需求
需求分析
FlowBean
// 1 实现writable接口
public class FlowBean implements Writable {
private long upFlow;
private long downFlow;
private long sumFlow;
//2 反序列化时，需要反射调用空参构造函数，所以必须有
public FlowBean() {
super();
}
public FlowBean(long upFlow, long downFlow) {
super();
this.upFlow = upFlow;
this.downFlow = downFlow;
this.sumFlow = upFlow + downFlow;
}
//3 写序列化方法
@Override
public void write(DataOutput out) throws IOException {
out.writeLong(upFlow);
out.writeLong(downFlow);
out.writeLong(sumFlow);
}
//4 反序列化方法
//5 反序列化方法读顺序必须和写序列化方法的写顺序必须一致
@Override
public void readFields(DataInput in) throws IOException {
this.upFlow = in.readLong();
this.downFlow = in.readLong();
this.sumFlow = in.readLong();
}
// 6 编写toString方法，方便后续打印到文本
@Override
public String toString() {
return upFlow + "\t" + downFlow + "\t" + sumFlow;
}
public long getUpFlow() {
return upFlow;
}
public void setUpFlow(long upFlow) {
this.upFlow = upFlow;
}
public long getDownFlow() {
return downFlow;
}
public void setDownFlow(long downFlow) {
this.downFlow = downFlow;
}
public long getSumFlow() {
return sumFlow;
}
public void setSumFlow(long sumFlow) {
this.sumFlow = sumFlow;
}
}
FlowCountMapper
public class FlowCountMapper extends Mapper<LongWritable, Text, Text, FlowBean> {
FlowBean v = new FlowBean();
Text k = new Text();
@Override
protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
// 1 获取一行
String line = value.toString();
// 2 切割字段
String[] fields = line.split("\t");
// 3 封装对象
// 取出手机号码
String phoneNum = fields[1];
// 取出上行流量和下行流量
long upFlow = Long.parseLong(fields[fields.length - 3]);
long downFlow = Long.parseLong(fields[fields.length - 2]);
k.set(phoneNum);
v.setDownFlow(downFlow);
v.setUpFlow(upFlow);
// 4 写出
context.write(k, v);
}
}
FlowCountReducer
public class FlowCountReducer extends Reducer<Text, FlowBean, Text, FlowBean> {
@Override
protected void reduce(Text key, Iterable<FlowBean> values, Context context) throws IOException, InterruptedException {
long sum_upFlow = 0;
long sum_downFlow = 0;
// 1 遍历所用bean，将其中的上行流量，下行流量分别累加
for (FlowBean flowBean : values) {
sum_upFlow += flowBean.getUpFlow();
sum_downFlow += flowBean.getDownFlow();
}
// 2 封装对象
FlowBean resultBean = new FlowBean(sum_upFlow, sum_downFlow);
// 3 写出
context.write(key, resultBean);
}
}
FlowsumDriver
public class FlowsumDriver {
public static void main(String[] args) throws IllegalArgumentException, IOException, ClassNotFoundException, InterruptedException {
// 输入输出路径需要根据自己电脑上实际的输入输出路径设置
args = new String[]{"e:/input/inputflow", "e:/output1"};
// 1 获取配置信息，或者job对象实例
Configuration configuration = new Configuration();
Job job = Job.getInstance(configuration);
// 6 指定本程序的jar包所在的本地路径
job.setJarByClass(FlowsumDriver.class);
// 2 指定本业务job要使用的mapper/Reducer业务类
job.setMapperClass(FlowCountMapper.class);
job.setReducerClass(FlowCountReducer.class);
// 3 指定mapper输出数据的kv类型
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(FlowBean.class);
// 4 指定最终输出的数据的kv类型
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(FlowBean.class);
// 5 指定job的输入原始文件所在目录
FileInputFormat.setInputPaths(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
// 7 将job中配置的相关参数，以及job所用的java类所在的jar包， 提交给yarn去运行
boolean result = job.waitForCompletion(true);
System.exit(result ? 0 : 1);
}
}
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