Configured

Configuration、FileSystem

小白写博客，在hadoop集群写入文件，看完configuration和configured等的源码之后的心德

hadoop集群写入文件

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;/*** hadoop jar   Hadoop_test-1.0-SNAPSHOT.jar  com.jxlg.hdfs.ConfigHdfs* -D input=/etc/passwd -D  output=passwd/passwd.txt**/
import java.io.FileInputStream;
import java.io.OutputStream;public class ConfigHdfs extends Configured implements Tool {@Overridepublic int run(String[] strings) throws Exception {Configuration conf=getConf();String input =conf.get("input");String output=conf.get("output");FileSystem fs = FileSystem.get(conf);FileInputStream fis=new FileInputStream(input);OutputStream os=fs.create(new Path(output));byte []b=new byte[1024];int len;while((len=fis.read(b))!=-1){os.write(b,0,len);os.flush();}if(os!=null)os.close();if(fis!=null)fis.close();return 0;}public  static void main(String[] args) throws Exception {int n= new ToolRunner().run(new ConfigHdfs(),args);System.exit(n);}
}

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Configuration、FileSystem

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