Java Code Examples for org.apache.commons.net.ftp.FTPClient#listFiles()

public static void removeFTPDirectory(FTPClient ftpClient, String directoryName) {
	try {
    	ftpClient.changeWorkingDirectory(directoryName);
    	for (FTPFile file : ftpClient.listFiles()) {
    		if (file.isDirectory()) {
    			FileUtils.removeFTPDirectory(ftpClient, file.getName());
    		} else {
        	    log.debug("Deleting " + file.getName());
    			ftpClient.deleteFile(file.getName());
    		}
    	}
    	ftpClient.changeWorkingDirectory(directoryName);
    	ftpClient.changeToParentDirectory();
	    log.debug("Deleting " + directoryName);
    	ftpClient.removeDirectory(directoryName);
	} catch (Exception ex) {
		
	}
}
 

public static List<String> listSequentialDatasets(
    String pdsName, Configuration conf) throws IOException {
  List<String> datasets = new ArrayList<String>();
  FTPClient ftp = null;
  try {
    ftp = getFTPConnection(conf);
    if (ftp != null) {
      ftp.changeWorkingDirectory("'" + pdsName + "'");
      FTPFile[] ftpFiles = ftp.listFiles();
      for (FTPFile f : ftpFiles) {
        if (f.getType() == FTPFile.FILE_TYPE) {
          datasets.add(f.getName());
        }
      }
    }
  } catch(IOException ioe) {
    throw new IOException ("Could not list datasets from " + pdsName + ":"
        + ioe.toString());
  } finally {
    if (ftp != null) {
      closeFTPConnection(ftp);
    }
  }
  return datasets;
}
 

/**
 * Convenience method, so that we don't open a new connection when using this
 * method from within another method. Otherwise every API invocation incurs
 * the overhead of opening/closing a TCP connection.
 */
private FileStatus[] listStatus(FTPClient client, Path file)
    throws IOException {
  Path workDir = new Path(client.printWorkingDirectory());
  Path absolute = makeAbsolute(workDir, file);
  FileStatus fileStat = getFileStatus(client, absolute);
  if (!fileStat.isDir()) {
    return new FileStatus[] { fileStat };
  }
  FTPFile[] ftpFiles = client.listFiles(absolute.toUri().getPath());
  FileStatus[] fileStats = new FileStatus[ftpFiles.length];
  for (int i = 0; i < ftpFiles.length; i++) {
    fileStats[i] = getFileStatus(ftpFiles[i], absolute);
  }
  return fileStats;
}
 

/**
 * Convenience method, so that we don't open a new connection when using this
 * method from within another method. Otherwise every API invocation incurs
 * the overhead of opening/closing a TCP connection.
 */
private FileStatus[] listStatus(FTPClient client, Path file)
    throws IOException {
  Path workDir = new Path(client.printWorkingDirectory());
  Path absolute = makeAbsolute(workDir, file);
  FileStatus fileStat = getFileStatus(client, absolute);
  if (!fileStat.isDir()) {
    return new FileStatus[] { fileStat };
  }
  FTPFile[] ftpFiles = client.listFiles(absolute.toUri().getPath());
  FileStatus[] fileStats = new FileStatus[ftpFiles.length];
  for (int i = 0; i < ftpFiles.length; i++) {
    fileStats[i] = getFileStatus(ftpFiles[i], absolute);
  }
  return fileStats;
}
 

/**
 * Convenience method, so that we don't open a new connection when using this
 * method from within another method. Otherwise every API invocation incurs
 * the overhead of opening/closing a TCP connection.
 */
private FileStatus[] listStatus(FTPClient client, Path file)
    throws IOException {
  Path workDir = new Path(client.printWorkingDirectory());
  Path absolute = makeAbsolute(workDir, file);
  FileStatus fileStat = getFileStatus(client, absolute);
  if (fileStat.isFile()) {
    return new FileStatus[] { fileStat };
  }
  FTPFile[] ftpFiles = client.listFiles(absolute.toUri().getPath());
  FileStatus[] fileStats = new FileStatus[ftpFiles.length];
  for (int i = 0; i < ftpFiles.length; i++) {
    fileStats[i] = getFileStatus(ftpFiles[i], absolute);
  }
  return fileStats;
}
 

/**
 *  获取全部的文件列表
 * @param path 路径
 * @return
 */
public List<FTPFile> getFileList(String path){
	List<FTPFile> list = new ArrayList<>();
	FTPClient ftpClient = borrowObject();
	try {
		FTPFile[] listFiles = ftpClient.listFiles(path);
		for (FTPFile ftpFile : listFiles) {
			byte[] bytes = ftpFile.getName().getBytes("iso-8859-1");
			ftpFile.setName(new String(bytes, "GBK"));
			list.add(ftpFile);
		}
	} catch (IOException e) {
		e.printStackTrace();
		throw new RuntimeException(e);
	}finally {
		returnObject(ftpClient);
	}
	return  list;
}
 

/**
 * Simple negative test that connects to the inbuilt ftp server and attempts to 
 * log on with the wrong password.
 * 
 * @throws Exception
 */
public void testFTPConnectNegative() throws Exception
{
    logger.debug("Start testFTPConnectNegative");

    FTPClient ftp = connectClient();

    try
    {
        int reply = ftp.getReplyCode();

        if (!FTPReply.isPositiveCompletion(reply))
        {
            fail("FTP server refused connection.");
        }
    
        boolean login = ftp.login(USER_ADMIN, "garbage");
        assertFalse("admin login successful", login);
        
        // now attempt to list the files and check that the command does not 
        // succeed
        FTPFile[] files = ftp.listFiles();
        
        assertNotNull(files);
        assertTrue(files.length == 0);
        reply = ftp.getReplyCode();
        
        assertTrue(FTPReply.isNegativePermanent(reply));
        
    } 
    finally
    {
        ftp.disconnect();
    }       
}
 

@Override
public FileInfo getRemoteFileInfo(final FlowFile flowFile, String path, String remoteFileName) throws IOException {
    final FTPClient client = getClient(flowFile);

    if (path == null) {
        int slashpos = remoteFileName.lastIndexOf('/');
        if (slashpos >= 0 && !remoteFileName.endsWith("/")) {
            path = remoteFileName.substring(0, slashpos);
            remoteFileName = remoteFileName.substring(slashpos + 1);
        } else {
            path = "";
        }
    }

    final FTPFile[] files = client.listFiles(path);
    FTPFile matchingFile = null;
    for (final FTPFile file : files) {
        if (file.getName().equalsIgnoreCase(remoteFileName)) {
            matchingFile = file;
            break;
        }
    }

    if (matchingFile == null) {
        return null;
    }

    return newFileInfo(matchingFile, path);
}
 

/** 
 * Description: 从FTP服务器下载文件 
 * @param host FTP服务器hostname 
 * @param port FTP服务器端口 
 * @param username FTP登录账号 
 * @param password FTP登录密码 
 * @param remotePath FTP服务器上的相对路径 
 * @param fileName 要下载的文件名 
 * @param localPath 下载后保存到本地的路径 
 * @return 
 */
public static boolean downloadFile(String host, int port, String username, String password, String remotePath, String fileName, String localPath) {
	boolean result = false;
	FTPClient ftp = new FTPClient();
	try {
		int reply;
		ftp.connect(host, port);
		// 如果采用默认端口，可以使用ftp.connect(host)的方式直接连接FTP服务器
		ftp.login(username, password);// 登录
		reply = ftp.getReplyCode();
		if (!FTPReply.isPositiveCompletion(reply)) {
			ftp.disconnect();
			return result;
		}
		ftp.changeWorkingDirectory(remotePath);// 转移到FTP服务器目录
		FTPFile[] fs = ftp.listFiles();
		for (FTPFile ff : fs) {
			if (ff.getName().equals(fileName)) {
				File localFile = new File(localPath + "/" + ff.getName());

