java根据url获取完整域名

<div class="cnblogs_code">

        </span><span style="color: #0000ff;"&gt;if</span>(destination==<span style="color: #0000ff;"&gt;null</span>||destination.trim().equals(""<span style="color: #000000;"&gt;)){

     </span><span style="color: #0000ff;"&gt;return</span> ""<span style="color: #000000;"&gt;;

    }

    String domain </span>= ""<span style="color: #000000;"&gt;;

    URL url </span>=<span style="color: #0000ff;"&gt;null</span><span style="color: #000000;"&gt;;

    </span><span style="color: #0000ff;"&gt;try</span><span style="color: #000000;"&gt; {

        url</span>= <span style="color: #0000ff;"&gt;new</span><span style="color: #000000;"&gt; URL(destination);

        domain </span>=url.getProtocol()+"://"+<span style="color: #000000;"&gt;url.getHost();

    } </span><span style="color: #0000ff;"&gt;catch</span><span style="color: #000000;"&gt; (MalformedURLException e) {

        LOG.info(</span>"url=["+destination+"] not correct! "<span style="color: #000000;"&gt;);;

    }

    </span><span style="color: #0000ff;"&gt;return</span><span style="color: #000000;"&gt; domain;

   }</span></pre>