.com/tools"
        android:layout_width
    ="match_parent"
        android:layout_height
    ="match_parent"
        tools:context
    =".MainActivity">


       
    <TextView
           
    android:id="@+id/tv_time"
            android:layout_width
    ="wrap_content"
            android:layout_height
    ="wrap_content"
            android:layout_marginStart
    ="16dp"
            android:layout_marginLeft
    ="16dp"
            android:layout_marginTop
    ="16dp"
            android:text
    ="时间"
            android:textSize
    ="25dp"
            app:layout_constraintStart_toStartOf
    ="parent"
            app:layout_constraintTop_toTopOf
    ="parent"/>

       
    <EditText
           
    android:id="@+id/et_time"
            android:layout_width
    ="250dp"
            android:layout_height
    ="46dp"
            android:layout_marginEnd
    ="100dp"
            android:layout_marginRight
    ="100dp"
            android:gravity
    ="center"
            app:layout_constraintEnd_toEndOf
    ="parent"
            app:layout_constraintTop_toTopOf
    ="@+id/tv_time"/>

       
    <TextView
           
    android:id="@+id/tv_name"
            android:layout_width
    ="wrap_content"
            android:layout_height
    ="wrap_content"
            android:layout_marginBottom
    ="99dp"
            android:paddingTop
    ="110dp"
            android:text
    ="国家名"
            android:textSize
    ="25dp"
            app:layout_constraintBottom_toTopOf
    ="@+id/chartshow_wb"
            app:layout_constraintStart_toStartOf
    ="parent"
            app:layout_constraintTop_toTopOf
    ="parent"/>

       
    <EditText
           
    android:id="@+id/et_name"
            android:layout_width
    ="250dp"
            android:layout_height
    ="60dp"

            android:gravity
    ="center"
            android:paddingLeft
    ="120dp"
            app:layout_constraintBottom_toBottomOf
    ="@+id/bt_ly"
            app:layout_constraintEnd_toEndOf
    ="parent"
            app:layout_constraintStart_toStartOf
    ="@+id/bt_ly"
            app:layout_constraintTop_toTopOf
    ="@+id/tv_time"/>


       
    <LinearLayout
           
    android:id="@+id/bt_ly"
            android:layout_width
    ="409dp"
            android:layout_height
    ="209dp"
            android:layout_marginTop
    ="16dp"
            android:gravity
    ="center_horizontal"
            android:paddingTop
    ="150dp"
            app:layout_constraintEnd_toEndOf
    ="parent"
            app:layout_constraintHorizontal_bias
    ="0.0"
            app:layout_constraintStart_toStartOf
    ="parent"
            app:layout_constraintTop_toTopOf
    ="parent">

           
    <Button
               
    android:id="@+id/linechart_bt"
                style
    ="?android:attr/buttonStyleSmall"
                android:layout_width
    ="match_parent"
                android:layout_height
    ="wrap_content"
                android:layout_weight
    ="1"
                android:text
    ="折线图"/>

           
    <Button
               
    android:id="@+id/barchart_bt"
                style
    ="?android:attr/buttonStyleSmall"
                android:layout_width
    ="match_parent"
                android:layout_height
    ="wrap_content"
                android:layout_weight
    ="1"
                android:text
    ="柱状图"/>

           
    <Button
               
    android:id="@+id/piechart_bt"
                style
    ="?android:attr/buttonStyleSmall"
                android:layout_width
    ="match_parent"
                android:layout_height
    ="wrap_content"
                android:layout_weight
    ="1"
                android:text
    ="饼状图"/>
       
    </LinearLayout>

       
    <WebView
           
    android:id="@+id/chartshow_wb"
            android:layout_width
    ="408dp"
            android:layout_height
    ="0dp"
            android:layout_gravity
    ="center"
            android:layout_marginBottom
    ="4dp"
            app:layout_constraintBottom_toBottomOf
    ="parent"
            app:layout_constraintEnd_toEndOf
    ="parent"
            app:layout_constraintStart_toStartOf
    ="parent"
            app:layout_constraintTop_toBottomOf
    ="@+id/tv_name">

