Question

在第一次请求时，它会上网并检索数据。当我再次尝试时，它只是给我输入流中已有的数据。如何清除缓存的数据，以便每次都执行新的请求？

这是我的代码：

InputStreamReader in = null;
in = new InputStreamReader(url.openStream());
response = readFully(in);
url.openStream().close();

Answer 1

每次都重新创建URL对象。

Answer 2

您可以创建URLConnection并显式设置缓存策略：

final URLConnection conn = (URLConnection)url.openConnection();
conn.setUseCaches(false); // Don't use a cached copy.
InputStream in = new BufferedInputStream(urlConnection.getInputStream());

有关详细信息，请参阅The Android URLConnection documentation。

Answer 3

HttpClient API可能很有用

address = "http://google.com"
String html = "";
HttpClient httpClient = DefaultHttpClient();
HttpGet httpget = new HttpGet(address);
BufferedReader in = null;
HttpResponse response = null;
response = httpClient.execute(httpget);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String l = "";
String nl = System.getProperty("line.seperator");
while ((l = in.readLine()) != null) {
    sb.append(l + nl);
}
in.close();
html = sb.toString();

你需要抓住一些例外

Internet请求第一次运行，但不会在后续请求中运行

3 个答案: