同一个容器下，不同的项目间的SESSION是不能共享的
protected Session doGetSession(boolean create) { // There cannot be a session if no context has been assigned yet if (context == null) return (null); // Return the current session if it exists and is valid if ((session != null) && !session.isValid()) session = null; if (session != null) return (session); // Return the requested session if it exists and is valid Manager manager = null; if (context != null) manager = context.getManager(); if (manager == null) return (null); // Sessions are not supported if (requestedSessionId != null) { try { session = manager.findSession(requestedSessionId); } catch (IOException e) { session = null; } if ((session != null) && !session.isValid()) session = null; if (session != null) { session.access(); return (session); } } // Create a new session if requested and the response is not committed if (!create) return (null); if ((context != null) && (response != null) && context.getCookies() && response.getResponse().isCommitted()) { throw new IllegalStateException (sm.getString("coyoteRequest.sessionCreateCommitted")); } // Attempt to reuse session id if one was submitted in a cookie // Do not reuse the session id if it is from a URL, to prevent possible // phishing attacks if (connector.getEmptySessionPath() && isRequestedSessionIdFromCookie()) { session = manager.createSession(getRequestedSessionId()); } else { session = manager.createSession(null); } // Creating a new session cookie based on that session if ((session != null) && (getContext() != null) && getContext().getCookies()) { Cookie cookie = new Cookie(Globals.SESSION_COOKIE_NAME, session.getIdInternal()); configureSessionCookie(cookie); response.addCookieInternal(cookie, context.getUseHttpOnly()); } if (session != null) { session.access(); return (session); } else { return (null); }}
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