基础连接为有状态时如何使用Apache HttpClient？

Question

I have googled a lot about how to use HttpClient with multithreading. Most of them suggest using the ThreadSafeClientConnManager. But my application has to login some host(a login form page) so that HttpClient obtains a underlying stateful connection. Can ThreadSafeClientConnManager hold the login state if multithreading?

Answer 1

Read the following sections from this page: HttpClient Tutorial about Cookies and state management 3.8. HTTP state management and execution context 3.9. Per user / thread state management

and this maybe that code you want:

HttpClient httpclient = new DefaultHttpClient();
// Create a local instance of cookie store
CookieStore cookieStore = new BasicCookieStore();
// Create local HTTP context
HttpContext localContext = new BasicHttpContext();
// Bind custom cookie store to the local context
localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);
HttpGet httpget = new HttpGet("http://www.google.com/"); 
// Pass local context as a parameter
HttpResponse response = httpclient.execute(httpget, localContext);

Answer 2

Yes, HttpClient will maintain state (Eg session cookies) with thread safe connection manager.

If you face any issues with login, try switching to "Browser compatibility" cookie policy.

client.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);