代码：
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);}}
}
hadoop中执行：
