保留 cookie 的 Java 中的后续 HTTPS POST 请求

Question

我需要获取 HTTPS URL 的输入流，例如。 https://baseurl.com/mypdfgenerated.php?param=somevalue。为了访问这个 URL，我需要通过提供 BODY 参数来访问登录页面（例如https://baseurl.com/login.php）：

user_name, web_pwd and submit_login 

我假设成功访问第一个 URL 的唯一方法是通过 POST 到 /login.php，然后存储 cookie，然后在下一个 GET 请求中重用 cookie-session-ID；如果这是正确的方法，那么有人可以与正确/最近的库分享解决方案吗？

Answer 1

不确定哪个是最好的方法，但帮助我实现这一目标的是 CloseableHttpClient 类，它与 BasicCookieStore 一起为登录后的后续请求保留 cookie，实现如下：

BasicCookieStore cookieStore = new BasicCookieStore(); 
CloseableHttpClient httpclient = HttpClients.custom().setDefaultCookieStore(cookieStore).build(); 
HttpUriRequest login = RequestBuilder.post()
                    .setUri(new URI(url_login))
                    .addParameter("login", "loginuname")
                    .addParameter("password", "pwd")
                    .addParameter("submit", "sub_mit");
CloseableHttpResponse response = httpclient.execute(login);
List<Cookie> cookies = cookieStore.getCookies();
response.close();

HttpGet httpget2 = new HttpGet(url_to_get_after_login);
CloseableHttpResponse response2 = httpclient.execute(httpget2);
response2.close();

Answer 2

来自Java Samples的示例代码sn-p

try { 
    System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
    java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider()); 
    URL url = new URL("https://www.yourwebsite.com/"); // Some URL
    HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
    connection.setDoInput(true); 
    connection.setDoOutput(true);
    connection.setRequestMethod("POST"); 
    connection.setFollowRedirects(true); 
    String query = "UserID=" + URLEncoder.encode("username"); 
    query += "&"; 
    query += "password=" + URLEncoder.encode("password"); 
    query += "&"; 
    // open up the output stream of the connection 
    DataOutputStream output = new DataOutputStream( connection.getOutputStream() ); 
    // write out the data 
    output.writeBytes( query ); 
}catch(Exception err){
    err.printStackTrace();
}

看看Usage of cookies

Answer 3

您应该使用为您处理 cookie 的库，例如 Apache HTTPClient。