exec String shell command - Java Native OS

Java examples for Native OS:Shell Command

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Description

exec String shell command

Demo Code


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main{
    public static void main(String[] argv) throws Exception{
        String cmd = "java2s.com";
        exec(cmd);//from w ww  .j  a v  a 2 s.  c  o  m
    }
    public static void exec(String cmd) throws IOException {
        System.out.println("Executing: ");
        System.out.println(cmd);
        Process process = Runtime.getRuntime().exec(cmd);

        BufferedReader stdout = new BufferedReader(new InputStreamReader(
                process.getInputStream()));
        BufferedReader stderr = new BufferedReader(new InputStreamReader(
                process.getErrorStream()));

        String output;
        StringBuilder sb_output = new StringBuilder("Cmd output:\n");
        for (String line; (line = stdout.readLine()) != null;)
            sb_output.append(line).append("\n");

        output = sb_output.toString();
        System.out.println(output);

        int exitStatus = 0;
        try {
            exitStatus = process.waitFor();
        } catch (InterruptedException e) {
          
        }
        System.out.println("Cmd exit status: " + exitStatus);
        if (exitStatus != 0) {
            StringBuilder sb = new StringBuilder();
            for (String line; (line = stderr.readLine()) != null;)
                sb.append(line).append("\n");

            System.err.println("Cmd exited with error status.  "
                    + exitStatus + " stderr:\n" + sb.toString());
            stdout.close();
            stderr.close();
            throw new Error("Clustering failed");
        }
        stdout.close();
        stderr.close();
    }
}

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