httpclient的池化

541732025發表於2014-07-20
HTTPclient

我們經常在應用系統中使用httpclient來傳送http請求，我們通常會new httpclient建立物件，這樣，當請求併發量很大的時候，頻繁的建立、銷燬httpclient會導致不必要的效能開銷，所以有必要對httpclient這個重量級物件進行池化。
在此，我們使用apache提供的common-pool包做相應的事情。
重要程式碼如下：

點選(此處)摺疊或開啟

  1. public class HttpClientPool extends GenericObjectPool<HttpClient>{
  2.      //構造方法接受一個PoolableObjectFactory，來定義物件的建立
  3.     public HttpClientPool(PoolableObjectFactory<HttpClient> factory) {
  4.         super(factory);
  5.     }

  7.     //自定義
  8.     public <T> T doPost(HttpMethod method, HttpClientDataCallback<T> callback) {
  9.         HttpClient toUse = null;
  10.         try {
  11.             toUse = borrowObject();
  12.             toUse.executeMethod(method);
  13.             T rel = callback.handleResponse(method.getResponseBodyAsString());
  14.             return rel;
  15.         } catch (Exception e) {
  16.             logger.error(\"failed to execute http request.\", e);
  17.             return null;
  18.         } finally {
  19.             try {
  20.                 method.releaseConnection();
  21.             } catch (Exception e) {
  22.                 //in case fail, ignore and return object
  23.             }
  24.             if (toUse != null) {
  25.                 try {
  26.                     returnObject(toUse);
  27.                 } catch (Exception e) {
  28.                     logger.warn(\"failed to return http client\", e);
  29.                 }
  30.             }
  31.         }
  32.     }
  33. }


PoolableHttpClientFactory：該類實現對池化物件的初始建立動作

點選(此處)摺疊或開啟

  1. public class PoolableHttpClientFactory implements PoolableObjectFactory<HttpClient> {
  2.     private int contimeout; //Connection time out
  3.     private int sotimeout; //so time out

  5.     public PoolableHttpClientFactory(int contimeout, int sotimeout) {
  6.         this.contimeout = contimeout;
  7.         this.sotimeout = sotimeout;
  8.     }

  10.     /*物件的生成在此定義
  11.      *(non-Javadoc)
  12.      * @see org.apache.commons.pool.PoolableObjectFactory#makeObject()
  13.      */
  14.     @Override
  15.     public HttpClient makeObject() throws Exception {
  16.         HttpClient httpClient = new HttpClient();
  17.         HttpConnectionManagerParams configParams = httpClient.getHttpConnectionManager().getParams();
  18.         configParams.setConnectionTimeout(contimeout);
  19.         configParams.setSoTimeout(sotimeout);
  20.         httpClient.getParams().setConnectionManagerTimeout(contimeout);
  21.         httpClient.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, \"UTF-8\");
  22.         return httpClient;
  23.     }
  24. }



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