进程控制

当你需要在Java内部执行其他操作系统的程序，并且要控制这些程序的输入和输出，一项常见任务是运行程序，并将产生的输出发送到控制台。
代码例子：

//自定义异常public class OSExecuteException extends RuntimeException {      public OSExecuteException(String why) { super(why); }    }    public class OSExecute {      public static void command(String command) {        boolean err = false;        try {            //获得程序进程          Process process =            new ProcessBuilder(command.split(" ")).start();          //获得进程输入流          BufferedReader results = new BufferedReader(            new InputStreamReader(process.getInputStream()));          String s;          while((s = results.readLine())!= null)            System.out.println(s);          //获得进程错误输入流          BufferedReader errors = new BufferedReader(            new InputStreamReader(process.getErrorStream()));          while((s = errors.readLine())!= null) {            System.err.println(s);            err = true;          }        } catch(Exception e) {            //windows2000 命令符          if(!command.startsWith("CMD /C"))            command("CMD /C " + command);          else            throw new RuntimeException(e);        }        if(err)          throw new OSExecuteException("Errors executing " +            command);      }    }     //执行函数public class OSExecuteDemo {      public static void main(String[] args) {          //反编译class文件        OSExecute.command("javap  D:/AndroidProject/thinking18/bin/beyondboy/OSExecuteDemo.class");      }    } 

运行结果：
Compiled from “OSExecuteDemo.java”
public class beyondboy.OSExecuteDemo {
public beyondboy.OSExecuteDemo();
public static void main(java.lang.String[]);
}