全球疫情统计APP图表形式展示

2019/04/10 10:10
阅读数 348

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()
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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);
    }

}
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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>
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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="width: 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>
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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

package com.example.yiqing;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;

import org.json.JSONObject;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Calendar;

public class MainActivity extends Activity implements View.OnClickListener {
    private EditText meditText,etname;
    private Button linechart_bt,barchart_bt,piechart_bt;
    private WebView chartshow_wb;
    private String name;
    private String data;
    private world bean;
    private String[] url;
    private String[] json = {new String()};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        bean=new world();
    }

    private void getJson(final String address) {

        new Thread(new Runnable(){
            @Override
            public void run() {
                HttpURLConnection connection = null;
                try {
                    URL url = new URL(address);
                    Log.d("address",address);
                    connection=(HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(10000);
                    connection.setReadTimeout(5000);
                    connection.connect();
                    int code=connection.getResponseCode();
                    if(code==200){
                        Log.i("accept:","链接成功");
                        InputStream is=connection.getInputStream();
                        String state = getStringFromInputStream(is);
                        JSONObject jsonObject = new JSONObject(state);
                       //String json=jsonObject.toString();
                        bean.setConfirmed(jsonObject.getString("confirmed"));
                        bean.setCured(jsonObject.getString("cured"));
                        bean.setDead(jsonObject.getString("dead"));
                        bean.setSuspected(jsonObject.getString("suspected"));
                        json[0] ="["+bean.getConfirmed()+","+bean.getSuspected()+","+bean.getCured()+","+bean.getDead()+"]";
                        //Log.i(etname.getText().toString(),json[0]);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }finally{
                    if(connection!=null){
                        connection.disconnect();
                    }
                }
            }
        }).start();
    }

    private static String getStringFromInputStream(InputStream is) throws Exception{

        ByteArrayOutputStream baos=new ByteArrayOutputStream();
        byte[] buff=new byte[1024];
        int len=-1;
        while((len=is.read(buff))!=-1){
            baos.write(buff, 0, len);
        }
        is.close();
        String html=baos.toString();
        baos.close();
        return html;
    }


    /**
     * 初始化页面元素
     */
    private void initView(){
        linechart_bt=(Button)findViewById(R.id.linechart_bt);
        barchart_bt=(Button)findViewById(R.id.barchart_bt);
        piechart_bt=(Button)findViewById(R.id.piechart_bt);
        etname=(EditText) findViewById(R.id.et_name);
        meditText=(EditText) findViewById(R.id.et_time);

        meditText.setOnClickListener(this);
        linechart_bt.setOnClickListener(this);
        barchart_bt.setOnClickListener(this);
        piechart_bt.setOnClickListener(this);
        chartshow_wb=(WebView)findViewById(R.id.chartshow_wb);
        //进行webwiev的一堆设置
        //开启本地文件读取(默认为true,不设置也可以)
        chartshow_wb.getSettings().setAllowFileAccess(true);
        //开启脚本支持
        chartshow_wb.getSettings().setJavaScriptEnabled(true);
        chartshow_wb.loadUrl("file:///android_asset/echarts.html");

        name=etname.getText().toString().trim();
        data=meditText.getText().toString().trim();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.et_time:
                Calendar calendar = Calendar.getInstance();
                DatePickerDialog datePickerDialog=new DatePickerDialog(MainActivity.this, new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
                        if(month<10)
                            MainActivity.this.meditText.setText(year + "-" +"0"+(month+1) + "-" + dayOfMonth);
                        else
                            MainActivity.this.meditText.setText(year + "-" + (month+1) + "-" + dayOfMonth);
                    }
                },calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
                datePickerDialog.show();
                break;

            case R.id.linechart_bt:
                url = new String[]{"http://139.129.221.11/yiqing/worldServlet?date="};
                url[0] = url[0] + meditText.getText().toString()+"&name="+etname.getText().toString();
                getJson(url[0]);
                //Log.i("json:",json[0]);
                //String json="["+bean.getConfirmed()+","+bean.getSuspected()+","+bean.getCured()+","+bean.getDead()+"]";
                Log.i("jsonline:",json[0]);
                chartshow_wb.loadUrl("javascript:doCreatChart('line',"+json[0]+");");
                //Toast.makeText(MainActivity.this,"折线图",Toast.LENGTH_SHORT).show();
                break;
            case R.id.barchart_bt:
                url = new String[]{"http://139.129.221.11/yiqing/worldServlet?date="};
                url[0] = url[0] + meditText.getText().toString()+"&name="+etname.getText().toString();
                getJson(url[0]);
                chartshow_wb.loadUrl("javascript:doCreatChart('bar',"+json[0]+");");
                break;
            case R.id.piechart_bt:
                url = new String[]{"http://139.129.221.11/yiqing/worldServlet?date="};
                url[0] = url[0] + meditText.getText().toString()+"&name="+etname.getText().toString();
                getJson(url[0]);
                chartshow_wb.loadUrl("javascript:doCreatChart('pie',"+json[0]+");");
                break;
            default:
                break;
        }
    }

}
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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>

 

原文出处:https://www.cnblogs.com/xiaofengzai/p/12526991.html

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