java程序把本地的一个文件拷贝到hdfs上并显示进度

把程序打成jar包放到Linux上
转到目录下执行命令 hadoop jar mapreducer.jar /home/clq/export/java/count.jar  hdfs://ubuntu:9000/out06/count/
上面一个是本地文件,一个是上传hdfs位置

成功后出现:打印出来,你所要打印的字符。

 

package com.clq.hdfs;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.Progressable;

public class FileCopyWithProgress {
//********************************
//把本地的一个文件拷贝到hdfs上
//********************************
	public static void main(String[] args) throws IOException {
		String localSrc = args[0];
		String dst = args[1];
		InputStream in = new BufferedInputStream(new FileInputStream(localSrc));
		Configuration conf = new Configuration();
		FileSystem fs = FileSystem.get(URI.create(dst), conf);
		FSDataOutputStream out = fs.create(new Path(dst), new Progressable() {
			@Override
			public void progress() {
				System.out.print(".");
			}
		});
		IOUtils.copyBytes(in, out, conf, true);
	}

}

可能出现异常:
Exception in thread “main” org.apache.hadoop.ipc.RemoteException: java.io.IOException: Cannot create /out06; already exists as a directory
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1569)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1527)
at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:710)
at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:689)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1432)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1428)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
说明你这个路径在hdfs上已经存在,换一个即可。

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