Java example: How to execute a process and read the output

Here is an example that shows how to execute a process (similar to typing a command at the command line), read the output of the process execution, and determine whether the execution succeeds based on the return value of the process. In general, a process that returns 0 indicates a successful execution and other values indicate failure.

Import java.io.*;

/**
* Example: Executing a process and returning a result
*/
public class Processexecutor {

public static final int SUCCESS = 0; Indicates successful program execution

public static final String COMMAND = "Java.exe-version"; The statement to execute

public static final String success_message = "program executed successfully!" ";

public static final String error_message = "Program execution error:";

public static void Main (string[] args) throws Exception {

Execute the program
Process process = Runtime.getruntime (). exec (COMMAND);

Print program output
Readprocessoutput (process);

Wait for program execution to end and output status
int exitCode = Process.waitfor ();

if (ExitCode = = SUCCESS) {
System.out.println (Success_message);
} else {
System.err.println (error_message + exitCode);
}
}

/**
* Print Process output
*
* @param process
*/
private static void Readprocessoutput (final process process) {
Prints the normal output of the process in System.out, and the error output of the process is printed in System.err
Read (Process.getinputstream (), System.out);
Read (Process.geterrorstream (), system.err);
}

Read input stream
private static void Read (InputStream inputstream, printstream out) {
try {
BufferedReader reader = new BufferedReader (new InputStreamReader (InputStream));

String Line;
while (line = Reader.readline ()) = null) {
Out.println (line);
}

} catch (IOException e) {
E.printstacktrace ();
} finally {

try {
Inputstream.close ();
} catch (IOException e) {
E.printstacktrace ();
}
}
}
Related
Java runs the system command line and gets the return value

Java example: How to execute a process and read the output