Question

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我正在尝试从已建立的连接中获取cookie。以下代码运行良好，但它在Android 2.2及更低版本上抛出了NullPointer异常：

URL url = new URL("https://myloginform");
            trustAllHosts(); //because the certificate is not singed
            HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
            conn.setHostnameVerifier(DO_NOT_VERIFY);
            conn.setInstanceFollowRedirects(false);
            conn.setDoOutput(true);

            //Connect to login-page and send login data
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(data);
            wr.flush();
            wr.close();     

            //get cookies THIS WORKS ONLY ON ANDROID 2.3 AND ABOVE
            List<String> cookies = conn.getHeaderFields().get("Set-Cookie");
            conn.disconnect();

            //connect to overview page
            url = new URL("https://mynextpage");
            trustAllHosts();
            conn = (HttpsURLConnection) url.openConnection();
            conn.setHostnameVerifier(DO_NOT_VERIFY);
            conn.setInstanceFollowRedirects(false);




            //Send cookies for identification - THIS WILL THROW A NULLPOINTER EXCEPTION
            for (String cookie : cookies) {
                conn.addRequestProperty("Cookie", cookie.split(";", 2)[0]);
            }





            // Get the response
            BufferedReader rd = new BufferedReader(new InputStreamReader(
                    conn.getInputStream()));

            while (!(line2.contains("</html>"))) {
                line = rd.readLine();
                line2 += line;
            }
            // wr.close();
            rd.close();

有谁知道为什么？

找到解决方案。 Android 2.2中没有“Set-Cookie”，它是“set-cookie”

Answer 1

这不是Android的东西，它是一个HTTP的东西。 Cookie的HTTP标头为Set-Cookie。也许Android 2.3+的行为很奇怪，但在HTTP请求/响应中不应该修改标头。你应该把它归档为bug。

在Android 2.2上使用Cookie的NullPointer异常 - 在2.3及更高版本上正常工作

1 个答案: