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def resolve(String currentUrl, String redirectUrl) {
    URI newUri = new URI(redirectUrl);
    if (newUri.isAbsolute()) {
        return newUri.toString();
    } else {
        URI currentUri = new URI(currentUrl);
        return currentUri.resolve(newUri);
    }
}

println resolve("http://www.baidu.com/", "http://www.sina.com.cn/");
println resolve("http://www.sina.com/xx/aa.jpg", "/login.php");