Jsch如何重用会话

Question

我正在创建许多不同的(Session)对象,将登录凭据从Oracle pl/sql包传递给java类.然后,我将此(会话)对象存储在Vector中.我们的想法是连接,打开所需的频道,关闭频道,最后断开特定会话与此Vector的连接.我设法做到了,但它只为每个连接工作一次.我的意思是,在我的Vector(session1,session2,session3)中,当我调用session1.connect()然后调用session1.disconnect()时,我再也无法调用session1.connect(),因为它显然尝试了连接到服务器,但后来我得到:

检索存储在Vector中的会话我打开一个会话并获取:

INFO: Connecting to sftp.myserver.com port 2122
INFO: Connection established
INFO: Remote version string: SSH-2.0-OpenSSH_4.7
INFO: Local version string: SSH-2.0-JSCH-0.1.48
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-       cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: arcfour256 is not available.
INFO: CheckKexes: diffie-hellman-group14-sha1
INFO: diffie-hellman-group14-sha1 is not available.
INFO: SSH_MSG_KEXINIT sent
INFO: SSH_MSG_KEXINIT received
INFO: kex: server: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-  sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
INFO: kex: server: ssh-rsa,ssh-dss
INFO: kex: server: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
INFO: kex: server: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
INFO: kex: server: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
INFO: kex: server: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
INFO: kex: server: none,zlib@openssh.com
INFO: kex: server: none,zlib@openssh.com
INFO: kex: server: 
INFO: kex: server: 
INFO: kex: client: diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1
INFO: kex: client: ssh-rsa,ssh-dss
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96
INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha1-96,hmac-md5-96
INFO: kex: client: none
INFO: kex: client: none
INFO: kex: client: 
INFO: kex: client: 
INFO: kex: server->client aes128-ctr hmac-md5 none
INFO: kex: client->server aes128-ctr hmac-md5 none
INFO: SSH_MSG_KEXDH_INIT sent
INFO: expecting SSH_MSG_KEXDH_REPLY
INFO: ssh_rsa_verify: signature true
WARN: Permanently added 'sftp.myserver.com' (RSA) to the list of known hosts.
INFO: SSH_MSG_NEWKEYS sent
INFO: SSH_MSG_NEWKEYS received
INFO: SSH_MSG_SERVICE_REQUEST sent
INFO: SSH_MSG_SERVICE_ACCEPT received
INFO: Authentications that can continue: publickey,keyboard-interactive,password
INFO: Next authentication method: publickey
INFO: Authentications that can continue: password
INFO: Next authentication method: password
INFO: Authentication succeeded (password).
INFO: Disconnecting from sftp.myserver.com port 2122

一切都很好,最后我断开session1.

然后,当我再次尝试使用session1时,我得到以下异常......

INFO: Connecting to sftp.myserver.com port 2122
INFO: Connection established
INFO: Remote version string: SSH-2.0-OpenSSH_4.7
INFO: Local version string: SSH-2.0-JSCH-0.1.48
INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256
INFO: aes256-ctr is not available.
INFO: aes192-ctr is not available.
INFO: aes256-cbc is not available.
INFO: aes192-cbc is not available.
INFO: arcfour256 is not available.
INFO: CheckKexes: diffie-hellman-group14-sha1
INFO: diffie-hellman-group14-sha1 is not available.
INFO: SSH_MSG_KEXINIT sent
INFO: Disconnecting from sftp.myserver.com port 2122
com.jcraft.jsch.JSchException: Packet corrupt
at com.jcraft.jsch.Session.start_discard(Session.java:994)
at com.jcraft.jsch.Session.read(Session.java)
at com.jcraft.jsch.Session.connect(Session.java:288)
at com.jcraft.jsch.Session.connect(Session.java:162)
at sftp.make_dir(SFTP:118)

我在尝试重用java对象(Session)的方式上做错了吗？

非常感谢您的帮助

卢卡

Answer 1

com.jcraft.jsch.JSchException: Packet corrupt

内部发生了很多事情来建立连接.每次创建会话时,随机数(称为数据包)都与该会话相关联.此会话存储在JSCH会话池中.

断开会话时,将从池中删除会话,并使数据包无效.还有很多其他的事情发生,但这些2对于上面提到的错误消息最重要.

现在,当您尝试使用已断开连接的会话进行连接时,它找不到该数据包并抛出此错误.