requires
hadoop 2.5.0 running
hostname mapping
eclipse config
package com.dasenlin.hadoop;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
/**
* hadoop client use
*
*/
public class App
{
public static void main( String[] args ){
Configuration hadoopconf = new Configuration();
org.apache.hadoop.fs.FSDataInputStream inStream =null;
try {
FileSystem fileSystem = FileSystem.get(hadoopconf);
Path path = new Path("/user/jasper/conf/tmp/core-site.xml");
inStream = fileSystem.open(path);
IOUtils.copyBytes(inStream, System.out, 4096,false);
} catch (IOException e) {
e.printStackTrace();
}finally {
if(null!=inStream)IOUtils.closeStream(inStream);
}
}
}