如何在java中拆分字符串url

Question

I wonder how I can split string url to host and port. Suppose I have

 String http://localhost:1213 

and I want to have host= "localhost" and port (as integer or long) = 1213.

I did this:

     String[] parts = URL.split(":");
     String HOST = parts[0]; 
     String PORT = parts[1];

but it gave me: HOST = htp// and PORT = localhost obviously since it splitted till ":" Any help of how to get them in a correct way and have port as long instead of string?

Answer 1

You could use the URL class, which will also give you validation to ensure your url is correct.

It has a getHost and a getPort method that give you exactly what you need.

URL u = new URL(VAC_URL);
String host = u.getHost();
int port = u.getPort();

The constructor will throw an exception if the URL is not valid.

Answer 2

If you want to get return your host with protocol and port, example: " http://127.0.0.1 " and "9090" so here is the function I have Created check it up...

public static String[] divideHostPort(String hostWithPort) {

    String hostProtocol;
    String[] urlParts = new String[2];


    if (hostWithPort.startsWith("http://")) {
        hostProtocol = "http://";
        hostWithPort = hostWithPort.replace(hostProtocol, "");

        if (hostWithPort.split(":").length == 2) {

            urlParts[0] = hostProtocol + hostWithPort.split(":")[0];
            urlParts[1] = hostWithPort.split(":")[1];

        } else {
            urlParts[0] = hostProtocol +hostWithPort;
            urlParts[1] = "80";
        }


        return urlParts;

    } else if (hostWithPort.startsWith("https://")) {
        hostProtocol = "https://";
        hostWithPort = hostWithPort.replace(hostProtocol, "");

        if (hostWithPort.split(":").length == 2) {

            urlParts[0] = hostProtocol + hostWithPort.split(":")[0];
            urlParts[1] = hostWithPort.split(":")[1];

        } else {
            urlParts[0] = hostProtocol + hostWithPort;
            urlParts[1] = "80";
        }


        return urlParts;
    } else {

        hostProtocol = "http://";

        if (hostWithPort.split(":").length == 2) {

            urlParts[0] = hostProtocol + hostWithPort.split(":")[0];
            urlParts[1] = hostWithPort.split(":")[1];

        } else {
            urlParts[0] = hostProtocol + hostWithPort;
            urlParts[1] = "80";
        }


        return urlParts;

    }


}

Call it Like String arr[]=divideHostPort("http://127.0.0.1:9090")

to retrieve both details use array like String host=arr[0] and String port=arr[1]

Answer 3

 String s= http://localhost:1213
 String[] parts = s.split(":");
 String HOST = parts[1].replaceAll("//",""); // part[0] is http, part[1] is //localhost, part[2] is 1213
 String PORT = parts[2];

Answer 4

Just use Integer.parseInt() for the port variable:

 String[] parts = VAC_URL.split(":");
 String HOST = parts[1].replaceAll("//","");
 int PORT = Integer.parseInt(parts[2]);

or to have it as long use this instead:

long PORT = Long.valueOf(parts[2]).longValue();