java在进程启动和关闭.exe程序

/**
     * @desc 启动进程
     * @author zp
     * @date 2018-3-29
     */
    public static void startProc(String processName) {
         log.info("启动应用程序：" + processName);
         if (StringUtils.isNotBlank(processName)) {
             try {
                 Desktop.getDesktop().open(new File(processName));
             } catch (Exception e) {
                 e.printStackTrace();
                 log.error("应用程序：" + processName + "不存在！");
             }
         }
    }
    /**
     * @desc 杀死进程
     * @author zp
     * @throws IOException
     * @date 2018-3-29
     */
    public static void killProc(String processName) throws IOException {
        log.info("关闭应用程序：" + processName);
        if (StringUtils.isNotBlank(processName)) {
            executeCmd("taskkill /F /IM " + processName);
        }
    }
    /**
     * @desc 执行cmd命令
     * @author zp
     * @date 2018-3-29
     */
    public static String executeCmd(String command) throws IOException {
        log.info("Execute command : " + command);
        Runtime runtime = Runtime.getRuntime();
        Process process = runtime.exec("cmd /c " + command);
        BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream(), "UTF-8"));
        String line = null;
        StringBuilder build = new StringBuilder();
        while ((line = br.readLine()) != null) {
            log.info(line);
            build.append(line);
        }
        return build.toString();
    }
    /**
     * @desc 判断进程是否开启
     * @author zp
     * @date 2018-3-29
     */
    public static boolean findProcess(String processName) {
        BufferedReader bufferedReader = null;
        try {
            Process proc = Runtime.getRuntime().exec("tasklist -fi " + '"' + "imagename eq " + processName +'"');
            bufferedReader = new BufferedReader(new InputStreamReader(proc.getInputStream()));
            String line = null;
            while ((line = bufferedReader.readLine()) != null) {
                if (line.contains(processName)) {
                    return true;
                }
            }
            return false;
        } catch (Exception ex) {
            ex.printStackTrace();
            return false;
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (Exception ex) {}
            }
        }
    }

调用

            //downfile = "D:\\DownFile\\DownFile.exe";
            String url = request.getParameter("downfile");
            String procName = url.substring(url.lastIndexOf("\\")+1,url.length());
            boolean exist= findProcess(procName);
            try {
                if (exist) {
                    // 存在，那么就先杀死该进程
                    killProc(procName);
                    // 在启动
                    startProc(url);
                }else {
                    startProc(url);
                }
            } catch (Exception e) {
                // TODO: handle exception
                log.error("重启/杀死提取程序失败。。。");
            }