Runtime模拟cmd常用命令

import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.Scanner;

public class RuntimeTest {
	public static void main(String[] args) {
		String command = null;
		System.out.print("please enter:");

		Scanner sc = new Scanner(System.in);
		command = sc.nextLine().trim();

		while (!command.equalsIgnoreCase("exit")) {
			if (!command.equals("")) {
				System.out.println("the result is:");

				try {
					// 根据指令返回进程
					Process ps = Runtime.getRuntime().exec(command);
					// 获取该进程返回的数据流
					InputStreamReader in = new InputStreamReader(ps
							.getInputStream());
					// 读该数据流
					LineNumberReader line = new LineNumberReader(in);
					String str = null;
					while ((str = line.readLine()) != null) {
						System.out.println(str);
					}
				} catch (Exception ex) {
					System.out.println("'" + command
							+ "' 不是内部或外部命令，也不是可运行的程序或批处理文件。");
				}
				System.out.println();
			}
			System.out.print("please enter:");
			command = sc.nextLine().trim();
		}
		System.out.println("you have exited");
	}
}