電商專案實戰-瀏覽量統計功能實現3
阿新 • • 發佈:2021-07-22
1、統計頁面的瀏覽量
將讀入進來的檔案
count
將一行記錄做成一個固定的key,value賦值為1
2、PVStartApp.java
src/main/java/project/mrv1/PVStartApp.java
package project.mrv1; /* * 第一版本瀏覽量的統計 */ import mr.access.Access; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.LongWritable; importorg.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;import java.io.IOException; public class PVStartApp { public static void main(String[] args) throws Exception{ Configuration configuration = new Configuration(); Job job = Job .getInstance(configuration); job.setJarByClass(PVStartApp.class); job.setMapperClass(MyMapper.class); job.setReducerClass(MyReducer.class); job.setMapOutputKeyClass(Text.class); job.setMapOutputValueClass(LongWritable.class); job.setOutputKeyClass(NullWritable.class); job.setOutputValueClass(LongWritable.class); FileInputFormat.setInputPaths(job, new Path("access/raw/input/trackinfo_20130721.data")); FileOutputFormat.setOutputPath(job, new Path("output/v1/pvstart")); job.waitForCompletion(true); } static class MyMapper extends Mapper<LongWritable, Text, Text, LongWritable>{ //將key固定 private Text KEY = new Text("key"); private LongWritable ONE = new LongWritable(1); //在這裡要實現一個map方法 //直接輸入map+回車 @Override protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { context.write(KEY, ONE); } } static class MyReducer extends Reducer<Text, LongWritable, NullWritable, LongWritable>{ //在這裡要實現一個reduce方法 //直接輸入reduce+回車 @Override protected void reduce(Text key, Iterable<LongWritable> values, Context context) throws IOException, InterruptedException { long count = 0; for (LongWritable value: values){ count++; } context.write(NullWritable.get(), new LongWritable(count)); } } }
3、trackinfo_20130721.data
access/raw/input/trackinfo_20130721.data
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