hadoop重命名文件_用 Hadoop Java Api 针对 HDFS 进行文件上传、创建、重命名、删除等操作...

一、项目要加入的一些包：

二、下面是代码相关的：

package org.apache.hadoop.examples.yao;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.fs.FSDataOutputStream;

import org.apache.hadoop.fs.FileStatus;

import org.apache.hadoop.fs.FileSystem;

import org.apache.hadoop.fs.Path;

public class FileDemo {

public static void main(String[] args) throws IOException{

mkdir("test");

putFile("/home/yaokj/temp.txt","test/test.txt");

createFile("test/create.txt");

rename("test/test.txt","test/test2.txt");

System.out.println(deleteFile("test/test2.txt"));

System.out.println(getLastModifyTime("test/create.txt"));

System.out.println(isExists("test/create.txt"));

System.out.println(isExists("test/test2.txt"));

}

public static boolean isExists(String path) throws IOException{

FileSystem fs = getFileSystem() ;

return fs.exists(new Path(path));

}

public static long getLastModifyTime(String path) throws IOException{

FileSystem fs = getFileSystem() ;

FileStatus file = fs.getFileStatus(new Path(path));

return file.getModificationTime();

}

public static boolean deleteFile(String path) throws IOException{

FileSystem fs = getFileSystem() ;

return fs.delete(new Path(path),false);//false 为是否递归删除

}

public static void rename( String fromFile,String toFile) throws IOException{

FileSystem fs = getFileSystem() ;

fs.rename(new Path(fromFile), new Path(toFile));

fs.close();

}

public static void createFile(String file) throws IOException{

FileSystem fs = getFileSystem() ;

FSDataOutputStream fsd = fs.create(new Path(file));

byte[] witeByte = "Hello world , you know".getBytes();

fsd.write(witeByte, 0, witeByte.length);

fsd.close();

fs.close();

}

public static void putFile(String srcPath ,String dstPath) throws IOException{

FileSystem fs = getFileSystem() ;

Path src = new Path( srcPath);

Path dst = new Path(dstPath);

fs.copyFromLocalFile(src, dst);

FileStatus[] fileStatus = fs.listStatus(dst);

for(FileStatus status : fileStatus){

System.out.println(status.getPath());

}

fs.close();

}

public static void mkdir(String dst) throws IOException{

if(dst != null && !"".equals(dst)){

FileSystem fs = getFileSystem();

fs.mkdirs(new Path(dst));

fs.close();

}

}

public static FileSystem getFileSystem() throws IOException{

Configuration cfg = new Configuration();

cfg.addResource(new Path("/home/yaokj/hadoop-0.20.203.0/conf/hdfs-site.xml"));

cfg.addResource(new Path("/home/yaokj/hadoop-0.20.203.0/conf/core-site.xml"));

FileSystem fs = FileSystem.get(cfg);

return fs;

}

}