Java使用apache commons连接ftp修改ftp文件名失败原因

今天被ftp上中文名修改坑了好久

项目用的是 apache commons 里的 FtpClient 实现的对ftp文件的上传下载操作，今天增加了业务要修改ftp上的文件名，然后就一直的报错，问题是它修改名字的方法只返回一个boolean，没有异常，这就很蛋疼了，找了好久才发现是中文的名字的原因

改名

直接上代码

package net.codejava.ftp;import java.io.IOException;import org.apache.commons.net.ftp.FTPClient;public class FTPRenamer {public static void main(String[] args) {String server = "www.ftpserver.com";int port = 21;String user = "username";String pass = "password";FTPClient ftpClient = new FTPClient();try {ftpClient.connect(server, port);ftpClient.login(user, pass);// renaming directoryString oldDir = "/photo";String newDir = "/photo_2012";boolean success = ftpClient.rename(oldDir, newDir);if (success) {System.out.println(oldDir + " was successfully renamed to: "+ newDir);} else {System.out.println("Failed to rename: " + oldDir);}// renaming fileString oldFile = "/work/error.png";String newFile = "/work/screenshot.png";success = ftpClient.rename(oldFile, newFile);if (success) {System.out.println(oldFile + " was successfully renamed to: "+ newFile);} else {System.out.println("Failed to rename: " + oldFile);}ftpClient.logout();ftpClient.disconnect();} catch (IOException ex) {ex.printStackTrace();} finally {if (ftpClient.isConnected()) {try {ftpClient.logout();ftpClient.disconnect();} catch (IOException ex) {ex.printStackTrace();}}}}
}

如果修改的名字里没有中文，用上面的代码就够了，但如果有中文就要对文件名进行转码了，转码代码如下

// renaming file
String oldFile = "/work/你好.png";
String newFile = "/work/世界.png";success = ftpClient.rename(new String(oldFile.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1),new String(newFile.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1)
);

这样再修改名字就没有问题了

顺便记录一下上传、下载、删除、检查文件是否存在，同样的，如果有中文名，最好先转一下码再进行操作

上传

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;/*** A program that demonstrates how to upload files from local computer* to a remote FTP server using Apache Commons Net API.* @author www.codejava.net*/
public class FTPUploadFileDemo {public static void main(String[] args) {String server = "www.myserver.com";int port = 21;String user = "user";String pass = "pass";FTPClient ftpClient = new FTPClient();try {ftpClient.connect(server, port);ftpClient.login(user, pass);ftpClient.enterLocalPassiveMode();ftpClient.setFileType(FTP.BINARY_FILE_TYPE);// APPROACH #1: uploads first file using an InputStreamFile firstLocalFile = new File("D:/Test/Projects.zip");String firstRemoteFile = "Projects.zip";InputStream inputStream = new FileInputStream(firstLocalFile);System.out.println("Start uploading first file");boolean done = ftpClient.storeFile(firstRemoteFile, inputStream);inputStream.close();if (done) {System.out.println("The first file is uploaded successfully.");}// APPROACH #2: uploads second file using an OutputStreamFile secondLocalFile = new File("E:/Test/Report.doc");String secondRemoteFile = "test/Report.doc";inputStream = new FileInputStream(secondLocalFile);System.out.println("Start uploading second file");OutputStream outputStream = ftpClient.storeFileStream(secondRemoteFile);byte[] bytesIn = new byte[4096];int read = 0;while ((read = inputStream.read(bytesIn)) != -1) {outputStream.write(bytesIn, 0, read);}inputStream.close();outputStream.close();boolean completed = ftpClient.completePendingCommand();if (completed) {System.out.println("The second file is uploaded successfully.");}} catch (IOException ex) {System.out.println("Error: " + ex.getMessage());ex.printStackTrace();} finally {try {if (ftpClient.isConnected()) {ftpClient.logout();ftpClient.disconnect();}} catch (IOException ex) {ex.printStackTrace();}}}}

