使用FileSystem以标准输出格式显示HDFS当中的文件

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 Exception {        String uri = args[0];        Configuration conf = new Configuration();        FileSystem fs = FileSystem.get(URI.create(uri), conf);        InputStream in = null;        try {in = fs.open(new Path(uri));IOUtils.copyBytes(in, System.out, 4096, false);} catch (Exception e) {} finally {IOUtils.closeStream(in);}  }}

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