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apachecommons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
packagenet.codejava.ftp;
importjava.io.IOException;
importorg.apache.commons.net.ftp.FTPClient;
publicclassFTPRenamer{
publicstaticvoidmain(String[]args){
Stringserver="www.ftpserver.com";
intport=21;
Stringuser="username";
Stringpass="password";
FTPClientftpClient=newFTPClient();
try{
ftpClient.connect(server,port);
ftpClient.login(user,pass);
//renamingdirectory
StringoldDir="/photo";
StringnewDir="/photo_2012";
booleansuccess=ftpClient.rename(oldDir,newDir);
if(success){
System.out.println(oldDir+"wassuccessfullyrenamedto:"
+newDir);
}else{
System.out.println("Failedtorename:"+oldDir);
}
//renamingfile
StringoldFile="/work/error.png";
StringnewFile="/work/screenshot.png";
success=ftpClient.rename(oldFile,newFile);
if(success){
System.out.println(oldFile+"wassuccessfullyrenamedto:"
+newFile);
}else{
System.out.println("Failedtorename:"+oldFile);
}
ftpClient.logout();
ftpClient.disconnect();
}catch(IOExceptionex){
ex.printStackTrace();
}finally{
if(ftpClient.isConnected()){
try{
ftpClient.logout();
ftpClient.disconnect();
}catch(IOExceptionex){
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
//renamingfile
StringoldFile="/work/你好.png";
StringnewFile="/work/世界.png";
success=ftpClient.rename(
newString(oldFile.getBytes(StandardCharsets.UTF_8),StandardCharsets.ISO_8859_1),
newString(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
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.OutputStream;
importorg.apache.commons.net.ftp.FTP;
importorg.apache.commons.net.ftp.FTPClient;
/**
*Aprogramthatdemonstrateshowtouploadfilesfromlocalcomputer
*toaremoteFTPserverusingApacheCommonsNetAPI.
*@authorwww.codejava.net
*/
publicclassFTPUploadFileDemo{
publicstaticvoidmain(String[]args){
Stringserver="www.myserver.com";
intport=21;
Stringuser="user";
Stringpass="pass";
FTPClientftpClient=newFTPClient();
try{
ftpClient.connect(server,port);
ftpClient.login(user,pass);
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
//APPROACH#1:uploadsfirstfileusinganInputStream
FilefirstLocalFile=newFile("D:/Test/Projects.zip");
StringfirstRemoteFile="Projects.zip";
InputStreaminputStream=newFileInputStream(firstLocalFile);
System.out.println("Startuploadingfirstfile");
booleandone=ftpClient.storeFile(firstRemoteFile,inputStream);
inputStream.close();
if(done){
System.out.println("Thefirstfileisuploadedsuccessfully.");
}
//APPROACH#2:uploadssecondfileusinganOutputStream
FilesecondLocalFile=newFile("E:/Test/Report.doc");
StringsecondRemoteFile="test/Report.doc";
inputStream=newFileInputStream(secondLocalFile);
System.out.println("Startuploadingsecondfile");
OutputStreamoutputStream=ftpClient.storeFileStream(secondRemoteFile);
byte[]bytesIn=newbyte[4096];
intread=0;
while((read=inputStream.read(bytesIn))!=-1){
outputStream.write(bytesIn,0,read);
}
inputStream.close();
outputStream.close();
booleancompleted=ftpClient.completePendingCommand();
if(completed){
System.out.println("Thesecondfileisuploadedsuccessfully.");
}
}catch(IOExceptionex){
System.out.println("Error:"+ex.getMessage());
ex.printStackTrace();
}finally{
try{
if(ftpClient.isConnected()){
ftpClient.logout();
ftpClient.disconnect();
}
}catch(IOExceptionex){
ex.printStackTrace();
}
}
}
}
下载
importjava.io.BufferedOutputStream;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.OutputStream;
importorg.apache.commons.net.ftp.FTP;
importorg.apache.commons.net.ftp.FTPClient;
/**
*Aprogramdemonstrateshowtouploadfilesfromlocalcomputertoaremote
*FTPserverusingApacheCommonsNetAPI.
