Building an absolute URL from a relative URL in Java

Question

I\'m having trouble building an absolute URL from a relative URL without resorting to String hackery...

Given

http://localhost:8080/myWebApp/someSer         


        

Answer 1

Using java.net.URL

 URL baseUrl = new URL("http://www.google.com/someFolder/");
 URL url = new URL(baseUrl, "../test.html");

Answer 2

Looks like you already figured out the hard part, which is what host your are running on. The rest is easy,

String url = host + request.getContextPath() + "/someImage.jpg";

Should give you what you need.

Answer 3

How about:

String s = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/someImage.jpg";

Answer 4

this code work will on linux, it can just combine the path, if you want more, constructor of URI could be helpful.

URL baseUrl = new URL("http://example.com/first");
URL targetUrl = new URL(baseUrl, Paths.get(baseUrl.getPath(), "second", "/third", "//fourth//", "fifth").toString());

if you path contain something need to escape, use URLEncoder.encode to escape it at first.

URL baseUrl = new URL("http://example.com/first");
URL targetUrl = new URL(baseUrl, Paths.get(baseUrl.getPath(), URLEncoder.encode(relativePath, StandardCharsets.UTF_8), URLEncoder.encode(filename, StandardCharsets.UTF_8)).toString());

example:

import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
public class Main {
    public static void main(String[] args) {
        try {
            URL baseUrl = new URL("http://example.com/first");
            Path relativePath = Paths.get(baseUrl.getPath(), "second", "/third", "//fourth//", "fifth");
            URL targetUrl = new URL(baseUrl, relativePath.toString());
            System.out.println(targetUrl.toString());
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
    }
}

output

http://example.com/first/second/third/fourth/fifth

baseUrl.getPath() are very important, don't forget it.

a wrong example:

import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Path;
import java.nio.file.Paths;
public class Main {
    public static void main(String[] args) {
        try {
            URL baseUrl = new URL("http://example.com/first");
            Path relativePath = Paths.get("second", "/third", "//fourth//", "fifth");
            URL targetUrl = new URL(baseUrl, relativePath.toString());
            System.out.println(targetUrl.toString());
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
    }
}

output

http://example.com/second/third/fourth/fifth

we have lost our /first in baseurl.