在Java中，有多接近连接并使用HttpURLConnection释放端口/套接字？

问题描述

我正在使用HttpURLConnection来下载Java中的页面。我忘了发布连接，我认为这给我的系统造成了一些问题（一个网络浏览器）。

I'm using HttpURLConnection to do download of pages in Java. I forgot to release the connections and I think this was causing some problems to my system (a webcrawler).

现在我做了一些测试，看到断开后，在Windows上的 netstat 命令的结果中，某些连接仍然像TIME_WAIT。

Now I've done some tests and see that after disconnecting, some connections still like TIME_WAIT in the results from the netstat command on Windows.

如何释放此连接马上？

示例代码：

private HttpURLConnection connection;

boolean openConnection(String url) {
    try {
        URL urlDownload = new URL(url);
        connection = (HttpURLConnection) urlDownload.openConnection();
        connection.setInstanceFollowRedirects(true);
        connection.connect();
        connection.disconnect();
        return true;
    } catch (Exception e) {
        System.out.println(e);
        return false;
    }
}

推荐答案

In某些实现，如果您已调用 getInputStream 或 getOutputStream ，则需要确保关闭这些流。否则，即使在调用 disconnect 之后连接也可以保持打开状态。

In some implementations, if you have called getInputStream or getOutputStream, you need to ensure that those streams are closed. Otherwise, the connection can stay open even after calling disconnect.

编辑：

这是来自对于HttpURLConnection [强调添加]：

This is from the J2SE docs for HttpURLConnection [emphasis added]:

这是来自：

我不知道知道你正在使用什么平台，但它可能有类似的行为。

I don't know what platform you are using, but it could have similar behavior.

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