public static boolean checkPidExist(Integer pid) throws IOException{
        String sPid = String.valueOf(pid);
        Process proc = Runtime.getRuntime().exec("ps -p " + sPid);
        InputStream ins = proc.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(ins));
        String sTemp;
        while ((sTemp = br.readLine()) != null) {
            if (sTemp.contains(sPid)) {
                return true;
            }
        }
        return false;
    }

    private boolean checkPidExist(Integer pid)  throws Exception{
        BufferedReader br = null;
        try {
            boolean result = false;
            String sPid = String.valueOf(pid);
            Process proc = Runtime.getRuntime().exec("ps -p " + sPid);
            InputStream ins = proc.getInputStream();
            br = new BufferedReader(new InputStreamReader(ins));
            String sTemp;
            while ((sTemp = br.readLine()) != null) {
                if (sTemp.contains(sPid)) {
                    result = true;
                }
            }
            proc.waitFor();
            return result;
        } 
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    log.error("can not close stream ", e);
                }
            }

        }

    }