在java中从url中删除端口号

Question

我想用java编写一个函数，如果端口是默认端口，它将删除该端口

所以如果给予

String url80 = "http://www.somewhere.com:80/someplace";

它会回来的

String urlNo80 = "http://www.somewhere.com/someplace";

如果给予

String url443 = "https://www.somewhere.com:443/someplace";

它会回来的

String urlNo443 = "https://www.somewhere.com/someplace";

有比这更好的方法吗

public String removePortIfDefault(String inUrl) {
    String returnUrl = inUrl;
    if (inUrl.contains("http://") && inUrl.contains(":80")) {
        returnUrl = inUrl.replaceAll(":80", "");
    }
    if (inUrl.contains("https://") && inUrl.contains(":443")) {
        returnUrl = inUrl.replaceAll(":443", "");
    }
    return returnUrl;
}

Answer 1

可以将replaceFirst（或replaceAll）与正则表达式一起使用

String urlNo80 = url80.replaceFirst(":\\d+", "");

Answer 2

不要使用字符串操作来处理URL。Java有这样的类

String url80 = "http://www.somewhere.com:80/someplace";

// Using java.net.URI
URI uri = URI.create(url80);
uri = new URI(uri.getScheme(), uri.getHost(), uri.getPath(), uri.getFragment());
String urlNo80 = uri.toString(); // http://www.somewhere.com/someplace

// Using java.net.URL
URL url = new URL(url80);
url = new URL(url.getProtocol(), url.getHost(), url.getFile());
String urlNo80 = url.toString(); // http://www.somewhere.com/someplace