获取 urlclassloader 加载的 jar 文件的大小

发布于 2024-07-18 08:07:01 字数 426 浏览 7 评论 0原文

有人知道找到 urlclassloader 动态加载的文件大小的好方法吗？

我按以下方式使用 urlclassloader，但需要跟踪正在使用的带宽量。

URLClassLoader sysloader = (URLClassLoader) ClassLoader
            .getSystemClassLoader();
Class<URLClassLoader> sysclass = URLClassLoader.class;
Method method = sysclass.getDeclaredMethod("addURL", parameters);
method.setAccessible(true);
method.invoke(sysloader, (Object[]) urls);

提前致谢！

原文

Does anybody know a good way to find the file size that is dynamically loaded by urlclassloader?

I am using the urlclassloader in the following manner, but need to keep track of how much bandwidth is being used.

URLClassLoader sysloader = (URLClassLoader) ClassLoader
            .getSystemClassLoader();
Class<URLClassLoader> sysclass = URLClassLoader.class;
Method method = sysclass.getDeclaredMethod("addURL", parameters);
method.setAccessible(true);
method.invoke(sysloader, (Object[]) urls);

Thanks in advance!

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七禾 2024-07-25 08:07:01

如果您知道正在加载的 url 是 http url，并且可以确保它们所在的服务器返回 Content-Length 标头，则可以通过以下方式获取它们的大小：

public static int getContentLength (URL url)
    throws IOException
{
    String contentLength = url.openConnection().getHeaderField("Content-Length");
    if (contentLength == null) {
        throw new IllegalArgumentException(url + " didn't have a "
            + "Content-Length header");
    } else {
        return Integer.parseInt(contentLength);
    }
}

If you know the urls being loaded are http urls, and you can ensure the server they're on returns a Content-Length header, you can get their size with the following:

public static int getContentLength (URL url)
    throws IOException
{
    String contentLength = url.openConnection().getHeaderField("Content-Length");
    if (contentLength == null) {
        throw new IllegalArgumentException(url + " didn't have a "
            + "Content-Length header");
    } else {
        return Integer.parseInt(contentLength);
    }
}

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