java - HttpsURLConnection 第二次请求失败

Question

我正在使用 HttpsURLConnection 连接客户端应用程序。我正在为 1 个用户请求发送多个请求(例如登录、dosearch 和 getResult)。

对于第一个用户的请求(服务器第一个请求)，它工作正常。但是当第二个请求代码失败并因此面临多个重定向时。

当我为 1 个请求启动本地服务器时，它工作正常，其余的则失败，我已尝试通过以下设置:

con.setRequestProperty("Connection", "close");
System.setProperty("https.proxyPort", "8888");
System.setProperty("http.keepAlive", "false");

我能够建立连接，但第一次运行相同代码的代码随后失败。

示例代码:

URL url2 = new URL("client url");
    HttpsURLConnection con2 = (HttpsURLConnection) url2.openConnection();
    con2.setSSLSocketFactory(sc.getSocketFactory());

    CookieHandler.setDefault(new CookieManager());
    con2.setUseCaches(false);
    con2.setDefaultUseCaches(false);
    con2.setDoOutput(true);
    con2.setDoInput(true);
    con2.setReadTimeout(5000);
    con2.setRequestMethod("POST");
    con2.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0");
    con2.setRequestProperty("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    con2.setRequestProperty("Accept-Language","en-US,en;q=0.5");
    con2.setRequestProperty("Cache-Control","max-age=0");
    con2.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
    con2.setReadTimeout(6000);
    con2.setConnectTimeout(10000);
    con2.setRequestProperty("Connection", "close");

    List<NameValuePair> nameValuePairsLogin = new ArrayList<NameValuePair>();

    nameValuePairsLogin.add(new BasicNameValuePair("username", "username"));
    nameValuePairsLogin.add(new BasicNameValuePair("password", "password"));
    // some other inputs

    String params=Utils.getQuery(nameValuePairsLogin).toString();
    byte[] postDataBytes = params.toString().getBytes("UTF-8");
    con2.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length));
    con2.setInstanceFollowRedirects(false);

    DataOutputStream wr = new DataOutputStream(con2.getOutputStream());
    wr.write(postDataBytes);
    wr.flush();
    wr.close();

    boolean redirect = false;
    int status = con2.getResponseCode();

    if (status != HttpsURLConnection.HTTP_OK) {
        if (status == HttpsURLConnection.HTTP_MOVED_TEMP
                || status == HttpsURLConnection.HTTP_MOVED_PERM
                    || status == HttpsURLConnection.HTTP_SEE_OTHER)
            redirect = true;
    }

    System.out.println("Response Code ... " + status);
    if (redirect) {
        String newUrl = con2.getHeaderField("Location");
        String cookies = con2.getHeaderField("Set-Cookie");

        // open the new connnection again
        con2 = (HttpsURLConnection) new URL(newUrl).openConnection();
        con2.setSSLSocketFactory(sc.getSocketFactory());
        con2.setRequestProperty("Cookie", cookies);
        con2.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0");
        con2.setRequestProperty("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        con2.setRequestProperty("Accept-Language","en-US,en;q=0.5");
        //con2.setRequestProperty("Connection","keep-alive");
        con2.setRequestProperty("Cache-Control","max-age=0");
        con2.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
        con2.addRequestProperty("Referer", "Client URL");
        con2.setReadTimeout(6000);
        con2.setConnectTimeout(10000);
        con2.setRequestProperty("Connection", "close");
        con2.setUseCaches(false);
        con2.setDoOutput(true);
        con2.setDoInput(true);
        con2.setDefaultUseCaches(false);

        System.out.println("Redirect to URL : " + newUrl);
        DataOutputStream wr1 = new DataOutputStream(con2.getOutputStream());
        wr1.write(postDataBytes);
        wr1.flush();
        wr1.close();
    }



    String resonse2=Utils.toString(con2.getInputStream());

Utils.toString:

public static String toString(InputStream inputStream) throws IOException {


    String inputLine;
    BufferedReader in = new BufferedReader(new InputStreamReader(inputStream));
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();
    in=null;
    return response.toString();
}

像这样发出多个请求并为每个请求创建不同的 HttpsURLConnection。

感谢您提前提供的帮助。

Answer 1

每个HttpURLConnection实例用于发出单个请求。如果您想发送多个请求，请创建一个方法 getHttpURLConnection() ，该方法每次都会提供新的连接。