java执行bat命令碰到的阻塞问题的解决方法

Runtime r=Runtime.getRuntime(); 
        Process p=null; 
        try{ 
            String path = "D:/test.bat"; 
     p = r.exec("cmd.exe /c  "+path); 
     p.waitFor(); 
 }catch(Exception e){  
     System.out.println("运行错误:"+e.getMessage()); 
     e.printStackTrace();  
} 

Runtime r=Runtime.getRuntime(); 
        Process p=null; 
        try{ 
            String path = "D:/test.bat"; 
     p = r.exec("cmd.exe /c  "+path); 
     StreamGobbler errorGobbler = new StreamGobbler(p.getErrorStream(), "ERROR");          
            errorGobbler.start(); 
            StreamGobbler outGobbler = new StreamGobbler(p.getInputStream(), "STDOUT"); 
            outGobbler.start(); 
     p.waitFor(); 
    }catch(Exception e){  
            System.out.println("运行错误:"+e.getMessage()); 
            e.printStackTrace();  
   } 

package com.test.tool; 

 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.PrintWriter; 

 
/**
 * 用于处理Runtime.getRuntime().exec产生的错误流及输出流
 */ 
public class StreamGobbler extends Thread { 
    InputStream is; 
    String type; 
    OutputStream os; 

    StreamGobbler(InputStream is, String type) { 
        this(is, type, null); 
    } 

    StreamGobbler(InputStream is, String type, OutputStream redirect) { 
        this.is = is; 
        this.type = type; 
        this.os = redirect; 
    } 

    public void run() { 
        InputStreamReader isr = null; 
        BufferedReader br = null; 
        PrintWriter pw = null; 
        try { 
            if (os != null) 
                pw = new PrintWriter(os); 

            isr = new InputStreamReader(is); 
            br = new BufferedReader(isr); 
            String line=null; 
            while ( (line = br.readLine()) != null) { 
                if (pw != null) 
                    pw.println(line); 
                System.out.println(type + ">" + line);     
            } 

            if (pw != null) 
                pw.flush(); 
        } catch (IOException ioe) { 
            ioe.printStackTrace();   
        } finally{ 
            try { 
                pw.close(); 
                br.close(); 
                isr.close(); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
        } 
    } 
}