JAVA 调用HDFS

/**
   * 判断是否为文件
   * @author julong
   * @date 2016-11-24 下午04:44:31
   */
  public static void isFile(){
    try {
      //创建文件配置对象
      Configuration configuration = new Configuration();
      //定义URL
      URI uri = URI.create("hdfs://192.168.205.110:9000/");
      //获取文件系统
      FileSystem fileSystem = FileSystem.get(uri,configuration); 
      Path path = new Path("/user/input/test");
      boolean result = fileSystem.isFile(path);
      logger.info("是否为文件："+result);
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
  }

  /**
   * 判断是否存在此文件或者目录
   * @author julong
   * @date 2016-11-24 下午04:47:12
   */
  public static void exists(){
    try {
      //创建文件配置对象
      Configuration configuration = new Configuration();
      //定义URL
      URI uri = URI.create("hdfs://192.168.205.110:9000/");
      //获取文件系统
      FileSystem fileSystem = FileSystem.get(uri,configuration); 
      Path path = new Path("/user/input/test");
      boolean result = fileSystem.exists(path);
      logger.info("判断是否存在此文件或者目录："+result);
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
  }

  /**
   * 复制本地文件到HDFS
   * @author julong
   * @date 2016-11-24 下午05:06:27
   */
  public static void copyFromLocalFile(){
    try {
      //创建文件配置对象
      Configuration configuration = new Configuration();
      //定义URL
      URI uri = URI.create("hdfs://192.168.205.110:9000/");
      //获取文件系统
      FileSystem fileSystem = FileSystem.get(uri,configuration); 
      fileSystem.copyFromLocalFile( new Path("C://maven.txt"),new Path("/user/input/maven.txt"));
      logger.info("本地复制文件到HDFS成功！");
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
  }

  /**
   * 复制文件到本地
   * @author julong
   * @date 2016-11-24 下午05:26:56
   */
  public static void copyToLocalFile(){
    try {
      //创建文件配置对象
      Configuration configuration = new Configuration();
      //定义URL
      URI uri = URI.create("hdfs://192.168.205.110:9000/");
      //获取文件系统
      FileSystem fileSystem = FileSystem.get(uri,configuration); 
      FSDataInputStream fsDataInputStream  = fileSystem.open(new Path("/user/input/LICENSE.txt"));
      OutputStream outputStream = new FileOutputStream(new File("C:\\LICENSE.txt"));
      IOUtils.copyBytes(fsDataInputStream, outputStream, 4096);
      logger.info("完成文件复制");
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
  }