Reading the Username & Password
Spring Security 提供以下内置机制以从 HttpServletRequest 读取用户名和密码：
Spring Security provides the following built-in mechanisms for reading a username and password from HttpServletRequest:
Spring Security 提供以下内置机制以从 HttpServletRequest 读取用户名和密码：
Spring Security provides the following built-in mechanisms for reading a username and password from HttpServletRequest: