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Android HttpResponseCache 不工作 - FileNotFoundException

转载 作者:可可西里 更新时间:2023-11-01 17:09:10 25 4
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我在 Android 中缓存来自 Web 服务器的 http(s) 响应时遇到问题,文档很差,所以我在这里寻求帮助。这是我的代码:

    String encodedString = String.format("jsonData=%s", URLEncoder.encode(json, "UTF-8"));

URL urlConn = new URL(url+"?"+encodedString);

HttpURLConnection cachedUrlConnection = (HttpURLConnection) urlConn.openConnection();
cachedUrlConnection.setUseCaches(true);
cachedUrlConnection.setDoInput(true);
cachedUrlConnection.setDoOutput(true);
cachedUrlConnection.setRequestProperty("charset", "utf-8");
cachedUrlConnection.setRequestMethod("GET");

cachedUrlConnection.addRequestProperty("Cache-Control", "only-if-cached");


InputStream is = null;
try {
is = cachedUrlConnection.getInputStream();

Log.i("_INFO","------CACHE FOUNDED");

} catch (FileNotFoundException e){
e.printStackTrace();

HttpURLConnection nonCachedUrlConnection = (HttpURLConnection) urlConn.openConnection();
nonCachedUrlConnection.setUseCaches(true);
nonCachedUrlConnection.setDoInput(true);
nonCachedUrlConnection.setDoOutput(true);
nonCachedUrlConnection.setRequestProperty("charset", "utf-8");
nonCachedUrlConnection.setRequestMethod("GET");
nonCachedUrlConnection.addRequestProperty("Cache-Control", "max-stale=" + (60 * 60 * 24));

Log.i("_INFO","-------CACHE NOT FOUNDED");

is = nonCachedUrlConnection.getInputStream();
}

此外,我已经在 Application onCreate 方法上安装了缓存,如下所示:

try {
long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
File httpCacheDir = new File(getExternalCacheDir(), "http");
Class.forName("android.net.http.HttpResponseCache")
.getMethod("install", File.class, long.class)
.invoke(null, httpCacheDir, httpCacheSize);

Log.i("_INFO", "HttpResponseCache enabled");

} catch (Exception httpResponseCacheNotAvailable) {
Log.d("_INFO", "HTTP response cache is unavailable.");
}

如果我打印缓存大小,在应用程序重新启动后,它会正确打印 2 mb 的缓存大小(因此它可以正确缓存)。我在所有 HTTP 调用后刷新缓存,如下所示:

HttpResponseCache cache = HttpResponseCache.getInstalled();
if(cache != null) {
Log.i("_INFO", "CACHED FLUSHED WITH " + cache.size());
cache.flush();
}

所以,基本上,缓存过程运行良好,但是当我获取 InputStream 时我无法获取缓存的响应。我的 logcat 总是打印“CACHE NOT FOUNDED”。

最佳答案

一段时间后,我找到了解决方案,似乎我的 HTTP 调用中的参数太多,或者可能是一个错误的参数。

只有:

cachedUrlConnection.addRequestProperty("Cache-Control", "max-stale=" + maxStale);

这一个,缓存工作很迷人。

关于Android HttpResponseCache 不工作 - FileNotFoundException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/26481434/

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