				OutputStream is = new FileOutputStream(localFile);
				ftp.retrieveFile(ff.getName(), is);
				is.close();
			}
		}

		ftp.logout();
		result = true;
	} catch (IOException e) {
		e.printStackTrace();
	} finally {
		if (ftp.isConnected()) {
			try {
				ftp.disconnect();
			} catch (IOException ioe) {
			}
		}
	}
	return result;
}
 

/**
 * Convenience method, so that we don't open a new connection when using this
 * method from within another method. Otherwise every API invocation incurs
 * the overhead of opening/closing a TCP connection.
 */
private FileStatus getFileStatus(FTPClient client, Path file)
    throws IOException {
  FileStatus fileStat = null;
  Path workDir = new Path(client.printWorkingDirectory());
  Path absolute = makeAbsolute(workDir, file);
  Path parentPath = absolute.getParent();
  if (parentPath == null) { // root dir
    long length = -1; // Length of root dir on server not known
    boolean isDir = true;
    int blockReplication = 1;
    long blockSize = DEFAULT_BLOCK_SIZE; // Block Size not known.
    long modTime = -1; // Modification time of root dir not known.
    Path root = new Path("/");
    return new FileStatus(length, isDir, blockReplication, blockSize,
        modTime, root.makeQualified(this));
  }
  String pathName = parentPath.toUri().getPath();
  FTPFile[] ftpFiles = client.listFiles(pathName);
  if (ftpFiles != null) {
    for (FTPFile ftpFile : ftpFiles) {
      if (ftpFile.getName().equals(file.getName())) { // file found in dir
        fileStat = getFileStatus(ftpFile, parentPath);
        break;
      }
    }
    if (fileStat == null) {
      throw new FileNotFoundException("File " + file + " does not exist.");
    }
  } else {
    throw new FileNotFoundException("File " + file + " does not exist.");
  }
  return fileStat;
}
 

/**
 * List files using an FTP client
 */
public FTPFile[] listFiles(FTPClient ftp, URI uri) {
	synchronized (ftp) {
		try {
			return ftp.listFiles(uri.getPath());
		} catch (IOException e) {
			String msg = "Error reading remote directory '" + uri + "'";
			Timer.showStdErr(msg);
			throw new RuntimeException(msg, e);
		}
	}
}
 

/**
 * Convenience method, so that we don't open a new connection when using this
 * method from within another method. Otherwise every API invocation incurs
 * the overhead of opening/closing a TCP connection.
 */
private FileStatus getFileStatus(FTPClient client, Path file)
    throws IOException {
  FileStatus fileStat = null;
  Path workDir = new Path(client.printWorkingDirectory());
  Path absolute = makeAbsolute(workDir, file);
  Path parentPath = absolute.getParent();
  if (parentPath == null) { // root dir
    long length = -1; // Length of root dir on server not known
    boolean isDir = true;
    int blockReplication = 1;
    long blockSize = DEFAULT_BLOCK_SIZE; // Block Size not known.
    long modTime = -1; // Modification time of root dir not known.
    Path root = new Path("/");
    return new FileStatus(length, isDir, blockReplication, blockSize,
        modTime, root.makeQualified(this));
  }
  String pathName = parentPath.toUri().getPath();
  FTPFile[] ftpFiles = client.listFiles(pathName);
  if (ftpFiles != null) {
    for (FTPFile ftpFile : ftpFiles) {
      if (ftpFile.getName().equals(file.getName())) { // file found in dir
        fileStat = getFileStatus(ftpFile, parentPath);
        break;
      }
    }
    if (fileStat == null) {
      throw new FileNotFoundException("File " + file + " does not exist.");
    }
  } else {
    throw new FileNotFoundException("File " + file + " does not exist.");
  }
  return fileStat;
}
 

