package com.ghgj.cn.zy;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Random;

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

public class InputRandom {
    //從隨機地方讀檔案，讀任意長度
    public static void main(String[] args) throws IOException, InterruptedException, URISyntaxException {
        Random rand = new Random(10);
        Configuration conf = new Configuration();
 

        FileSystem fs = FileSystem.get(new URI("hdfs://hadoop01:9000"), conf, "hadoop");
        //建立輸入流
        FSDataInputStream open = fs.open(new Path("/tt/aa/ff.txt"));
        open.seek(rand.nextInt(100));
        //建立輸出流
        FSDataOutputStream create = fs.create(new Path("/t"));
        int i = rand.nextInt
 
(100);
        IOUtils.copyBytes(open, create, new Long(i), true);

    }

}