小程序和 servlet 会话管理

Question

当我们与servlet通信时，我们如何确保会话信息被保留？

也就是说，我们如何在小程序servlet连接中管理cookie？

Answer 1

您可以使用像

org.apache.httpcomponents:httpclient https://hc.apache.org 这样的API，并使用HttpClient的CookieStore为请求设置cookie并从响应中读取它们。之后，您必须将 Cookie 存储在小程序中的某个位置（请参阅getSessionCookie()和setSessionCookie()方法存根）：

import org.apache.http.cookie.Cookie;
import org.apache.http.impl.client.*;
import org.apache.http.client.methods.HttpGet;
public class Connector {
  private Cookie getSessionCookie() { /* TODO get cookie from some store (local session, DB, whatever) */ } 
  private void setSessionCookie(Cookie sessionCookie) { /* TODO set cookie to some store (local session, DB, whatever) */ } 

  private void connect() {
    DefaultHttpClient client = new DefaultHttpClient();
    Cookie sessionCookie = getSessionCookie();
    if (sessionCookie != null) {
      client.getCookieStore().addCookie(jsessionidCookie);
    }
    client.setRedirectStrategy(new DefaultRedirectStrategy());
    // create a GET request to your Servlet in get()
    HttpGet get = new HttpGet("http://example.com/your/servlet");
    HttpResponse response = client.execute(method);
    int statusCode = response.getStatusLine().getStatusCode();
    if (statusCode == 200) {
      sessionCookie = getJsessionidCookie(client.getCookieStore().getCookies());
      // update session cookie
      setSessionCookie(sessionCookie);
    }
  }
  private Cookie getJsessionidCookie(List<Cookie> cookies) {
    for (Cookie cookie : cookies) {
      if (cookie.getName().equals("JSESSIONID")) {
        return cookie;
      }
    }
    return null;
  }
}