@Override
public FileInfo getRemoteFileInfo(final FlowFile flowFile, String path, String remoteFileName) throws IOException {
    final FTPClient client = getClient(flowFile);

    if (path == null) {
        int slashpos = remoteFileName.lastIndexOf('/');
        if (slashpos >= 0 && !remoteFileName.endsWith("/")) {
            path = remoteFileName.substring(0, slashpos);
            remoteFileName = remoteFileName.substring(slashpos + 1);
        } else {
            path = "";
        }
    }

    final FTPFile[] files = client.listFiles(path);
    FTPFile matchingFile = null;
    for (final FTPFile file : files) {
        if (file.getName().equalsIgnoreCase(remoteFileName)) {
            matchingFile = file;
            break;
        }
    }

    if (matchingFile == null) {
        return null;
    }

    return newFileInfo(matchingFile, path);
}
 

/**
     * Test CWD for FTP server
     * 
     * @throws Exception
     */
    public void testCWD() throws Exception
    {
        logger.debug("Start testCWD");
        
        FTPClient ftp = connectClient();

        try
        {
            int reply = ftp.getReplyCode();

            if (!FTPReply.isPositiveCompletion(reply))
            {
                fail("FTP server refused connection.");
            }
        
            boolean login = ftp.login(USER_ADMIN, PASSWORD_ADMIN);
            assertTrue("admin login successful", login);
            
            FTPFile[] files = ftp.listFiles();
            reply = ftp.getReplyCode();
            assertTrue(FTPReply.isPositiveCompletion(reply));

            assertTrue(files.length == 1);
            
            boolean foundAlfresco=false;
            for(FTPFile file : files)
            {
                logger.debug("file name=" + file.getName());
                assertTrue(file.isDirectory());
                
                if(file.getName().equalsIgnoreCase("Alfresco"))
                {
                    foundAlfresco=true;
                }
            }
            assertTrue(foundAlfresco);
            
            // Change to Alfresco Dir that we know exists
            reply = ftp.cwd("/Alfresco");
            assertTrue(FTPReply.isPositiveCompletion(reply));
            
            // relative path with space char
            reply = ftp.cwd("Data Dictionary");
            assertTrue(FTPReply.isPositiveCompletion(reply));
            
            // non existant absolute
            reply = ftp.cwd("/Garbage");
            assertTrue(FTPReply.isNegativePermanent(reply));
            
            reply = ftp.cwd("/Alfresco/User Homes");
            assertTrue(FTPReply.isPositiveCompletion(reply));
            
            // Wild card
            reply = ftp.cwd("/Alfresco/User*Homes");
            assertTrue("unable to change to /Alfresco User*Homes/", FTPReply.isPositiveCompletion(reply));
            
//            // Single char pattern match
//            reply = ftp.cwd("/Alfre?co");
//            assertTrue("Unable to match single char /Alfre?co", FTPReply.isPositiveCompletion(reply));
            
            // two level folder
            reply = ftp.cwd("/Alfresco/Data Dictionary");
            assertTrue("unable to change to /Alfresco/Data Dictionary", FTPReply.isPositiveCompletion(reply));
            
            // go up one
            reply = ftp.cwd("..");
            assertTrue("unable to change to ..", FTPReply.isPositiveCompletion(reply));
            
            reply = ftp.pwd();
            ftp.getStatus();
            
            assertTrue("unable to get status", FTPReply.isPositiveCompletion(reply));
            
            // check we are at the correct point in the tree
            reply = ftp.cwd("Data Dictionary");
            assertTrue(FTPReply.isPositiveCompletion(reply));
            

        } 
        finally
        {
            ftp.disconnect();
        }    

    }
 

/**
 * Test CRUD for FTP server
 *
 * @throws Exception
 */
public void testCRUD() throws Exception
{
    final String PATH1 = "FTPServerTest";
    final String PATH2 = "Second part";
    
    logger.debug("Start testFTPCRUD");
    
