工作流程
前边我们提到所有请求都提交给ActionServlet来处理
("request".equals(mapping.getScope
))request.removeAttribute(mapping.getAttribute
);
session.removeAttribute(mapping.getAttribute
);}
// Forward control to the spec
ied success URI
(mapping.findForward("success"));}
/**
* Look up the user, throwing an exception to simulate business logic
* rule exceptions.
*
* @param database Database in which to look up the user
* @param username Username spec
ied on the logon form*
* @exception ModuleException
a business logic rule is violated*/
public User getUser(UserDatabase database, String username)
throws ModuleException {
// Force an ArithmeticException which can be handled explicitly
("arithmetic".equals(username)) {throw
ArithmeticException;}
// Force an application-spec
ic exception which can be handled ("expired".equals(username)) {throw
ExpiredPasswordException(username);}
// Look up and
the specied user ((User) database.findUser(username));}
}
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