使用Hadoop自己的类操作HDFS

 package hdfs;

 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;

 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.IOUtils;

 public class App2 {
     static final String PATH = "hdfs://chaoren:9000/";
     static final String DIR = "/d1";
     static final String FILE = "/d1/hello";
     public static void main(String[] args) throws Exception {
         FileSystem fileSystem = getFileSystem();
         //创建文件夹     hadoop fs -mkdir   /f1
         mkdir(fileSystem);
         //上传文件  -put  src  des
         putData(fileSystem);
         //下载文件   hadoop fs -get src des
         //getData(fileSystem);
         //浏览文件夹
         list(fileSystem);
         //删除文件夹
         //remove(fileSystem);
     }
     private static void list(FileSystem fileSystem) throws IOException {
         final FileStatus[] listStatus = fileSystem.listStatus(new Path("/"));
         for (FileStatus fileStatus : listStatus) {
             String isDir = fileStatus.isDir()?"文件夹":"文件";
             final String permission = fileStatus.getPermission().toString();
             final short replication = fileStatus.getReplication();
             final long len = fileStatus.getLen();
             final String path = fileStatus.getPath().toString();
             System.out.println(isDir+"\t"+permission+"\t"+replication+"\t"+len+"\t"+path);
         }
     }
     private static void getData(FileSystem fileSystem) throws IOException {
         final FSDataInputStream in = fileSystem.open(new Path(FILE));
         IOUtils.copyBytes(in, System.out, 1024, true);
     }
     private static void putData(FileSystem fileSystem) throws IOException,
             FileNotFoundException {
         final FSDataOutputStream out = fileSystem.create(new Path(FILE));
         final FileInputStream in = new FileInputStream("H:/kuaipan/hadoop/classes/yy131009/day2/readme.txt");
         IOUtils.copyBytes(in, out, 1024, true);
     }
     private static void remove(FileSystem fileSystem) throws IOException {
         fileSystem.delete(new Path(DIR), true);
     }
     private static void mkdir(FileSystem fileSystem) throws IOException {
         fileSystem.mkdirs(new Path(DIR));
     }
     private static FileSystem getFileSystem() throws IOException, URISyntaxException {
         return FileSystem.get(new URI(PATH), new Configuration());
     }
 }