    FTPClient ftp = connectClient();

    try
    {
        int reply = ftp.getReplyCode();

        if (!FTPReply.isPositiveCompletion(reply))
        {
            fail("FTP server refused connection.");
        }
    
        boolean login = ftp.login(USER_ADMIN, PASSWORD_ADMIN);
        assertTrue("admin login successful", login);
                      
        reply = ftp.cwd("/Alfresco/User Homes");
        assertTrue(FTPReply.isPositiveCompletion(reply));
        
        // Delete the root directory in case it was left over from a previous test run
        try
        {
            ftp.removeDirectory(PATH1);
        }
        catch (IOException e)
        {
            // ignore this error
        }
        
        // make root directory
        ftp.makeDirectory(PATH1);
        ftp.cwd(PATH1);
        
        // make sub-directory in new directory
        ftp.makeDirectory(PATH2);
        ftp.cwd(PATH2);
        
        // List the files in the new directory
        FTPFile[] files = ftp.listFiles();
        assertTrue("files not empty", files.length == 0);
        
        // Create a file
        String FILE1_CONTENT_1="test file 1 content";
        String FILE1_NAME = "testFile1.txt";
        ftp.appendFile(FILE1_NAME , new ByteArrayInputStream(FILE1_CONTENT_1.getBytes("UTF-8")));
        
        // Get the new file
        FTPFile[] files2 = ftp.listFiles();
        assertTrue("files not one", files2.length == 1);
        
        InputStream is = ftp.retrieveFileStream(FILE1_NAME);
        
        String content = inputStreamToString(is);
        assertEquals("Content is not as expected", content, FILE1_CONTENT_1);
        ftp.completePendingCommand();
        
        // Update the file contents
        String FILE1_CONTENT_2="That's how it is says Pooh!";
        ftp.storeFile(FILE1_NAME , new ByteArrayInputStream(FILE1_CONTENT_2.getBytes("UTF-8")));
        
        InputStream is2 = ftp.retrieveFileStream(FILE1_NAME);
        
        String content2 = inputStreamToString(is2);
        assertEquals("Content is not as expected", FILE1_CONTENT_2, content2);
        ftp.completePendingCommand();
        
        // now delete the file we have been using.
        assertTrue (ftp.deleteFile(FILE1_NAME));
        
        // negative test - file should have gone now.
        assertFalse (ftp.deleteFile(FILE1_NAME));
        
    } 
    finally
    {
        // clean up tree if left over from previous run

        ftp.disconnect();
    }    
}
 

@Override
public AnswerItem<AppService> getFTP(HashMap<String, String> informations, FTPClient ftp, AppService myResponse) throws IOException {
    MessageEvent message = null;
    AnswerItem<AppService> result = new AnswerItem<>();
    LOG.info("Start retrieving ftp file");
    FTPFile[] ftpFile = ftp.listFiles(informations.get("path"));
    if (ftpFile.length != 0) {
        InputStream done = ftp.retrieveFileStream(informations.get("path"));
        boolean success = ftp.completePendingCommand();
        myResponse.setResponseHTTPCode(ftp.getReplyCode());
        if (success && FTPReply.isPositiveCompletion(myResponse.getResponseHTTPCode())) {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buf = new byte[1024];
            int n = 0;
            while ((n = done.read(buf)) >= 0) {
                baos.write(buf, 0, n);
            }
            byte[] content = baos.toByteArray();
            myResponse.setFile(content);
            LOG.info("ftp file successfully retrieve");
            message = new MessageEvent(MessageEventEnum.ACTION_SUCCESS_CALLSERVICE);
            message.setDescription(message.getDescription().replace("%SERVICEMETHOD%", "GET"));
            message.setDescription(message.getDescription().replace("%SERVICEPATH%", informations.get("path")));
            result.setResultMessage(message);
            String expectedContent = IOUtils.toString(new ByteArrayInputStream(content), "UTF-8");
            String extension = testCaseExecutionFileService.checkExtension(informations.get("path"), "");
            if ("JSON".equals(extension) || "XML".equals(extension) || "TXT".equals(extension)) {
                myResponse.setResponseHTTPBody(expectedContent);
            }
            myResponse.setResponseHTTPBodyContentType(extension);
            result.setItem(myResponse);
            baos.close();
        } else {
            LOG.error("Error when downloading the file. Something went wrong");
            message = new MessageEvent(MessageEventEnum.ACTION_FAILED_CALLSERVICE);
            message.setDescription(message.getDescription().replace("%SERVICE%", informations.get("path")));
            message.setDescription(message.getDescription().replace("%DESCRIPTION%",
                    "Error when downloading the file. Something went wrong"));
            result.setResultMessage(message);
        }
        done.close();
    } else {
        LOG.error("The file is not present on FTP server. Please check the FTP path");
        message = new MessageEvent(MessageEventEnum.ACTION_FAILED_CALLSERVICE);
        message.setDescription(message.getDescription().replace("%SERVICE%", informations.get("path")));
        message.setDescription(message.getDescription().replace("%DESCRIPTION%",
                "Impossible to retrieve the file. Please check the FTP path"));
        result.setResultMessage(message);
    }
    return result;
}
 

