如何在使用Apache VFS时在JSch Session上设置KEX

我正在使用Apache VFS 2.1和JSch 0.1.54 （今天的最新版本）来使用SFTP上传文件。

连接时系统抛出“IO流读取结束” ，完整堆栈为：

 Caused by: com.jcraft.jsch.JSchException: Session.connect: java.io.IOException: End of IO Stream Read at com.jcraft.jsch.Session.connect(Session.java:565) at com.jcraft.jsch.Session.connect(Session.java:183) at org.apache.commons.vfs2.provider.sftp.SftpClientFactory.createConnection(SftpClientFactory.java:166) 

我在这个post中找到了一个可能解决我问题的方法，但它直接用JSch操作。 由于我使用的是Apache VFS，我无法直接访问Session （至少我认为我不能）。

但如果可以，它看起来像这样：

 session.setConfig("kex", "diffie-hellman-group1-sha1"); 

查看Apache VFS实现org.apache.commons.vfs2.provider.sftp.SftpClientFactory它没有找到设置此属性的方法。

如何使用Apache VFS API设置此配置？

更新

日志数据：

 22/05/2017 09:27:20 org.apache.commons.vfs2.impl.StandardFileSystemManager info INFO: Using "D:\Users\TECBMEPI\AppData\Local\Temp\vfs_cache" as temporary files store. 22/05/2017 09:27:20 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: Connecting to z1t1brmxpta022 port 22 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: Connection established 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: Remote version string: SSH-2.0-OpenSSH_6.6.1 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: Local version string: SSH-2.0-JSCH-0.1.54 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: aes256-ctr is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: aes192-ctr is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: aes256-cbc is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: aes192-cbc is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: CheckKexes: diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: diffie-hellman-group14-sha1 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: ecdh-sha2-nistp256 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: ecdh-sha2-nistp384 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: ecdh-sha2-nistp521 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: ecdsa-sha2-nistp256 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: ecdsa-sha2-nistp384 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: ecdsa-sha2-nistp521 is not available. 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: SSH_MSG_KEXINIT sent 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: SSH_MSG_KEXINIT received 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: [e-mail],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[e-mail],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail] 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[e-mail],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[e-mail] 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-md5,hmac-sha1,[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: [e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],[e-mail],hmac-md5,hmac-sha1,[e-mail],[e-mail],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[e-mail],hmac-sha1-96,hmac-md5-96 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: none,[e-mail] 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: none,[e-mail] 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server: 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: ssh-rsa,ssh-dss 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: none 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: none 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client: 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: server->client aes128-ctr hmac-md5 none 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: kex: client->server aes128-ctr hmac-md5 none 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: SSH_MSG_KEX_DH_GEX_REQUEST(1024<1024<1024) sent 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: expecting SSH_MSG_KEX_DH_GEX_GROUP 22/05/2017 09:27:21 org.apache.commons.vfs2.provider.sftp.SftpClientFactory log INFO: Disconnecting from z1t1brmxpta022 port 22 

Answer 1

JSch Session从其JSch实例inheritance设置。 并且所有JSch实例实际上都与设置共享相同的全局/静态哈希表。

所以只需在SftpClientFactory.createConnection之前调用静态SftpClientFactory.createConnection ：

 JSch.setConfig("kex", "diffie-hellman-group1-sha1");