是否在JDK中定义了HTTP和HTTPS默认端口号？ [英] Are HTTP and HTTPS default port numbers defined in the JDK?

问题描述

我试图查看端口80和端口443是否被定义为公共常量。这些是否存在于JDK中（或者可能存在于Apache HttpClient等公共库中）？

I've hunted around a bit trying to see if port 80 and port 443 are defined as public constants anywhere. Do these exist in the JDK (or perhaps in a common library such as Apache HttpClient)?

推荐答案

查看Javadoc的URL： http://docs.oracle。 com / javase / 8 / docs / api / java / net / URL.html＃getDefaultPort--

Look at Javadoc for URL: http://docs.oracle.com/javase/8/docs/api/java/net/URL.html#getDefaultPort--

getDefaultPort（）返回给定协议的端口

URL url = new URL("http://blah.com");
int defaultPort = url.getDefaultPort();

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