/**
 * 文件下载
 * <p>
 *     文件下载失败时，该方法会自动登出服务器并释放FTP连接，然后抛出RuntimeException
 *     读取文件流后，一定要调用completePendingCommand()告诉FTP传输完毕，否则会导致该FTP连接在下一次读取不到文件
 * </p>
 * @param hostname  目标主机地址
 * @param username  FTP登录用户
 * @param password  FTP登录密码
 * @param remoteURL 保存在FTP上的含完整路径和后缀的完整文件名
 */
public static InputStream download(String hostname, String username, String password, String remoteURL){
    if(!login(hostname, username, password, DEFAULT_DEFAULT_TIMEOUT, DEFAULT_CONNECT_TIMEOUT, DEFAULT_DATA_TIMEOUT)){
        throw new SeedException(CodeEnum.SYSTEM_BUSY.getCode(), "FTP服务器登录失败");
    }
    FTPClient ftpClient = ftpClientMap.get();
    try{
        //注意这里没有写成new String(remoteURL.getBytes(DEFAULT_CHARSET), "ISO-8859-1")
        //这是因为有时会因为编码的问题导致明明ftp上面有文件，但读到的是空数组，所以我们就使用默认编码
        FTPFile[] files = ftpClient.listFiles(new String(remoteURL.getBytes(DEFAULT_CHARSET)));
        if(1 != files.length){
            logout();
            throw new SeedException(CodeEnum.FILE_NOT_FOUND.getCode(), "远程文件["+remoteURL+"]不存在");
        }
        InputStream is = ftpClient.retrieveFileStream(remoteURL);
        //拷貝InputStream
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buff = new byte[1024];
        int len;
        while((len=is.read(buff)) > -1){
            baos.write(buff, 0, len);
        }
        baos.flush();
        //事实上就像JDK的API所述：Closing a ByteArrayOutputStream has no effect
        //查询ByteArrayOutputStream.close()的源码会发现，它没有做任何事情,所以其close()与否是无所谓的
        baos.close();
        IOUtils.closeQuietly(is);
        //completePendingCommand()會一直等待FTPServer返回[226 Transfer complete]
        //但是FTPServer需要在InputStream.close()執行之後才會返回，所以要先執行InputStream.close()
        //201704121637測試發現：對於小文件，沒有調用close()，直接completePendingCommand()也會返回true
        //但大文件就會卡在completePendingCommand()位置，所以上面做了一步InputStream拷貝
        if(!ftpClient.completePendingCommand()){
            logout();
            throw new SeedException(CodeEnum.SYSTEM_BUSY.getCode(), "File transfer failed.");
        }
        return new ByteArrayInputStream(baos.toByteArray());
    }catch(IOException e){
        logout();
        throw new SeedException(CodeEnum.SYSTEM_BUSY.getCode(), "从FTP服务器["+hostname+"]下载文件["+remoteURL+"]失败，堆棧軌跡如下：", e);
    }
}
 