       
    </WebView>
    </androidx.constraintlayout.widget.ConstraintLayout>

    界面有三部分组成:其一是时间选择框和地名选择,其二就是三个按钮(折线,柱状,圆饼),其三就是webview来展示我们的图表界面

    图表的设计,首先要将echart.min.js放在AndroidStudio里的assets里,然后再放入自己的图表html代码,通过json数据来给图表进行赋值。同样在主页面对webview进行一堆设置,允许运行脚本,设置它的loadURL,然后设计三个按钮的点击方式,同时启动不同的脚本。

    <!DOCTYPE html>
    <!-- release v4.3.6, copyright 2014 - 2017 Kartik Visweswaran -->
    <html lang="en">
    <head>
       
    <meta charset="UTF-8"/>
       
    <title>Android使用Echarts示例</title>


    </head>

    <body>
    <div id="main" style=" 100%; height: 350px;"></div>
    <script src="./echarts.min.js"></script>
    <script type="text/javascript">
    window.addEventListener(
    "resize",function(){
           option.chart.resize();
    });
       
    //初始化路径
       
    var myChart;

       
    //  通用属性定义
       
    var options = {
                    title : {
                        text :
    "Echart测试"
                    },
                    tooltip : {
                        show :
    false
                    },
                    toolbox : {
                        show :
    false
                    },
                };


    function doCreatChart(type,jsondata){
           
    // 基于准备好的dom,初始化echarts实例
       
    var myChart = echarts.init(document.getElementById('main'));
       
    if(type=='line'||type=='bar')
            {
               
    // 指定图表的配置项和数据
                options = {
                    title: {
                        text:
    '人数'
                    },
                    tooltip: {},
                    legend: {
                        data:[
    '疫情状况']
                    },
                    xAxis: {
                        data: [
    "确诊","疑似","治愈","死亡"]
                    },
                    yAxis: {},
                    series: [{
                        name:
    '患者数',
                        type: type,
                        data: jsondata
                    }]
                };
            }
    else{
               options
    = {
                series : [
                    {
                        type:type,
                        radius :
    '55%',
                        center: [
    '50%', '60%'],
                        data:[
                            {value:
    335, name:'确诊'},
                            {value:
    310, name:'疑似'},
                            {value:
    234, name:'治愈'},
                            {value:
    135, name:'死亡'}
                        ]
                    }
                ]
                };
            }

           
    // 使用刚指定的配置项和数据显示图表。
            myChart.setOption(options);

            }
       
    </script>
    </body>

    </html>

    第二部分就是通过Android端的http访问来获取服务器端的json数据,在将该数据传到图表的数据格式里。

    MainActivity

     

    制作中遇到的困难以及解决方案:

    ①远程数据库的连接无法访问,发现自己的服务器3306端口未开放同时要对服务器里的mysql里的一些东西进行配置:我参考的博客是-->远程连接数据库

    ②本来想的是进行jdbc访问远程数据库,奈何整了大半天硬是连不上,最终换了一种方式采取http访问服务器里的数据。

    ③安卓新版本默认不允许使用明文网络传输,

    解决办法如下,在AndroidManifest.xml文件的<application标签中,加入一句"android:usesCleartextTraffic="true",允许应用进行明文传输即可。

    或者采用:

    更改 AndroidManifest 的 application 标签下的配置。

    添加 networkSecurityConfig(网络安全配置)。

    android:networkSecurityConfig="@xml/network_security_config"

    network_security_config 文件内容如下:

    <?xml version="1.0" encoding="utf-8"?> <network-security-config> <base-config cleartextTrafficPermitted="true" /> </network-security-config>

     

     
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  • 原文地址:https://www.cnblogs.com/zzmds/p/13085685.html
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