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读取hive表中的数据进行数据可视化

1，目的

将数据导入到hive中，通过数据分析后将结果存到新的表中，然后读取hive中的数据进行数据可视化。需要项目所需jar包，json文件和js文件以及数据可以关注我的微信公众号****大太阳花花公主，在后台回复hive即可。​​​​​​​

2，hive中的操作

首先将数据上传到HDFS，然后启动hive，如果因为namenode处于安全模式而无法启动hive可参考我的另一篇博文：

“Name node is in safe mode”的解决方法_大太阳花花公主的博客-CSDN博客

2.1创建数据库

create database nybikedb;

2.2，建表并导入数据

注意在创建表之前需要先使用数据库，即use nybikedb;

创建表：

create table tb_trip_06(tripduration int,starttime string,stoptime
string,start_station_id int,start_station_name string,start_station_latitude
double,start_station_longitude double,stop_station_id int,stop_station_name
string,stop_station_latitude double,stop_station_longitude double,bikeid
int,usertype string,birth_year int,gender int) row format delimited fields
terminated by ',';

导入数据：

load data inpath 'hdfs://hadoop:9000/201906.csv' overwrite into table
tb_trip_06;

2.3，提取需要的数据

由于项目需求是分析6月份的30天的骑行数据，并对比每天每小时的骑行数量，因此只需要从源数据中提取日期，小时和骑行数量。

select day(starttime),hour(starttime),count(*) from tb_trip_06 group by
day(starttime),hour(starttime) order by `_c0`,`_c1`;

_c0, _c1, _c2为临时生成的三个字段，分别表示的是day、hour、 count（日期、小时、数量），需注意的是 **_ 是关键字符，如果作为普通字符使用，在外面加上 ` **

2.4，创建新的表并导入上一步所得数据

创建新表：

create table tb_trip_day_hour_count(day int,hour int,counts int)

导入数据： 

insert into tb_trip_day_hour_count selectday(starttime),hour(starttime),
count(*) from tb_trip_06 group byday(starttime),hour(starttime) order by `_c0`,`_c1`;

3，开发web项目

3.1，创建maven的web项目，并导入依赖

创建maven项目后在webapp目录下创建 data （存放china.json和world.json）和 js 文件夹（存放echarts.js、echarts-gl.js和jquery-1.11.0.min.js）

在pom.xml中导入相关依赖，内容如下：

<dependencies>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-jdbc</artifactId>
<version>2.3.6</version>
</dependency>
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-exec</artifactId>
<version>2.3.6</version>
</dependency>
<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>1.8</version>
<scope>system</scope>
<systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.58</version>
</dependency>
</dependencies>

3.2，Util工具包

在util包中新建一个工具类用于与hive数据库连接。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
//获取hive连接
public class HiveDBUtil {
 private static String url="jdbc:hive2://192.168.59.100:10000/nybikedb";        
 private static String user = "root";
 private static String password = "root";
 static {
     try {
        Class.forName("org.apache.hive.jdbc.HiveDriver");        
    } catch (Exception e) {
        e.printStackTrace();
    }
 }
public static Connection getHiveConn() throws SQLException {
    return DriverManager.getConnection(url,user,password);
}
}

3.3，pojo层

DayCount与hive中tb_trip_day_hour_count表对应，用于对应后端数据的封装

public class DayCount {
    private Integer day;
    private Integer hour;
    private Integer counts;
    
    public DayCount() {
        super();    
    }
    public DayCount(Integer day, Integer hour, Integer counts) {
        super();
        this.day = day;
        this.hour = hour;
        this.counts = counts;
    }
    public Integer getDay() {
        return day;
    }
    public void setDay(Integer day) {
        this.day = day;
    }
    public Integer getHour() {
        return hour;
    }
    public void setHour(Integer hour) {
        this.hour = hour;
    }
    public Integer getCounts() {
        return counts;
    }
    public void setCounts(Integer counts) {
        this.counts = counts;
    }
    @Override
    public String toString() {
        return "DayCount [day=" + day + ", hour=" + hour + ", counts=" + counts + "]";
    }
    

}

HourCountVO类对应前端数据的封装 

import java.util.List;
public class HourCountVO {
    private List<Integer> xData;
    private List<DayItem> yData;
    
    public HourCountVO() {
        super();
    }
    public HourCountVO(List<Integer> xData, List<DayItem> yData) {
        super();
        this.xData = xData;
        this.yData = yData;
    }
    public List<Integer> getxData() {
        return xData;
    }
    public void setxData(List<Integer> xData) {
        this.xData = xData;
    }
    public List<DayItem> getyData() {
        return yData;
    }
    public void setyData(List<DayItem> yData) {
        this.yData = yData;
    }
    @Override
    public String toString() {
        return "HourCount [xData=" + xData + ", yData=" + yData + "]";
    }
    
}

DayItem用于封装每天的数据，其中日期day用于图例。

import java.util.List;
public class DayItem {
    private List<Integer> hourData;
    private String dataName;
    
    public DayItem() {
        super();
    }
    public DayItem(List<Integer> hourData, String dataName) {
        super();
        this.hourData = hourData;
        this.dataName = dataName;
    }
    public List<Integer> getHourData() {
        return hourData;
    }
    public void setHourData(List<Integer> hourData) {
        this.hourData = hourData;
    }
    public String getDataName() {
        return dataName;
    }
    public void setDataName(String dataName) {
        this.dataName = dataName;
    }
    @Override
    public String toString() {
        return "DayItem [hourData=" + hourData + ", dataName=" + dataName + "]";
    }    
}