*@authorwww.codejava.net
*/
publicclassFTPDownloadFileDemo{
publicstaticvoidmain(String[]args){
Stringserver="www.myserver.com";
intport=21;
Stringuser="user";
Stringpass="pass";
FTPClientftpClient=newFTPClient();
try{
ftpClient.connect(server,port);
ftpClient.login(user,pass);
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
//APPROACH#1:usingretrieveFile(String,OutputStream)
StringremoteFile1="/test/video.mp4";
FiledownloadFile1=newFile("D:/Downloads/video.mp4");
OutputStreamoutputStream1=newBufferedOutputStream(newFileOutputStream(downloadFile1));
booleansuccess=ftpClient.retrieveFile(remoteFile1,outputStream1);
outputStream1.close();
if(success){
System.out.println("File#1hasbeendownloadedsuccessfully.");
}
//APPROACH#2:usingInputStreamretrieveFileStream(String)
StringremoteFile2="/test/song.mp3";
FiledownloadFile2=newFile("D:/Downloads/song.mp3");
OutputStreamoutputStream2=newBufferedOutputStream(newFileOutputStream(downloadFile2));
InputStreaminputStream=ftpClient.retrieveFileStream(remoteFile2);
byte[]bytesArray=newbyte[4096];
intbytesRead=-1;
while((bytesRead=inputStream.read(bytesArray))!=-1){
outputStream2.write(bytesArray,0,bytesRead);
}
success=ftpClient.completePendingCommand();
if(success){
System.out.println("File#2hasbeendownloadedsuccessfully.");
}
outputStream2.close();
inputStream.close();
}catch(IOExceptionex){
System.out.println("Error:"+ex.getMessage());
ex.printStackTrace();
}finally{
try{
if(ftpClient.isConnected()){
ftpClient.logout();
ftpClient.disconnect();
}
}catch(IOExceptionex){
ex.printStackTrace();
}
}
}
}
删除
importjava.io.IOException;
importorg.apache.commons.net.ftp.FTPClient;
importorg.apache.commons.net.ftp.FTPReply;
publicclassFTPDeleteFileDemo{
publicstaticvoidmain(String[]args){
Stringserver="www.myserver.com";
intport=21;
Stringuser="user";
Stringpass="pass";
FTPClientftpClient=newFTPClient();
try{
ftpClient.connect(server,port);
intreplyCode=ftpClient.getReplyCode();
if(!FTPReply.isPositiveCompletion(replyCode)){
System.out.println("Connectfailed");
return;
}
booleansuccess=ftpClient.login(user,pass);
if(!success){
System.out.println("Couldnotlogintotheserver");
return;
}
StringfileToDelete="/repository/video/cool.mp4";
booleandeleted=ftpClient.deleteFile(fileToDelete);
if(deleted){
System.out.println("Thefilewasdeletedsuccessfully.");
}else{
System.out.println("Couldnotdeletethefile,itmaynotexist.");
}
}catch(IOExceptionex){
System.out.println("Ohno,therewasanerror:"+ex.getMessage());
ex.printStackTrace();
}finally{
//logsoutanddisconnectsfromserver
try{
if(ftpClient.isConnected()){
ftpClient.logout();
ftpClient.disconnect();
}
}catch(IOExceptionex){
ex.printStackTrace();
}
}
}
}
检查文件/文件夹是否存在
packagenet.codejava.ftp;
importjava.io.IOException;
importjava.io.InputStream;
importjava.net.SocketException;
importorg.apache.commons.net.ftp.FTPClient;
importorg.apache.commons.net.ftp.FTPReply;
/**
*Thisprogramdemonstrateshowtodetermineexistenceofaspecific
*file/directoryonaremoteFTPserver.
*@authorwww.codejava.net
*
*/
publicclassFTPCheckFileExists{
privateFTPClientftpClient;
privateintreturnCode;
/**
*Determineswhetheradirectoryexistsornot
*@paramdirPath
*@returntrueifexists,falseotherwise
*@throwsIOExceptionthrownifanyI/Oerroroccurred.
*/
booleancheckDirectoryExists(StringdirPath)throwsIOException{
ftpClient.changeWorkingDirectory(dirPath);
returnCode=ftpClient.getReplyCode();
if(returnCode==550){
returnfalse;
}
returntrue;
}
/**
*Determineswhetherafileexistsornot
*@paramfilePath
*@returntrueifexists,falseotherwise
*@throwsIOExceptionthrownifanyI/Oerroroccurred.
*/
booleancheckFileExists(StringfilePath)throwsIOException{
InputStreaminputStream=ftpClient.retrieveFileStream(filePath);
returnCode=ftpClient.getReplyCode();
if(inputStream==null||returnCode==550){
returnfalse;
}
returntrue;
}
/**
*ConnectstoaremoteFTPserver
*/
voidconnect(Stringhostname,intport,Stringusername,Stringpassword)
throwsSocketException,IOException{
ftpClient=newFTPClient();
ftpClient.connect(hostname,port);
returnCode=ftpClient.getReplyCode();
if(!FTPReply.isPositiveCompletion(returnCode)){
thrownewIOException("Couldnotconnect");
}
booleanloggedIn=ftpClient.login(username,password);
if(!loggedIn){
thrownewIOException("Couldnotlogin");
}
System.out.println("Connectedandloggedin.");
}
/**
*Logsoutanddisconnectsfromtheserver
*/
voidlogout()throwsIOException{
if(ftpClient!=null&&ftpClient.isConnected()){
ftpClient.logout();
ftpClient.disconnect();
System.out.println("Loggedout");
}
}
/**
*Runsthisprogram
*/
publicstaticvoidmain(String[]args){
Stringhostname="www.yourserver.com";
intport=21;
Stringusername="your_user";
Stringpassword="your_password";
StringdirPath="Photo";
StringfilePath="Music.mp4";
FTPCheckFileExistsftpApp=newFTPCheckFileExists();
try{
ftpApp.connect(hostname,port,username,password);
booleanexist=ftpApp.checkDirectoryExists(dirPath);
System.out.println("Isdirectory"+dirPath+"exists?"+exist);
exist=ftpApp.checkFileExists(filePath);
System.out.println("Isfile"+filePath+"exists?"+exist);
}catch(IOExceptionex){
ex.printStackTrace();
}finally{
try{
ftpApp.logout();
}catch(IOExceptionex){
ex.printStackTrace();
}
}
}
}
参考
https://www.codejava.net/java-se/ftp/how-to-start-ftp-programming-with-java
总结
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