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    <p>imho: <a href="http://hc.apache.org/httpclient-3.x/" rel="noreferrer">Apache HTTP Client</a></p> <p>usage example:</p> <pre><code>import org.apache.commons.httpclient.*; import org.apache.commons.httpclient.methods.*; import org.apache.commons.httpclient.params.HttpMethodParams; import java.io.*; public class HttpClientTutorial { private static String url = "http://www.apache.org/"; public static void main(String[] args) { // Create an instance of HttpClient. HttpClient client = new HttpClient(); // Create a method instance. GetMethod method = new GetMethod(url); // Provide custom retry handler is necessary method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3, false)); try { // Execute the method. int statusCode = client.executeMethod(method); if (statusCode != HttpStatus.SC_OK) { System.err.println("Method failed: " + method.getStatusLine()); } // Read the response body. byte[] responseBody = method.getResponseBody(); // Deal with the response. // Use caution: ensure correct character encoding and is not binary data System.out.println(new String(responseBody)); } catch (HttpException e) { System.err.println("Fatal protocol violation: " + e.getMessage()); e.printStackTrace(); } catch (IOException e) { System.err.println("Fatal transport error: " + e.getMessage()); e.printStackTrace(); } finally { // Release the connection. method.releaseConnection(); } } } </code></pre> <p>some highlight features:</p> <ul> <li>Standards based, pure Java, implementation of HTTP versions 1.0 and 1.1 <ul> <li>Full implementation of all HTTP methods (GET, POST, PUT, DELETE, HEAD, OPTIONS, and TRACE) in an extensible OO framework.</li> <li>Supports encryption with HTTPS (HTTP over SSL) protocol.</li> <li>Granular non-standards configuration and tracking.</li> <li>Transparent connections through HTTP proxies.</li> <li>Tunneled HTTPS connections through HTTP proxies, via the CONNECT method.</li> <li>Transparent connections through SOCKS proxies (version 4 &amp; 5) using native Java socket support.</li> <li>Authentication using Basic, Digest and the encrypting NTLM (NT Lan Manager) methods.</li> <li>Plug-in mechanism for custom authentication methods.</li> <li>Multi-Part form POST for uploading large files.</li> <li>Pluggable secure sockets implementations, making it easier to use third party solutions</li> <li>Connection management support for use in multi-threaded applications. Supports setting the maximum total connections as well as the maximum connections per host. Detects and closes stale connections.</li> <li>Automatic Cookie handling for reading Set-Cookie: headers from the server and sending them back out in a Cookie: header when appropriate.</li> <li>Plug-in mechanism for custom cookie policies.</li> <li>Request output streams to avoid buffering any content body by streaming directly to the socket to the server.</li> <li>Response input streams to efficiently read the response body by streaming directly from the socket to the server.</li> <li>Persistent connections using KeepAlive in HTTP/1.0 and persistance in HTTP/1.1</li> <li>Direct access to the response code and headers sent by the server.</li> <li>The ability to set connection timeouts.</li> <li>HttpMethods implement the Command Pattern to allow for parallel requests and efficient re-use of connections.</li> <li>Source code is freely available under the Apache Software License.</li> </ul></li> </ul>
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    1. POWhat is the best Java library to use for HTTP POST, GET etc.?
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    1. USChris
    1. USChris
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    1. POWhat is the best Java library to use for HTTP POST, GET etc.?
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    1. CO+1 Great answer: Great example. Great points. You really sell Apache HTTP Client.
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    2. COThe documentation is OUT OF DATE though. HttpClient is not a concrete class anymore, it is an interface, therefore the above code WILL NOT WORK as it attempts to instantiate this HttpClient interface. Instead you'll have to instantiate a class that implements HttpClient interface, for example DefaultHttpClient.
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    3. COit feels like every release is too many major changes...getting really frustrated with this library over the years....and now they seem to leak connections from the pool which I have a max of 20 set up....grrrrrr.
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      1. USDean Hiller
 

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