HttpComponents组件特性探究(4)

　　*/

　　public void setReadTimeout(int timeout) {

　　Validate.isTrue(timeout >= 0, "Timeout must be a non-negative value");

　　getHttpClient().getParams().setIntParameter(CoreConnectionPNames.SO_TIMEOUT, timeout);

　　}

　　/**

　　* Create a Commons HttpMethodBase object for the given HTTP method and URI

　　* specification.

　　*

　　* @param httpMethod the HTTP method

　　* @param uri the URI

　　* @return the Commons HttpMethodBase object

　　*/

　　protected HttpUriRequest createHttpUriRequest(HttpMethod httpMethod, URI uri) {

　　switch (httpMethod) {

　　case GET:

　　return new HttpGet(uri);

　　case DELETE:

　　return new HttpDelete(uri);

　　case HEAD:

　　return new HttpHead(uri);

　　case OPTIONS:

　　return new HttpOptions(uri);

　　case POST:

　　return new HttpPost(uri);

　　case PUT:

　　return new HttpPut(uri);

　　case TRACE:

　　return new HttpTrace(uri);

　　default:

　　throw new IllegalArgumentException("Invalid HTTP method: " + httpMethod);

　　}

　　}

　　/**

　　* Execute the given method on the provided URI.

　　*

　　* @param method the HTTP method to execute (GET, POST, etc.)

　　* @param url the fully-expanded URL to connect to

　　* @param responseHandler httpClient will automatically take care of

　　* ensuring release of the connection back to the connection

　　* manager regardless whether the request execution succeeds or

　　* causes an exception,if using this response handler

　　* @return an response object's string representation

　　* @throws IOException

　　* @throws ClientProtocolException

　　*/

　　public String doExecuteRequest(HttpMethod httpMethod, URI uri,

　　ResponseHandler responseHandler)

　　throws ClientProtocolException, IOException {

　　return httpClient.execute(createHttpUriRequest(httpMethod, uri), responseHandler);

　　}

　　public InputStream doExecuteRequest(HttpMethod httpMethod, URI uri)

　　throws ClientProtocolException, IOException {

　　//1.

　　HttpUriRequest httpUriRequest = createHttpUriRequest(httpMethod, uri);

　　//2.

　　HttpResponse response = httpClient.execute(httpUriRequest);

　　//3.

　　validateResponse(response);

　　//4.

　　return getResponseBody(response);

　　}

　　/**

　　* Validate the given response, throwing an exception if it does not

　　* correspond to a successful HTTP response.

　　*

　　* Default implementation rejects any HTTP status code beyond 2xx, to avoid

　　* parsing the response body and trying to deserialize from a corrupted

　　* stream.

　　*

　　* @param config the HTTP invoker configuration that specifies the target

　　* service

　　* @param response the resulting HttpResponse to validate

　　* @throws NoHttpResponseException

　　* @throws java.io.IOException if validation failed

　　*/

　　protected void validateResponse(HttpResponse response) throws IOException {

　　StatusLine status = response.getStatusLine();

　　if (status.getStatusCode() >= 300) {

　　throw new NoHttpResponseException(

　　"Did not receive successful HTTP response: status code = "

　　+ status.getStatusCode() + ", status message = ["

　　+ status.getReasonPhrase() + "]");

　　}

　　}

　　/**

　　* Extract the response body

　　*

　　* The default implementation simply fetches the response body stream. If

　　* the response is recognized as GZIP response, the InputStream will get

　　* wrapped in a GZIPInputStream.

　　*

　　* @param httpResponse the resulting HttpResponse to read the response body

　　* from

　　* @return an InputStream for the response body

　　* @throws java.io.IOException if thrown by I/O methods

　　* @see #isGzipResponse

　　* @see java.util.zip.GZIPInputStream

　　*/

　　protected InputStream getResponseBody(HttpResponse httpResponse) throws IOException {

　　if (isGzipResponse(httpResponse)) {

　　return new GZIPInputStream(httpResponse.getEntity().getContent());

　　} else {

　　return httpResponse.getEntity().getContent();

　　}

原文转自：http://www.ltesting.net