如何从Java进行HTTP清除？

Question

我正在尝试使用HttpUrlConnection执行PURGE,如下所示:

private void callVarnish(URL url) {
    HttpURLConnection conn = null;

    try {
        conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod(PURGE_METHOD);
        conn.setDoOutput(true);
        conn.setInstanceFollowRedirects(true);
        conn.setRequestProperty("Host", "www.somehost.com");
        conn.connect();
        System.out.print(conn.getResponseCode() + " " + conn.getResponseMessage());
     }
     catch (Exception e) {
         log.error("Could not call varnish: " + e);
     } finally {
         if (conn != null) {
             conn.disconnect();
         }
     }
}

但是我得到了:

08:56:31,813 ERROR [VarnishHandler] Could not call varnish: java.net.ProtocolException: Invalid HTTP method: PURGE

卷曲没有问题:

curl -I -X PURGE -H"主持人:www.somehost.com"someurl

HTTP/1.1 404 Not in cache.
Server: Varnish
Content-Type: text/html; charset=utf-8
Retry-After: 5
Content-Length: 401
Accept-Ranges: bytes
Date: Thu, 18 Oct 2012 06:40:19 GMT
X-Varnish: 1611365598
Age: 0
Via: 1.1 varnish
Connection: close
X-Cache: MISS

那我该怎么做？我是否需要从Java卷曲或是否有其他我可以使用的库？

Answer 1

您可以使用Apache的HttpClient库:http://hc.apache.org/httpcomponents-client-ga/

您可以使用BasicHttpRequest或实现自己的扩展HttpRequestBase的HttpPurge类.

您可以在此处找到快速入门指南:http://hc.apache.org/httpcomponents-client-ga/quickstart.html

例:

DefaultHttpClient httpclient = new DefaultHttpClient();
BasicHttpRequest httpPurge = new BasicHttpRequest("PURGE", "www.somehost.com") 
HttpResponse response = httpclient.execute(httpPurge);