/**  
     * 上传文件到FTP服务器，支持断点续传  
     *  localAbsoluteFile 本地文件名称，绝对路径
     *  remoteAbsoluteFile 远程文件路径，使用/home/directory1/subdirectory/file.ext或是 http://www.guihua.org /subdirectory/file.ext
     * 							按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
     * @return 上传结果
     * @throws IOException
     */  
    public Map upload() throws Exception {
    	FTPClient ftpClient =null;
    	Map result=new HashMap();

    	String flag="1";
        try {
        	ftpClient =getFTPClient();
            File f = new File(localfilename);
            long localSize = f.length();  
            threadpara.put("filesize", localSize);
            //对远程目录的处理   
            if(serverfilename.contains("/")){   
                //创建服务器远程目录结构，创建失败直接返回   
                if(!mkdirMore(serverfilename.substring(0,serverfilename.lastIndexOf("/")+1))){  
                	threadpara.put("flag","0");
                	return threadpara;
                }   
            }   
            //检查远程是否存在文件   
            FTPFile[] files = ftpClient.listFiles(new String(serverfilename.getBytes("GBK"),"iso-8859-1"));
            if(files.length == 1){   
                long remoteSize = files[0].getSize();   
                if(remoteSize>=localSize){
                	threadpara.put("flag","1");
                	return threadpara;
                }
                //尝试移动文件内读取指针,实现断点续传   
                result = uploadFile(serverfilename, f,remoteSize);   
                   
                //如果断点续传没有成功，则删除服务器上文件，重新上传   
                if("0".equals(result.get("flag").toString())){   
                    if(!ftpClient.deleteFile(serverfilename)){   
                        return result;   
                    }   
                    result = uploadFile(serverfilename, f,  0);   
                }   
            }else {   
                result = uploadFile(serverfilename, new File(localfilename),  0);
            }   
        } catch (Exception e1) {
//        	result=result;
			// TODO Auto-generated catch block
			//e1.printStackTrace();
			throw e1;
		}
        threadpara.put("flag",result.get("flag"));
    	return threadpara;
    }
 

public static void main(final String[] args) throws Exception {
    if (args.length < 3) {
        throw new IllegalArgumentException("Usage: FtpCheck user pass host dir");
    }
    final String user = args[0];
    final String pass = args[1];
    final String host = args[2];
    String dir = null;
    if (args.length == 4) {
        dir = args[3];
    }

    final FTPClient client = new FTPClient();
    client.connect(host);
    final int reply = client.getReplyCode();
    if (!FTPReply.isPositiveCompletion(reply)) {
        throw new IllegalArgumentException("cant connect: " + reply);
    }
    if (!client.login(user, pass)) {
        throw new IllegalArgumentException("login failed");
    }
    client.enterLocalPassiveMode();

    final OutputStream os = client.storeFileStream(dir + "/test.txt");
    if (os == null) {
        throw new IllegalStateException(client.getReplyString());
    }
    os.write("test".getBytes(Charset.defaultCharset()));
    os.close();
    client.completePendingCommand();

    if (dir != null && !client.changeWorkingDirectory(dir)) {
        throw new IllegalArgumentException("change dir to '" + dir + "' failed");
    }

    System.err.println("System: " + client.getSystemType());

    final FTPFile[] files = client.listFiles();
    for (int i = 0; i < files.length; i++) {
        final FTPFile file = files[i];
        if (file == null) {
            System.err.println("#" + i + ": " + null);
        } else {
            System.err.println("#" + i + ": " + file.getRawListing());
            System.err.println("#" + i + ": " + file.toString());
            System.err.println("\t name:" + file.getName() + " type:" + file.getType());
        }
    }
    client.disconnect();
}
 

private boolean remoteFileExists(FTPClient ftpClient, String filePath) throws IOException {
    return ftpClient.listFiles(filePath).length != 0;
}