FileSystem fileSystem;
    
    /*
     * 初始化
     */
    @Before
    public void init() throws Exception{
        //读取数据由平台上的协议确定
        URI uri = new URI("hdfs://192.168.*.*:9000");
        Configuration conf = new Configuration();
        fileSystem = FileSystem.get(uri, conf);
    }
    
    /*
     * 查看目录
     */
    @Test
    public void Catalog() throws Exception{
        Path path = new Path("/poker");
        FileStatus fileStatus = fileSystem.getFileStatus(path);
        System.out.println("*************************************");    
        System.out.println("文件根目录: "+fileStatus.getPath()); 
        System.out.println("这文件目录为：");
        for(FileStatus fs : fileSystem.listStatus(path)){ 
            System.out.println(fs.getPath()); 
        } 
    }
    
    /*
     * 浏览文件
     */
    @Test
    public void look() throws Exception{
        Path path = new Path("/core-site.xml");
        FSDataInputStream fsDataInputStream = fileSystem.open(path);
        System.out.println("*************************************");
        System.out.println("浏览文件：");
        int c;
        while((c = fsDataInputStream.read()) != -1){
            System.out.print((char)c);
            }
        fsDataInputStream.close();
    }
    
    /*
     * 上传文件
     */
    @Test
    public void upload() throws Exception{
        Path srcPath = new Path("C:/Users/Administrator/Desktop/hadoop/hadoop.txt");  
        Path dstPath = new Path("/");  
        fileSystem.copyFromLocalFile(false, srcPath, dstPath);
        fileSystem.close(); 
        System.out.println("*************************************");
        System.out.println("上传成功！");
    }
    
    /*
     * 下载文件
     */
    @Test
    public void download() throws Exception{
        InputStream in = fileSystem.open(new Path("/hadoop.txt"));  
        OutputStream out = new FileOutputStream("E://hadoop.txt");  
        IOUtils.copyBytes(in, out, 4096, true);  
    }
    
    /*
     * 删除文件
     */
    @Test
    public void delete() throws Exception{
        Path path = new Path("hdfs://192.168.*.*:9000/hadoop.txt");
        fileSystem.delete(path,true);
        System.out.println("*************************************");
        System.out.println("删除成功！");
    }