下载

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;/*** A program demonstrates how to upload files from local computer to a remote* FTP server using Apache Commons Net API.* @author www.codejava.net*/
public class FTPDownloadFileDemo {public static void main(String[] args) {String server = "www.myserver.com";int port = 21;String user = "user";String pass = "pass";FTPClient ftpClient = new FTPClient();try {ftpClient.connect(server, port);ftpClient.login(user, pass);ftpClient.enterLocalPassiveMode();ftpClient.setFileType(FTP.BINARY_FILE_TYPE);// APPROACH #1: using retrieveFile(String, OutputStream)String remoteFile1 = "/test/video.mp4";File downloadFile1 = new File("D:/Downloads/video.mp4");OutputStream outputStream1 = new BufferedOutputStream(new FileOutputStream(downloadFile1));boolean success = ftpClient.retrieveFile(remoteFile1, outputStream1);outputStream1.close();if (success) {System.out.println("File #1 has been downloaded successfully.");}// APPROACH #2: using InputStream retrieveFileStream(String)String remoteFile2 = "/test/song.mp3";File downloadFile2 = new File("D:/Downloads/song.mp3");OutputStream outputStream2 = new BufferedOutputStream(new FileOutputStream(downloadFile2));InputStream inputStream = ftpClient.retrieveFileStream(remoteFile2);byte[] bytesArray = new byte[4096];int bytesRead = -1;while ((bytesRead = inputStream.read(bytesArray)) != -1) {outputStream2.write(bytesArray, 0, bytesRead);}success = ftpClient.completePendingCommand();if (success) {System.out.println("File #2 has been downloaded successfully.");}outputStream2.close();inputStream.close();} catch (IOException ex) {System.out.println("Error: " + ex.getMessage());ex.printStackTrace();} finally {try {if (ftpClient.isConnected()) {ftpClient.logout();ftpClient.disconnect();}} catch (IOException ex) {ex.printStackTrace();}}}
}

删除

import java.io.IOException;import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;public class FTPDeleteFileDemo {public static void main(String[] args) {String server = "www.myserver.com";int port = 21;String user = "user";String pass = "pass";FTPClient ftpClient = new FTPClient();try {ftpClient.connect(server, port);int replyCode = ftpClient.getReplyCode();if (!FTPReply.isPositiveCompletion(replyCode)) {System.out.println("Connect failed");return;}boolean success = ftpClient.login(user, pass);if (!success) {System.out.println("Could not login to the server");return;}String fileToDelete = "/repository/video/cool.mp4";boolean deleted = ftpClient.deleteFile(fileToDelete);if (deleted) {System.out.println("The file was deleted successfully.");} else {System.out.println("Could not delete the  file, it may not exist.");}} catch (IOException ex) {System.out.println("Oh no, there was an error: " + ex.getMessage());ex.printStackTrace();} finally {// logs out and disconnects from servertry {if (ftpClient.isConnected()) {ftpClient.logout();ftpClient.disconnect();}} catch (IOException ex) {ex.printStackTrace();}}}}

检查文件/文件夹是否存在

package net.codejava.ftp;import java.io.IOException;
import java.io.InputStream;
import java.net.SocketException;import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;/*** This program demonstrates how to determine existence of a specific* file/directory on a remote FTP server.* @author www.codejava.net**/
public class FTPCheckFileExists {private FTPClient ftpClient;private int returnCode;/*** Determines whether a directory exists or not* @param dirPath* @return true if exists, false otherwise* @throws IOException thrown if any I/O error occurred.*/boolean checkDirectoryExists(String dirPath) throws IOException {ftpClient.changeWorkingDirectory(dirPath);returnCode = ftpClient.getReplyCode();if (returnCode == 550) {return false;}return true;}/*** Determines whether a file exists or not* @param filePath* @return true if exists, false otherwise* @throws IOException thrown if any I/O error occurred.*/boolean checkFileExists(String filePath) throws IOException {InputStream inputStream = ftpClient.retrieveFileStream(filePath);returnCode = ftpClient.getReplyCode();if (inputStream == null || returnCode == 550) {return false;}return true;}/*** Connects to a remote FTP server*/void connect(String hostname, int port, String username, String password)throws SocketException, IOException {ftpClient = new FTPClient();ftpClient.connect(hostname, port);returnCode = ftpClient.getReplyCode();if (!FTPReply.isPositiveCompletion(returnCode)) {throw new IOException("Could not connect");}boolean loggedIn = ftpClient.login(username, password);if (!loggedIn) {throw new IOException("Could not login");}System.out.println("Connected and logged in.");}/*** Logs out and disconnects from the server*/void logout() throws IOException {if (ftpClient != null && ftpClient.isConnected()) {ftpClient.logout();ftpClient.disconnect();System.out.println("Logged out");}}/*** Runs this program*/public static void main(String[] args) {String hostname = "www.yourserver.com";int port = 21;String username = "your_user";String password = "your_password";String dirPath = "Photo";String filePath = "Music.mp4";FTPCheckFileExists ftpApp = new FTPCheckFileExists();try {ftpApp.connect(hostname, port, username, password);boolean exist = ftpApp.checkDirectoryExists(dirPath);System.out.println("Is directory " + dirPath + " exists? " + exist);exist = ftpApp.checkFileExists(filePath);System.out.println("Is file " + filePath + " exists? " + exist);} catch (IOException ex) {ex.printStackTrace();} finally {try {ftpApp.logout();} catch (IOException ex) {ex.printStackTrace();}}}
}

参考

https://www.codejava.net/java-se/ftp/how-to-start-ftp-programming-with-java

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Java使用apache commons连接ftp修改ftp文件名失败原因

改名

上传

下载

删除

检查文件/文件夹是否存在

参考

Java使用apache commons连接ftp修改ftp文件名失败原因相关推荐

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