Java execute command get output example 2017-08-01 09:12
The getInputStream() method of Process return the result of what you executed. If there is an error when you invoke the command with Process, using getErrorStream() to get the information. The example code is here.
public class ExecuteCommand {
public static void main(String[] args) throws Exception {
Runtime rt = Runtime.getRuntime();
Process succProcess = rt.exec("echo hi");
if (succProcess.waitFor() == 0) {
System.out.println("command executed succ, output is like following:");
BufferedReader reader = new BufferedReader(new InputStreamReader(succProcess.getInputStream()));
String commandOutput = "";
while (commandOutput != null) {
commandOutput = reader.readLine();
System.out.println(commandOutput);
}
}
Process failProcess = rt.exec("ls --xxx");
if (failProcess.waitFor() != 0) {
System.out.println("command executed with error exit value:" + failProcess.exitValue() + ",error info is like following");
BufferedReader reader = new BufferedReader(new InputStreamReader(failProcess.getErrorStream()));
String commandOutput = "";
while (commandOutput != null) {
commandOutput = reader.readLine();
System.out.println(commandOutput);
}
}
}
}
output
command executed succ, output is like following:
hi
null
command executed with error exit value:2,error info is like following
ls: unrecognized option '--xxx'
Try `ls --help' for more information.
null
EOF