我在Windows 10 64x上為FTP TLS(org.apache.commons.net.ftp)運行了一個Java(1.8)程序：

FTPSClient ftpClient = new FTPSClient();

System.setProperty("https.protocols", "TLSv1,TLSv1.1,TLSv1.2");

// LISTENER

ftpClient.addProtocolCommandListener(

new PrintCommandListener(new PrintWriter(System.out), true));

ftpClient.connect(server);

ftpClient.login(user, pass);

// Enter local passive mode

ftpClient.enterLocalPassiveMode();

// useEpsvWithIPv4

ftpClient.setUseEPSVwithIPv4(true);

// Set protection buffer size

ftpClient.execPBSZ(0);

// Set data channel protection to private

ftpClient.execPROT("P");

System.setProperty("https.protocols", "TLSv1,TLSv1.1,TLSv1.2");

ftpClient.setTrustManager(TrustManagerUtils.getAcceptAllTrustManager());

ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

System.out.println("Remote system is " +

ftpClient.getEnabledCipherSuites());

System.out.println("SSL: " +

ftpClient.getEnableSessionCreation());

// PROTOCOLOS

String[] Protocols = ftpClient.getEnabledProtocols();

System.out.println("Protocols " + Protocols);

// AUTH

boolean Auth = ftpClient.getNeedClientAuth();

System.out.println("Auth: " + Auth);

ftpClient.getWantClientAuth();

ftpClient.getTrustManager();

ftpClient.feat();

// APPROACH #1: using retrieveFile(String, OutputStream)

String remoteFile1 = "/readme.txt";

File downloadFile1 = new File("C:\\readme.txt");

OutputStream outputStream1 = new BufferedOutputStream(new

FileOutputStream(downloadFile1));

ftpClient.retrieveFile(remoteFile1, outputStream1);

outputStream1.close();

對于第一個FTP服務器(Microsoft FTP服務)工作正常！ 調試：

run:

220 Microsoft FTP Service

AUTH TLS

234 AUTH command ok. Expecting TLS Negotiation.

USER *******

331 Password required for demo.

PASS *******

230 User logged in.

PBSZ 0

200 PBSZ command successful.

PROT P

200 PROT command successful.

TYPE I

200 Type set to I.

SSL: true

SYST

215 Windows_NT

Remote system is Windows_NT

Protocols [Ljava.lang.String;@3f2a3a5

Auth: false

FEAT

211-Extended features supported:

LANG EN*

UTF8

AUTH TLS;TLS-C;SSL;TLS-P;

PBSZ

PROT C;P;

CCC

HOST

SIZE

MDTM

REST STREAM

211 END

EPSV

229 Entering Extended Passive Mode (|||1025|)

RETR /readme.txt

125 Data connection already open; Transfer starting.

226 Transfer complete.

QUIT

221 Goodbye.

BUILD SUCCESSFUL (total time: 7 seconds)

對于第二個FTP服務器(FileZilla Server 0.9.59 beta)出錯，調試：

run:

220-FileZilla Server 0.9.59 beta

220-written by Tim Kosse (tim.kosse@filezilla-project.org)

220 Please visit https://filezilla-project.org/

AUTH TLS

234 Using authentication type TLS

USER *******

331 Password required for xxx

PASS *******

230 Logged on

PBSZ 0

200 PBSZ=0

PROT P

200 Protection level set to P

TYPE I

200 Type set to I

SSL: true

SYST

215 UNIX emulated by FileZilla

Remote system is UNIX emulated by FileZilla

Protocols [Ljava.lang.String;@246ae04d

Auth: false

FEAT

211-Features:

MDTM

REST STREAM

SIZE

MLST type*;size*;modify*;

MLSD

AUTH SSL

AUTH TLS

PROT

PBSZ

UTF8

CLNT

MFMT

EPSV

EPRT

211 End

EPSV

229 Entering Extended Passive Mode (|||14393|)

RETR /readme.txt

150 Opening data channel for file download from server of "/readme.txt"

Error: Remote host closed connection during handshake

javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake

QUIT

at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1002)

450 TLS session of data connection has not resumed or the session does not match the control connection

at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1385)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413)

at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1397)

at org.apache.commons.net.ftp.FTPSClient._openDataConnection_(FTPSClient.java:646)

at org.apache.commons.net.ftp.FTPClient._retrieveFile(FTPClient.java:1899)

at org.apache.commons.net.ftp.FTPClient.retrieveFile(FTPClient.java:1885)

at ftps.App_FTP.main(App_FTP.java:96)

Caused by: java.io.EOFException: SSL peer shut down incorrectly

at sun.security.ssl.InputRecord.read(InputRecord.java:505)

at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:983)

... 7 more

BUILD SUCCESSFUL (total time: 5 seconds)

使用FileZilla客戶端工作正常(下載/上傳文件)，但使用Java代碼我不能做什么只是連接和登錄。 有什么建議嗎？ 或任何其他自動FTP TLS的解決方案？

總結

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