Run word count on Eclipse on Mac

1. After opening eclipse, build the WordCount project

 PackageWordCount;Importjava.io.IOException; ImportJava.util.StringTokenizer; Importorg.apache.hadoop.conf.Configuration; ImportOrg.apache.hadoop.fs.Path; Importorg.apache.hadoop.io.IntWritable; Importorg.apache.hadoop.io.LongWritable; ImportOrg.apache.hadoop.io.Text; ImportOrg.apache.hadoop.mapreduce.Job; ImportOrg.apache.hadoop.mapreduce.Mapper; ImportOrg.apache.hadoop.mapreduce.Reducer; ImportOrg.apache.hadoop.mapreduce.lib.input.FileInputFormat; ImportOrg.apache.hadoop.mapreduce.lib.output.FileOutputFormat;  Public classWordCount { Public Static classTokenizermapperextendsmapper<longwritable, text, text, intwritable>{          Private Final StaticIntwritable one =NewIntwritable (1); PrivateText Word =NewText ();  Public voidmap (longwritable key, Text value, context context)throwsIOException, interruptedexception {stringtokenizer ITR=NewStringTokenizer (value.tostring ());  while(Itr.hasmoretokens ()) {Word.set (Itr.nexttoken ());              Context.write (Word, one); }          }      }       Public Static classIntsumreducerextendsReducer<text, Intwritable, Text, intwritable> {          Privateintwritable result =Newintwritable ();  Public voidReduce (Text key, iterable<intwritable>values, context context)throwsIOException, interruptedexception {intsum = 0;  for(intwritable val:values) {sum+=Val.get ();              } result.set (sum);          Context.write (key, result); }      }       Public Static voidMain (string[] args)throwsException {Configuration conf=NewConfiguration (); if(Args.length! = 2) {System.err.println ("Usage:wordcount"); System.exit (2); } Job Job=NewJob (conf, "word count"); Job.setjarbyclass (WordCount.class); Job.setmapperclass (tokenizermapper.class); Job.setreducerclass (intsumreducer.class); Job.setmapoutputkeyclass (Text.class); Job.setmapoutputvalueclass (intwritable.class); Job.setoutputkeyclass (Text.class); Job.setoutputvalueclass (intwritable.class); Fileinputformat.addinputpath (Job,NewPath (args[0])); Fileoutputformat.setoutputpath (Job,NewPath (args[1])); System.exit (Job.waitforcompletion (true) ? 0:1); }  }  

2. Configure the Hadoop path.

Put the files that need to be run into the input folder, how to configure the file path and run result path on the run configuration on Eclipse, separated by a space, how to click Apply-run and start running.

3. View results with terminal

 jias-macbook-pro:output jia$ cat part-r-00000 do  2excuse  1fine  1hello  2how  1me  1thank  2you  3