java - Internet 请求第一次有效，但后续请求无效

Question

在第一次请求时，它会进入互联网并检索数据。当我再次尝试时，它只会给我输入流中已经存在的数据。如何清除缓存的数据，以便每次都执行新请求？

这是我的代码：

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

Answer 1

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());

有关更多详细信息，请参阅Android URLConnection 文档。

Answer 2

HttpClient API 可能有用

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();

您需要捕获一些异常

Answer 3

每次重新创建 URL 对象。