java程序与其他进程的数据通信

                                       
1）  java程序与其他进程的通信
package IO;
 
import java.io.*;
 
import sun.security.provider.SystemSigner;
public class TestInOut implements Runnable {
 
    Process p=null;//设置一个空进程
    public TestInOut()
    {
       try {
           p=Runtime.getRuntime().exec("java MyTest");//遇到问题，无法执行
           new Thread(this).start();   //启动接收流的对象
       } catch (Exception e) {
           e.printStackTrace();
       }
      
    }
    public static void main(String[] args) {
       TestInOut tio=new TestInOut();//实例化主程序，调用构造函数，开启读取数据进程
       tio.send();//开启输入数据方法
      
    }
    public void send()
    {
       try {
           OutputStream ops=p.getOutputStream();//定义输出流
           while (true) {
              ops.write("help/r/n".getBytes());//写入数据
           }
       } catch (Exception e) {
           e.printStackTrace();
       }
 
    }
    public void run()
    {
      
       try {
           int count=0;
           InputStream ips=p.getInputStream();//获得输入流
           BufferedReader bfr=new BufferedReader(new InputStreamReader(ips));//包装输入流，按行读出
           while (true) {
              count++;
             
10c05
if(count>50)
              {
                  break;
              }
              String strLine= bfr.readLine();//按行读取内存
              System.out.println(strLine);//打印输出行？
 
           }
          
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
    }
}
调用的进程
package IO;
import java.io.*;
public class MyTest {
 
    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
       // TODO Auto-generated method stub
       BufferedReader bfr=new BufferedReader(new InputStreamReader(System.in));    
       while (true) {
           //System.out.println("我来了");
           String strLine=bfr.readLine();
           if(strLine!=null)
           {
              System.out.println("hi:"+strLine);
           }
           else {
              return;
           }
       }
    }
 
}
问题分析：子进程不能执行
2）  把异常的字符串信息包装后发送出去
package IO;
import java.io.*;
public class TestPrintWriter {
 
 
    public static void main(String[] args) {
       try {
           throw new Exception("test");//抛出的异常
       } catch (Exception e) {
           StringWriter sw=new StringWriter();//声明字符串写入流
           PrintWriter pw=new PrintWriter(sw);//包装
           e.printStackTrace(pw);//输出异常流
           System.out.println(sw.toString());
           System.out.println(e.getMessage());
       }
 
    }
}