绝对不使用计时器为此！对于一次性运行的桌面应用程序来说很有趣，但是在长期运行的Java EE Web应用程序中使用它时会遇到严重的潜在问题。

Do absolutely not use Timer for this! It's funny for one-time-run desktop applications, but it has severe potential problems when used in a lifetime long running Java EE web application.

而是使用来自 java.util .concurrent 包。这是一个启动示例：

Rather use the executors from the java.util.concurrent package. Here's a kickoff example:

ExecutorService executor = Executors.newSingleThreadExecutor(); // An application wide thread pool executor is better.

Callable<InputStream> task = new Callable<InputStream>() {
    @Override
    public InputStream call() throws Exception {
        // Do here your webservice call job.
        return new URL("http://***.com").openStream();
    }
};

try {
    InputStream input = executor.invokeAny(Arrays.asList(task), 60, TimeUnit.SECONDS);
    // Successful! Forward to success page here.
} catch (TimeoutException e) {
    // Timeout occurred. Forward to timeout page here.
}