3.4，dao层

在dao包中新建一个TripDao接口

import java.util.List;
import pojo.DayCount;

public interface TripDao {
    List<DayCount> listCountPreHourOfDay();
 
}

在dao.impl包中新建一个类用于实现接口TripDao

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import dao.TripDao;
import pojo.DayCount;
import utils.HiveDBUtil;
public class TripDaoHiveTmpl implements TripDao{
    public List<DayCount> listCountPreHourOfDay(){
        List<DayCount> list = new ArrayList<DayCount>(720);
        String sql="select * from tb_trip_day_hour_count";        
        try {
            //获取连接
            Connection conn = HiveDBUtil.getHiveConn();
            //获取预编译的sql执行对象
            PreparedStatement ps = conn.prepareStatement(sql);
            //执行sql，获取结果
            ResultSet rs = ps.executeQuery();
            while(rs.next()) {
                int day = rs.getInt("day");
                int hour = rs.getInt("hour");
                int counts = rs.getInt("counts");
                DayCount DC = new DayCount(day,hour,counts);
                list.add(DC);
            }            
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;        
    }
}

3.5，service层

在service包中新建一个TripService接口

import pojo.HourCountVO;

public interface TripService {
    HourCountVO findCountPreHourOfDay();

}

在service.impl包中新建一个类用于实现接口TripService

import Service.TripService;
import dao.TripDao;
import dao.impl.TripDaoHiveTmpl;
import pojo.DayCount;
import pojo.DayItem;
import pojo.HourCountVO;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
public class TripServiceImpl implements TripService{
    private TripDao dao=new TripDaoHiveTmpl();
    public HourCountVO findCountPreHourOfDay() {
        HourCountVO vo=new HourCountVO();
        List<DayCount> list=dao.listCountPreHourOfDay();    
        Set<Integer> xDataSet = new TreeSet<Integer>();
        //声明数组，保存每天的DayItem，数组下标=日期-1
        DayItem[] itemArr = new DayItem[31];
        for (DayCount dc : list) {
            xDataSet.add(dc.getHour());
            DayItem item=itemArr[dc.getDay()-1];
            if(item==null) {
                item = new DayItem();
                item.setDataName("6-"+dc.getDay());
                item.setHourData(new ArrayList<Integer>(24));
                itemArr[dc.getDay()-1]=item;
            }
            item.getHourData().add(dc.getCounts());
        }    
        List<DayItem> yDataList = new ArrayList<DayItem>();
        for (DayItem dayItem : itemArr) {
            if(dayItem !=null) {
                yDataList.add(dayItem);
            }
        }
        List<Integer> xData = new ArrayList<Integer>(xDataSet);
        vo.setxData(xData);
        vo.setyData(yDataList);
        return vo;
    }
}

3.6，control层

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.alibaba.fastjson.JSON;
import Service.TripService;
import Service.impl.TripServiceImpl;
import pojo.HourCountVO;

public class TripServlet extends HttpServlet {
    private static final long ServiceVersionUID = 1L;
    private TripService service = new TripServiceImpl();
    
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        HourCountVO vo = service.findCountPreHourOfDay();
        String jsonStr = JSON.toJSONString(vo);
        resp.setContentType("application/json;charset=utf-8");
        resp.getWriter().write(jsonStr);
    }
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) 
            throws ServletException, IOException {
    doGet(req, resp);
    }

}

3.7，配置web.xml

在web.xml中添加如下内容：

  <servlet>
      <servlet-name>TripServlet</servlet-name>
      <servlet-class>control.TripServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>TripServlet</servlet-name>
      <url-pattern>/trip</url-pattern>
  </servlet-mapping>

3.8，html页面

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>骑行数据展示</title>
<script type="text/javascript" src="js/echarts.js"></script>
<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
</head>
<body>
    <div id="main" style="width: 1200px;height: 600px"></div>
    <script type="text/javascript">
        var url = "http://localhost:8080/Nybike/trip";
        $.get(url,function(result){
        var xData = result.xData;
        var yData = result.yData;
        var mySeries = [];
        var myLegend = [];
        for ( var index in yData) {
            var item = yData[index];
            var dataName = item.dataName;//6-1
            var hourData = item.hourData;
            myLegend.push(dataName);
            var obj = {
                name:dataName,
                type:'line',
                data:hourData
            };
        mySeries.push(obj);
        }
        //初始化的内置对象
        var myChart = echarts.init(document.getElementById('main'));
        //指定图表的配置项
        var option = {
            title:{text:'骑行数据显示'},
            tooltip:{},
            legend:{
                bottom:1,
                data:myLegend},
            toolbox: {
                  feature: {
                      magicType: { type: ['line', 'bar'] }}},                 
            xAxis:{
                data:xData},
            yAxis:{},
            series:mySeries,
            color:['#FF6699','#FF3366','#CC0066','#CC3366','#CC3399',
                '#CC33CC','#CC00FF','#990066','#CC99FF','#993399',
                '#666FF','#6699FF','#9966CC','#0099FF','#0066FF',
                '#FFCC00','#CC99090','#CC3300','#CC6633','#CC0000',
                '#33CCCC','#00CC99','#99FF99','#009966','#66CCCC',
                '#00CC00','#009999','#339999','#339999','#CCCC00'],                
            };              
            myChart.setOption(option);
});
</script>
</body>
</html>

4，页面显示

标签： hive hadoop java
本文转载自: https://blog.csdn.net/m0_61466268/article/details/124718809
版权归原作者 大太阳花花公主 所有， 如有侵权，请联系我们删除。
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