wordcount-使用eclipse插件中对文件路径的修改

package com.sdnware.start01.hadoop; import java.io.IOException; import java.net.URI; import java.util.StringTokenizer; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; 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 WordCount { public static class TokenizerMapper extends Mapper<Object, Text, Text, IntWritable> { private final static IntWritable one = new IntWritable(1); private Text word = new Text(); public void map(Object key, Text value, Context context) throws IOException, InterruptedException { StringTokenizer itr = new StringTokenizer(value.toString()); while (itr.hasMoreTokens()) { word.set(itr.nextToken()); context.write(word, one); } } } public static class IntSumReducer extends Reducer<Text, IntWritable, Text, IntWritable> { private IntWritable result = new IntWritable(); public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { int sum = 0; for (IntWritable val : values) { sum += val.get(); } result.set(sum); context.write(key, result); } } public static void main(String[] args) throws Exception { System.setProperty("hadoop.home.dir", "D:/soft/hadoop-2.6.0"); System.setProperty("HADOOP_USER_NAME","root");//制定上传的用户 Configuration conf = new Configuration(); FileSystem hdfs = FileSystem.get(new URI("hdfs://f1:9000"), conf); Path outpath = new Path("/user/result"); if(hdfs.exists(outpath)){ hdfs.delete(outpath,true); } Job job = new Job(conf, "word count"); job.setJarByClass(WordCount.class); job.setMapperClass(TokenizerMapper.class); job.setCombinerClass(IntSumReducer.class); job.setReducerClass(IntSumReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); //使用hdfs协议读取远程待处理文件 FileInputFormat.addInputPath(job, new Path(new URI("hdfs://f1:9000/user/wordcount"))); FileOutputFormat.setOutputPath(job,new Path(new URI("hdfs://f1:9000/user/result"))); System.exit(job.waitForCompletion(true) ? 0 : 1); } }

附上pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.sdnware</groupId> <artifactId>start01</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>start01</name> <url>http://maven.apache.org</url> <repositories> <repository> <id>cloudera</id> <url>https://repository.cloudera.com/artifactory/cloudera-repos/</url> </repository> </repositories> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-core</artifactId> <version>2.6.0-mr1-cdh5.10.0</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>2.6.0-cdh5.10.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs --> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-hdfs</artifactId> <version>2.6.0-cdh5.10.0</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> </project>