Hadoop 使用FileSystem API 读取数据

package com.hadoop;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;

public class FileSystemCat {

public static void main(String[] args) throws IOException {
String uri = args[0];

Configuration config = new Configuration();

FileSystem fs = FileSystem.get(URI.create(uri), config);

InputStream in = null;
try {
in = fs.open(new Path(uri));
IOUtils.copyBytes(in, System.out, 4096,false);
} finally {
IOUtils.closeStream(in);
}
}
}