第1关：MapReduce综合应用案例 — 电信数据清洗

根据提示，在右侧编辑器补充代码，对数据按照一定规则进行清洗。

数据说明如下： a.txt

数据切分方式：,

数据所在位置：/user/test/input/a.txt

15733218050,15778423030,1542457633,1542457678,450000,530000

Mysql数据库:

用户名：root 密码：123123

数据库名：mydb

用户表：userphone

地址省份表：allregion

清洗规则：

• 处理数据中的时间戳（秒级）将其转化为2017-06-21 07:01:58，年-月-日 时:分:秒 这种格式；

• 处理数据中的省份编码，结合mysql的表数据对应，将其转换成省份名称；

• 处理用户手机号，与mysql的表数据对应，关联用户的真实姓名；

• 处理数据中的开始时间与结束时间并计算通信时长(以秒为单位)；

• 设置数据来源文件路径及清洗后的数据存储路径： 数据来源路径为： /user/test/input/a.txt （HDFS）； 清洗后的数据存放于：/user/test/output (HDFS)。

数据清洗后如下：

邓二,张倩,13666666666,15151889601,2018-03-29 10:58:12,2018-03-29 10:58:42,30,黑龙江省,上海市

step/com/LogMR.java

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 {Map userMap = new HashMap();Map 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 **********/}

step/com/DBHelper.java

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 **********/}

step/com/phonelog.java

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 {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;} @Override public int compareTo(PhoneLog pl) { if(this.hashCode() == pl.hashCode()) { return 0; } return -1; }}

最后重启hadoop#start-all.sh 完成评测