Question

public class CacheDemo {

public static void main(String[] args) {
    CacheConfig cacheConfig = new CacheConfig();
    cacheConfig.setMaxCacheEntries(1000);
    cacheConfig.setMaxObjectSizeBytes(1024 * 1024);

    HttpClient cachingClient = new CachingHttpClient(new DefaultHttpClient(), cacheConfig);

    HttpContext localContext = new BasicHttpContext();

    sendRequest(cachingClient, localContext);
    CacheResponseStatus responseStatus = (CacheResponseStatus) localContext.getAttribute(
            CachingHttpClient.CACHE_RESPONSE_STATUS);
    checkResponse(responseStatus);


    sendRequest(cachingClient, localContext);
    responseStatus = (CacheResponseStatus) localContext.getAttribute(
            CachingHttpClient.CACHE_RESPONSE_STATUS);
    checkResponse(responseStatus);
}

static void sendRequest(HttpClient cachingClient, HttpContext localContext) {
    HttpGet httpget = new HttpGet("http://www.mydomain.com/content/");
    HttpResponse response = null;
    try {
        response = cachingClient.execute(httpget, localContext);
    } catch (ClientProtocolException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }
    HttpEntity entity = response.getEntity();
    try {
        EntityUtils.consume(entity);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

static void checkResponse(CacheResponseStatus responseStatus) {
    switch (responseStatus) {
        case CACHE_HIT:
            System.out.println("A response was generated from the cache with no requests "
                    + "sent upstream");
            break;
        case CACHE_MODULE_RESPONSE:
            System.out.println("The response was generated directly by the caching module");
            break;
        case CACHE_MISS:
            System.out.println("The response came from an upstream server");
            break;
        case VALIDATED:
            System.out.println("The response was generated from the cache after validating "
                    + "the entry with the origin server");
            break;
    }
}

}

这对我不起作用。

每次从服务器获取数据时都不从缓存中获取。

我使用jar "httpclient-cache-4.1-beta1"。

Answer 1

您尚未向我们展示您的HTTP服务器发生了什么。 mydomain.com/content上的服务是否在HTTP响应上设置了正确的Cache-Control标头？要使缓存起作用，您需要让HTTP服务器或Web应用程序指示是否可以缓存数据以及使用适当的标头缓存数据的长度。

另外，请检查CachingHttpClient上记录的API，以查看Web服务器所需的标头。

无法使用android中的cachingHttpClient缓存HttpResponse

1 个答案: