标签：put tchar image 实验 ring dstat res out import
1 第一阶段目标：
导入全国疫情数据库payiqing.sql（MySQL数据库）。
可以按照时期查询各个省市的疫情统计表格。
以折线图或柱状图展示某天的全国各省的确诊人数。
1.首先完成数据库的导入，然后编写数据库代码。建立DBUtil.java。实现相关数据的查询，并转化为json，以供Echart柱状图获取数据使用。
package dbutil; import java.sql.Connection; import java.sql.Date; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import javabeen.Things; public class DButil { //数据库URL和账号密码 public static final String connectionURL="jdbc:mysql://localhost:3306/keshi?useUnicode=true&characterEncoding=GB18030&useSSL=false&serverTimezone=GMT&allowPublicKeyRetrieval=true"; public static final String username="root"; public static final String password="123456"; static Connection connection; static ResultSet rSet; static PreparedStatement sql; //数据库连接 public static Connection getConnection() { try { Class.forName("com.mysql.cj.jdbc.Driver"); return DriverManager.getConnection(connectionURL, username, password); } catch (Exception e) { // TODO: handle exception System.out.println("数据库连接失败"); e.printStackTrace(); } return null; } public static String search(String date)//查 { try { connection=getConnection(); sql=connection.prepareStatement("select * from info where Date like ‘"+date+"%‘ and City=‘‘"); System.out.println(sql); rSet=sql.executeQuery(); //ArrayList<Things> list =new ArrayList<>(); JSONArray jsonArray=new JSONArray(); while(rSet.next()) { //System.out.println(rSet.getString(3)); JSONObject json=new JSONObject(); json.put("name",rSet.getString(3) ); json.put("num", rSet.getString(5)); json.put("yisi",rSet.getString(6)); json.put("cure", rSet.getString(7)); json.put("dead", rSet.getString(8)); json.put("code", rSet.getString(9)); jsonArray.add(json); } return jsonArray.toString(); } catch (Exception e) { // TODO: handle exception return null; } } // public static void main(String[] args) { // search("2020-02-12"); // } }
2.建立selvlet，接收jsp中的时间数据，并通过调用DBUtil中的方法获取数据并传回到jsp
package selvlet; import java.io.IOException; import java.util.ArrayList; 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.alibaba.fastjson.JSONArray; import dbutil.DButil; import javabeen.Things; /** * Servlet implementation class Selvletsearch */ @WebServlet("/Selvletsearch") public class Selvletsearch extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } /** * @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); request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=UTF-8"); // String date=request.getParameter("date"); response.getWriter().write(DButil.search(request.getParameter("date"))); } }
3.main.jsp 界面，实现柱状图的答印和各个地区疫情情况的数据的表格打印
<%@page import="com.alibaba.fastjson.JSON"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script src="echarts.min.js"></script> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> <style> #one{ /*border: 1px solid black;*/ width: 1000px; height:auto; background-color: ghostwhite; margin: auto; } #main{ width:1000px; height:outo; background-color: ghostwhite; margin: auto; } .table { margin: auto; } </style> </head> <body> <div id="one"> 请输入时间：<input type="text" name="date" id="date" /> <input type="submit" value="查询" onclick="search()"> </div> <br/> <div id="main" style="width: 100%;height:400px;overflow: auto;"></div> <table class="table"> <thead class="head"> </thead> <tbody class="main"></tbody> </table> <script type="text/javascript"> // 基于准备好的dom，初始化echarts实例 var myChart = echarts.init(document.getElementById(‘main‘)); // 指定图表的配置项和数据 myChart.showLoading(); function search() { var date=$("#date").val(); alert("查找成功"); $.post( ‘Selvletsearch‘, {date:date}, function(msg){ var json=JSON.parse(msg); var size=json.length; var names=[]; var nums=[]; for(i=0;i<size;i++){ names.push(json[i].name); nums.push(json[i].num); i++; } myChart.hideLoading(); var option = { title: { text: $("input[name=date]").val()+‘确诊人数‘ }, tooltip: {}, legend: { data:[‘确诊人数‘] }, xAxis: { data: names }, yAxis: {}, series: [{ name: ‘确诊人数‘, type: ‘bar‘, data: nums }] }; myChart.setOption(option); 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>"; $(‘.head‘).append(tr); for(i=0;i<size;i++) $(‘.main‘).append("<tr></tr>"); $(‘.main tr‘).each(function(i){ $(this).append("<td>"+json[i].name+"</td>"); $(this).append("<td>"+json[i].num+"</td>"); $(this).append("<td>"+json[i].yisi+"</td>"); $(this).append("<td>"+json[i].cure+"</td>"); $(this).append("<td>"+json[i].dead+"</td>"); $(this).append("<td>"+json[i].code+"</td>"); }) }, //"json" ); } </script> </body> </html>
实验结果：
标签：put tchar image 实验 ring dstat res out import
原文地址：https://www.cnblogs.com/zwx655/p/12432474.html
