Java DefaultHttpClient.setHttpRequestRetryHandler方法代碼示例

import org.apache.http.impl.client.DefaultHttpClient; //導入方法依賴的package包/類
/**
 * Create a thread-safe client. This client does not do redirecting, to allow us to capture
 * correct "error" codes.
 *
 * @return HttpClient
 */
public final DefaultHttpClient createHttpClient() {
    HttpParams params = new BasicHttpParams();
    HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);  
    HttpProtocolParams.setContentCharset(params, HTTP.UTF_8);  
    HttpProtocolParams.setUseExpectContinue(params, true);  
    // Turn off stale checking. Our connections break all the time anyway,
    // and it's not worth it to pay the penalty of checking every time.
    HttpConnectionParams.setStaleCheckingEnabled(params, false);

    // Default connection and socket timeout of 30 seconds. Tweak to taste.
    HttpConnectionParams.setConnectionTimeout(params, 10*1000);
    HttpConnectionParams.setSoTimeout(params, 20*1000);
    HttpConnectionParams.setSocketBufferSize(params, 8192);
    
    ConnManagerParams.setTimeout(params, 5 * 1000);
    ConnManagerParams.setMaxConnectionsPerRoute(params, new ConnPerRouteBean(50));
    ConnManagerParams.setMaxTotalConnections(params, 200);
    
    // Sets up the http part of the service.
    final SchemeRegistry supportedSchemes = new SchemeRegistry();

    // Register the "http" protocol scheme, it is required
    // by the default operator to look up socket factories.
    final SocketFactory sf = PlainSocketFactory.getSocketFactory();
    supportedSchemes.register(new Scheme("http", sf, 80));
    supportedSchemes.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));  
    final ThreadSafeClientConnManager ccm = new ThreadSafeClientConnManager(params,
            supportedSchemes);
    
    DefaultHttpClient httpClient = new DefaultHttpClient(ccm, params);
    
    httpClient.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(3, true));
    
    return httpClient;
}
 

import org.apache.http.impl.client.DefaultHttpClient; //導入方法依賴的package包/類
public HttpClient getHttpClient()
{
    DefaultHttpClient client = new DefaultHttpClient(cm);
    Integer socketTimeout = 10000;
    Integer connectionTimeout = 10000;
    final int retryTime = 3;
    client.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, socketTimeout);
    client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, connectionTimeout);
    client.getParams().setParameter(CoreConnectionPNames.TCP_NODELAY, false);
    client.getParams().setParameter(CoreConnectionPNames.SOCKET_BUFFER_SIZE, 1024 * 1024);
    HttpRequestRetryHandler myRetryHandler = new HttpRequestRetryHandler()
    {
        @Override
        public boolean retryRequest(IOException exception, int executionCount, HttpContext context)
        {
            if (executionCount >= retryTime)
            {
                // Do not retry if over max retry count
                return false;
            }
            if (exception instanceof InterruptedIOException)
            {
                // Timeout
                return false;
            }
            if (exception instanceof UnknownHostException)
            {
                // Unknown host
                return false;
            }
            if (exception instanceof ConnectException)
            {
                // Connection refused
                return false;
            }
            if (exception instanceof SSLException)
            {
                // SSL handshake exception
                return false;
            }
            HttpRequest request = (HttpRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST);
            boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
            if (idempotent)
            {
                // Retry if the request is considered idempotent
                return true;
            }
            return false;
        }

    };
    client.setHttpRequestRetryHandler(myRetryHandler);
    return client;
}