Jsch - 一个会话多个频道 [英] Jsch - One Session Multiple Channels
问题描述
我设法通过ssh用Jsch执行单个命令但是当我尝试执行第二个命令时它失败
I managed to execute a single command through ssh with Jsch but when i try to execute a second command it fails
对于调试我把这个问题带到了这一行:
For debugging i brought this problem down to this lines:
import java.io.IOException;
import java.io.InputStream;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
public class Exec {
public static void test(Session session) throws Exception {
Channel channel = session.openChannel("exec");
((ChannelExec) channel).setCommand("pwd");
channel.setInputStream(null);
((ChannelExec) channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
channel.connect();
byte[] tmp = new byte[1024];
while (true) {
while (in.available() > 0) {
int i = in.read(tmp, 0, 1024);
if (i < 0)
break;
System.out.print(new String(tmp, 0, i));
}
if (channel.isClosed()) {
System.out.println("exit-status: " + channel.getExitStatus());
break;
}
try {
Thread.sleep(1000);
} catch (Exception ee) {
}
}
channel.disconnect();
}
public static void main(String[] arg) {
try {
JSch jsch = new JSch();
Session session = jsch.getSession("nck", "127.0.0.1", 22);
session.setPassword("asd");
session.setConfig("StrictHostKeyChecking", "no");
session.connect();
test(session); // This one succeeds with exit-status: 0
test(session); // This one fails with exit-status: 255
session.disconnect();
} catch (Exception e) {
//
}
}
}
这主要是官方的Exec示例,但这给了我这个输出:
This is mostly the official Exec example but this gives me this output:
/home/nck
exit-status: 0
exit-status: 255
第一个命令成功执行第二个不执行。
The first command is executed succesfully the second doesnt.
任何想法?
推荐答案
嘿,我和jsch和Ubuntu有同样的问题。 (怎么样)你解决了吗?为每次执行创建一个新会话会占用太多时间吗?目前我捕获了jsch异常并搜索session is not down然后我重新连接会话并再次执行命令。这可行,但不是一个好的解决方案。
Hey I have exactly the same problem with jsch and Ubuntu. (How) did you solve it? Making a new session for every execute eats too much time? At the moment I catch the jsch exception and search for "session isn't down" then I reconnect the session and execute command again. That works but is not a good solution.
编辑:我错了,我现在通过使用
I was on the wrong way I solved my problem for now by using
channel = session.openChannel(shell);
而不是exec。
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