DataReadByURL.java

package xyz.anduo.crawler;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;
import org.apache.hadoop.io.IOUtils;

public class DataReadByURL {
  static {
    URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
  }

  public static void main(String[] args) {
    InputStream in = null;
    try {
      in = new URL("hdfs://127.0.0.1:9000/data/mydata").openStream();
      IOUtils.copyBytes(in, System.out, 2048, false);

    } catch (MalformedURLException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

  }
}