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четвер, 13 лютого 2014 р.

Run console command from Java

To run console command from java do the following:

1. Command interpreter string:
 private static final String[] COMMAND_INTERPRETER = {"cmd", "/C"}; // For MS Dos and Windows
 private static final String[] COMMAND_INTERPRETER = {"/bin/sh","-c"}; // For Unix (Linux)

2. Method to start system process:
public static String startProcess(String command, String dir) throws IOException {
StringBuffer ret = new StringBuffer();
String[] comm = new String[3];
comm[0] = COMMAND_INTERPRETER[0];
comm[1] = COMMAND_INTERPRETER[1];
comm[2] = command;
long start = System.currentTimeMillis();
try {
//Start process
Process ls_proc = Runtime.getRuntime().exec(comm, null, new File(dir));
//Get input and error streams
BufferedInputStream ls_in = new BufferedInputStream(ls_proc.getInputStream());
BufferedInputStream ls_err = new BufferedInputStream(ls_proc.getErrorStream());
boolean end = false;
while (!end) {
int c = 0;
while ((ls_err.available() > 0) && (++c <= 1000)) {
ret.append(conv2Html(ls_err.read()));
}
c = 0;
while ((ls_in.available() > 0) && (++c <= 1000)) {
ret.append(conv2Html(ls_in.read()));
}
try {
ls_proc.exitValue();
//if the process has not finished, an exception is thrown
//else
while (ls_err.available() > 0)
ret.append(conv2Html(ls_err.read()));
while (ls_in.available() > 0)
ret.append(conv2Html(ls_in.read()));
end = true;
}
catch (IllegalThreadStateException ex) {
//Process is running
}
//The process is not allowed to run longer than given time.
if (System.currentTimeMillis() - start > MAX_PROCESS_RUNNING_TIME) {
ls_proc.destroy();
end = true;
ret.append("!!!! Process has timed out, destroyed !!!!!");
}
try {
Thread.sleep(50);
}
catch (InterruptedException ie) {}
}
}
catch (IOException e) {
ret.append("Error: " + e);
}
return ret.toString();
}


(Source code taken from this app)

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