[英]How do I do HTTP Purge from Java?
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?
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);
使用org.apache.httpcomponents 4.2.1:
类:
import org.apache.http.client.methods.HttpRequestBase;
import java.net.URI;
public class HttpPurge extends HttpRequestBase {
public final static String METHOD_NAME = "PURGE";
public HttpPurge() {
super();
}
@Override
public String getMethod() {
return METHOD_NAME; //To change body of implemented methods use File | Settings | File Templates.
}
public HttpPurge(final String uri) {
super();
setURI(URI.create(uri));
}
public String getName() {
return "PURGE";
}
}
电话:
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.util.EntityUtils;
import test.HttpPurge
private void callVarnish(URL url) {
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPurge httpPurge = new HttpPurge(url.toString());
Header header = new BasicHeader("Host", "www.somewhere.se");
httpPurge.setHeader(header);
try {
HttpResponse response = httpclient.execute(httpPurge);
System.out.print("-------------------------------------");
System.out.println(response.getStatusLine());
System.out.print("-------------------------------------");
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to worry about connection release
if (entity != null) {
// do something useful with the response body
// and ensure it is fully consumed
EntityUtils.consume(entity);
}
} catch (IOException ex) {
// In case of an IOException the connection will be released
// back to the connection manager automatically
} catch (RuntimeException ex) {
// In case of an unexpected exception you may want to abort
// the HTTP request in order to shut down the underlying
// connection and release it back to the connection manager.
httpPurge.abort();
}
}
已弃用的org.apache.commons.httpclient.HttpMethodBase:
类:
import org.apache.commons.httpclient.HttpMethodBase;
public class PurgeMethod extends HttpMethodBase {
public PurgeMethod() {
super();
setFollowRedirects(true);
}
public PurgeMethod(String url) {
super(url);
setFollowRedirects(true);
}
public String getName() {
return "PURGE";
}
}
电话:
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
private void callVarnish(URL url) {
HttpClient client = new HttpClient();
HttpMethod method = new PurgeMethod(url.toString());
try {
int status = 0;
status = client.executeMethod(method);
log.debug(status);
} catch (Exception e) {
// something
} finally {
method.releaseConnection();
}
}
使用HttpComponents,API已发生变化。 当前版本的uldall的答案如下:
HttpHost host = new HttpHost(hostname, port);
HttpClient httpclient = HttpClientBuilder.create().build();
BasicHttpRequest purgeRequest = new BasicHttpRequest("PURGE", "/some/url");
HttpResponse response = httpclient.execute(host, purgeRequest);
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