public void testPing() throws IOException {  
        String address="220.181.111.147";  
          
        Process process = Runtime.getRuntime().exec("ping "+address);  
        InputStreamReader r = new InputStreamReader(process.getInputStream());  
        LineNumberReader returnData = new LineNumberReader(r);  
 
        String returnMsg="";  
        String line = "";  
        while ((line = returnData.readLine()) != null) {  
            System.out.println(line);  
            returnMsg += line;  
        }  
          
        if(returnMsg.indexOf("100% loss")!=-1){  
            System.out.println("与 " +address +" 连接不畅通.");  
        }  
        else{  
            System.out.println("与 " +address +" 连接畅通.");  
        }  
 
    }