Below is my code，if i set the command as "ls ~/" I can get the output of
command ls by reading the input stream from channel.
if i set the command as "java -version", i can not get any output and the
exitcode is 0.
command = "ls ~/";
//command = "java -version";
InputStream in = null;
InputStream err = null;
BufferedReader inReader = null;
BufferedReader errReader = null;
try {
JSch jsch = new JSch();
Session session = jsch.getSession(user, host, port);
session.setUserInfo(userInfo);
session.setTimeout(timeout);
session.connect();
Channel channel = session.openChannel("exec");
((ChannelExec)channel).setCommand(command);
channel.setInputStream(null);
((ChannelExec)channel).setErrStream(null);
in = channel.getInputStream();
err = ((ChannelExec)channel).getErrStream();
channel.connect();
int exitCode = 0;
while(true) {
if(channel.isClosed()){
exitCode = channel.getExitStatus();
break;
}
try {
Thread.sleep(1000);
} catch (InterruptedException ie) {
}
}
inReader = new BufferedReader(new InputStreamReader(in));
errReader = new BufferedReader(new InputStreamReader(err));
if (exitCode != 0) {
while ((s = errReader.readLine()) != null) {
sb.append(s).append("\n");
}
status.setData(sb.toString());
} else {
while ((s = inReader.readLine()) != null) {
sb.append(s).append("\n");
}
System.out.println(sb.toString());
}
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