ProcessBuilder getInputStream

exec : Java Glossary

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {

  public static void main(String[] args) throws IOException {
    String[] cmd = { "cmd", "/c", "dir" };
    File currentDirectory = new File("/");
    int exitValue = -1;
    String path = null;

    final StringBuilder sb = new StringBuilder();
    ProcessBuilder pb = new ProcessBuilder(cmd);
    pb = pb.redirectErrorStream(true);
    path = pb.environment().get("Path");
    pb.directory(currentDirectory);
    Process p = pb.start();
    final BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
    try {

      Thread t = new Thread(new Runnable() {
        public void run() {
          String line;
          try {
            while ((line = br.readLine()) != null) {
              sb.append(line).append('\n');
            }
          } catch (Exception e) {
            e.printStackTrace();
          }

        }
      });
      t.start();
      try {
        p.waitFor();
        t.join();
        exitValue = p.exitValue();
      }

      catch (InterruptedException e) {
        e.printStackTrace();
        Thread.currentThread().interrupt();
      }
    } finally {
      br.close();
      p.getOutputStream().close();
      p.getErrorStream().close();
    }

    System.out.println("PATH: " + path);
    System.out.println("Run Command: " + Arrays.toString(cmd));
    System.out.println("Current Directory: " + currentDirectory);
    System.out.println("exitValue: " + exitValue);
    System.out.println("stdout: ");
    System.out.println(sb);

    System.exit(0);
  }

}

/*
PATH: D:/java/jdk1.6.0_13/bin/...
Run Command: [cmd, /c, dir]
Current Directory: \
exitValue: 0
stdout: 
磁碟區 C 中的磁碟沒有標籤。
磁碟區序號:  0870-0C1B

C:\ 的目錄

2009/03/09  下午 01:45                 0 AUTOEXEC.BAT
2009/03/09  下午 01:45                 0 CONFIG.SYS
2009/03/20  上午 09:07    <DIR>          Documents and Settings
2009/03/23  下午 04:44    <DIR>          Program Files
...
*/