hadoop 文件系统API操作

配置参数：-DHADOOP_USER_NAME=hadoop

public class HdfsUtils {
 
	private static FileSystem fileSystem;
 
	@Before
	public void init() throws IOException {
		Configuration conf = new Configuration();
		// fileSystem = FileSystem.get(conf);
	}
 
	@Test
	public void download() throws IOException {
		Configuration conf = new Configuration();
		FileSystem fileSystem = FileSystem.get(conf);
		Path path = new Path("/test");
		FSDataInputStream inStream = fileSystem.open(path);
		OutputStream outStream = new FileOutputStream("D:/test.txt");
		IOUtils.copy(inStream, outStream);
	}
 
	@Test
	public void upload2() throws IllegalArgumentException, IOException {
		fileSystem.copyFromLocalFile(new Path("D:/test.txt"), new Path("/test.txt"));
	}