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第1关：数据清洗

测试说明
平台会对你编写的代码进行测试：

评测之前先在命令行启动hadoop：start-all.sh；

点击测评后MySQL所需的数据库和表会自动创建好。

PhoneLog：封装对象
LogMR：MapReduce操作
DBHelper：MySQL工具类

具体本关的预期输出请查看右侧测试集。

因为大数据实训消耗资源较大，且map/reduce运行比较耗时，所以评测时间较长，大概在60秒左右，请耐心等待。

在该箭头所指的位置进行代码文件的切换。

代码文件如下：
LogMR类

package com;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
public class LogMR {/********** begin **********/static class MyMapper extends Mapper<LongWritable, Text, PhoneLog, NullWritable> {Map<String, String> userMap = new HashMap<>();Map<String, String> addressMap = new HashMap<>();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");PhoneLog pl = new PhoneLog();Text text = new Text();@Overrideprotected void setup(Context context) throws IOException, InterruptedException {Connection connection = DBHelper.getConnection();try {Statement statement = connection.createStatement();String sql = "select * from userphone";ResultSet resultSet = statement.executeQuery(sql);while (resultSet.next()) {String phone = resultSet.getString(2);String trueName = resultSet.getString(3);userMap.put(phone, trueName);}String sql2 = "select * from allregion";ResultSet resultSetA = statement.executeQuery(sql2);while (resultSetA.next()) {String phone = resultSetA.getString(2);String trueName = resultSetA.getString(3);addressMap.put(phone, trueName);}} catch (SQLException e) {e.printStackTrace();}}@Overrideprotected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {String str = value.toString();String[] split = str.split(",");if (split.length == 6) {String trueName1 = userMap.get(split[0]);String trueName2 = userMap.get(split[1]);String address1 = addressMap.get(split[4]);String address2 = addressMap.get(split[5]);long startTimestamp = Long.parseLong(split[2]);String startTime = sdf.format(startTimestamp * 1000);long endTimestamp = Long.parseLong(split[3]);String endTime = sdf.format(endTimestamp * 1000);long timeLen = endTimestamp - startTimestamp;pl.SetPhoneLog(trueName1, trueName2, split[0], split[1], startTime, endTime, timeLen, address1,address2);context.write(pl, NullWritable.get());}}}public static void main(String[] args) throws Exception {Configuration conf = new Configuration();Job job = Job.getInstance(conf);job.setJarByClass(LogMR.class);job.setMapperClass(MyMapper.class);job.setMapOutputKeyClass(PhoneLog.class);job.setMapOutputValueClass(NullWritable.class);job.setNumReduceTasks(0);Path inPath = new Path("/user/test/input/a.txt");Path out = new Path("/user/test/output");FileInputFormat.setInputPaths(job, inPath);FileOutputFormat.setOutputPath(job, out);job.waitForCompletion(true);}/********** end **********/
}

DBHelper类

package com;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBHelper {/********** begin **********/private static final String driver = "com.mysql.jdbc.Driver";private static final String url = "jdbc:mysql://localhost:3306/mydb?useUnicode=true&characterEncoding=UTF-8";private static final String username = "root";// 数据库的用户名private static final String password = "123123";// 数据库的密码:这个是自己安装数据库的时候设置的，每个人不同。private static Connection conn = null; // 声明数据库连接对象static {try {Class.forName(driver);} catch (Exception ex) {ex.printStackTrace();}}public static Connection getConnection() {if (conn == null) {try {conn = DriverManager.getConnection(url, username, password);} catch (SQLException e) {e.printStackTrace();} // 连接数据库return conn;}return conn;}/********** end **********/
}

PhoneLog类

package com;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
public class PhoneLog implements WritableComparable<PhoneLog> {private String userA;private String userB;private String userA_Phone;private String userB_Phone;private String startTime;private String endTime;private Long timeLen;private String userA_Address;private String userB_Address;public PhoneLog() {}public void SetPhoneLog(String userA, String userB, String userA_Phone, String userB_Phone, String startTime,String endTime, Long timeLen, String userA_Address, String userB_Address) {this.userA = userA;this.userB = userB;this.userA_Phone = userA_Phone;this.userB_Phone = userB_Phone;this.startTime = startTime;this.endTime = endTime;this.timeLen = timeLen;this.userA_Address = userA_Address;this.userB_Address = userB_Address;}public String getUserA_Phone() {return userA_Phone;}public void setUserA_Phone(String userA_Phone) {this.userA_Phone = userA_Phone;}public String getUserB_Phone() {return userB_Phone;}public void setUserB_Phone(String userB_Phone) {this.userB_Phone = userB_Phone;}public String getUserA() {return userA;}public void setUserA(String userA) {this.userA = userA;}public String getUserB() {return userB;}public void setUserB(String userB) {this.userB = userB;}public String getStartTime() {return startTime;}public void setStartTime(String startTime) {this.startTime = startTime;}public String getEndTime() {return endTime;}public void setEndTime(String endTime) {this.endTime = endTime;}public Long getTimeLen() {return timeLen;}public void setTimeLen(Long timeLen) {this.timeLen = timeLen;}public String getUserA_Address() {return userA_Address;}public void setUserA_Address(String userA_Address) {this.userA_Address = userA_Address;}public String getUserB_Address() {return userB_Address;}public void setUserB_Address(String userB_Address) {this.userB_Address = userB_Address;}@Overridepublic void write(DataOutput out) throws IOException {out.writeUTF(userA);out.writeUTF(userB);out.writeUTF(userA_Phone);out.writeUTF(userB_Phone);out.writeUTF(startTime);out.writeUTF(endTime);out.writeLong(timeLen);out.writeUTF(userA_Address);out.writeUTF(userB_Address);}@Overridepublic void readFields(DataInput in) throws IOException {userA = in.readUTF();userB = in.readUTF();userA_Phone = in.readUTF();userB_Phone = in.readUTF();startTime = in.readUTF();endTime = in.readUTF();timeLen = in.readLong();userA_Address = in.readUTF();userB_Address = in.readUTF();}@Overridepublic String toString() {return userA + "," + userB + "," + userA_Phone + "," + userB_Phone + "," + startTime + "," + endTime + ","+ timeLen + "," + userA_Address + "," + userB_Address;}@Overridepublic int compareTo(PhoneLog pl) {if(this.hashCode() == pl.hashCode()) {return 0;}return -1;}
}

之后在命令行启动hadoop

start-all.sh

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