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java jsch 返回值_如何读取JSch命令输出?

燕和同
2023-12-01

小编典典

在等待命令完成的同时,必须连续读取输出。否则,如果命令产生足够的输出以填充输出缓冲区,则该命令将挂起,等待缓冲区被消耗,这将永远不会发生。这样您就陷入僵局。

以下示例在监视命令状态的同时连续读取stdout和stderr。它基于官方的JSch

exec.java示例(仅添加了stderr的阅读)。

ChannelExec channel = (ChannelExec)session.openChannel("exec");

channel.setCommand(

"for((i=1;i<=10000;i+=2)); do echo \"Long output - $i\"; done ; " +

"echo error output >&2");

InputStream commandOutput = channel.getExtInputStream();

StringBuilder outputBuffer = new StringBuilder();

StringBuilder errorBuffer = new StringBuilder();

InputStream in = channel.getInputStream();

InputStream err = channel.getExtInputStream();

channel.connect();

byte[] tmp = new byte[1024];

while (true) {

while (in.available() > 0) {

int i = in.read(tmp, 0, 1024);

if (i < 0) break;

outputBuffer.append(new String(tmp, 0, i));

}

while (err.available() > 0) {

int i = err.read(tmp, 0, 1024);

if (i < 0) break;

errorBuffer.append(new String(tmp, 0, i));

}

if (channel.isClosed()) {

if ((in.available() > 0) || (err.available() > 0)) continue;

System.out.println("exit-status: " + channel.getExitStatus());

break;

}

try {

Thread.sleep(1000);

} catch (Exception ee) {

}

}

System.out.println("output: " + outputBuffer.toString());

System.out.println("error: " + errorBuffer.toString());

channel.disconnect();

如果在while (!channel.isClosed()) {}之后添加channel.connect();,您会看到ishell

for循环中有足够大的空间(在我的环境中,10000就足够了),循环永远不会结束。

2020-09-09

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