HDFS的java客户端操作代码(Windows上面打jar包，提交至linux运行)

1.通过java.net.URL实现屏幕显示demo1文件的内容

 1 package Hdfs;
 2 import java.io.InputStream;
 3 import java.net.URL;
 4 import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;
 5 import org.apache.hadoop.io.IOUtils;
 6 
 7 public class JarDemo {
 8     static{
 9         URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory());
10     }
11     public static void main(String[] args) {
12         InputStream in =null;
13         try {
14             in= new URL(args[0]).openStream();
15             IOUtils.copyBytes(in, System.out, 4096,false);
16         } catch (Exception e) {
17             e.printStackTrace();
18         } finally{
19             IOUtils.closeStream(in);
20         }
21         
22     }
23 }