流量統計

需求一: 統計求和

統計每個手機號的上行流量總和，下行流量總和，上行總流量之和，下行總流量之和分析：以手機號碼作為key值，上行流量，下行流量，上行總流量，下行總流量四個字段作為value值，然后以這個key，和value作為map階段的輸出，reduce階段的輸入

Step 1: 自定義map的輸出value對象FlowBean

package cn.learn.mapreduce_flowcount;import org.apache.hadoop.io.Writable;import java.io.DataInput; import java.io.DataOutput; import java.io.IOException;public class FlowBean implements Writable {private Integer upFlow;private Integer downFlow;private Integer upCountFlow;private Integer downCountFlow;public Integer getUpFlow() {return upFlow;}public void setUpFlow(Integer upFlow) {this.upFlow = upFlow;}public Integer getDownFlow() {return downFlow;}public void setDownFlow(Integer downFlow) {this.downFlow = downFlow;}public Integer getUpCountFlow() {return upCountFlow;}public void setUpCountFlow(Integer upCountFlow) {this.upCountFlow = upCountFlow;}public Integer getDownCountFlow() {return downCountFlow;}public void setDownCountFlow(Integer downCountFlow) {this.downCountFlow = downCountFlow;}@Overridepublic String toString() {returnupFlow +"\t" + downFlow +"\t" + upCountFlow +"\t" + downCountFlow;}@Overridepublic void write(DataOutput dataOutput) throws IOException {dataOutput.writeInt(upFlow);dataOutput.writeInt(downFlow);dataOutput.writeInt(upCountFlow);dataOutput.writeInt(downCountFlow);}@Overridepublic void readFields(DataInput dataInput) throws IOException {this.upFlow = dataInput.readInt();this.downFlow = dataInput.readInt();this.upCountFlow = dataInput.readInt();this.downCountFlow = dataInput.readInt();} }

Step 2: 定義FlowMapper類

package cn.learn.mapreduce_flowcount;import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper;import java.io.IOException;public class FlowCountMapper extends Mapper<LongWritable,Text,Text,FlowBean> {@Overrideprotected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {//1:拆分手機號String[] split = value.toString().split("\t");String phoneNum = split[1];//2:獲取四個流量字段FlowBean flowBean = new FlowBean();flowBean.setUpFlow(Integer.parseInt(split[6]));flowBean.setDownFlow(Integer.parseInt(split[7]));flowBean.setUpCountFlow(Integer.parseInt(split[8]));flowBean.setDownCountFlow(Integer.parseInt(split[9]));//3:將k2和v2寫入上下文中context.write(new Text(phoneNum), flowBean);} }

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