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Apress Pro Apache Struts with Ajax phần 8

để xác định phần tĩnh của một tập tin cấu hình trong những gì được gọi là một điểm hợp nhất. Là một nhiệm vụ Ant XDoclet phân tích tập tin nguồn của một ứng dụng, nó sẽ cố gắng để xác định vị trí bất kỳ tập tin hợp nhất-điểm (các tập tin kết hợp thực tế khác nhau cho mỗi tác vụ Ant XDoclet) | CHAPTER 9 LOGGING AND DEBUGGING 349 Setting the query criteria. memberVO.setUserld userld memberVO.setPassword password MemberDAO memberDAO new MemberDAO try memberVO MemberVO memberDAO.findByCriteria memberVO if memberVO null if log.isInfoEnabled log.info Failed Login Attempt. Username userId Password password else If log.isInfoEnabled log.info Successful Login Attempt for user userId catch DataAccessException e log.error Error in MemberManagerBD.authenticate e throw new ApplicationException Error in MemberManagerBD.validateUserId e.toString e log.debug authenticate finished return memberVO Notice that for failed attempts you write both the user name and the password to the log file whereas on successful attempts you write just the user name. The last thing you want to do is compromise the security of the JavaEdge application by storing valid user name and password combinations in a plain text file. Logging in the Web Tier Now to the section you ve been waiting for Logging in Struts Actions or ActionForms You can of course add any kind of logging you want to your Struts actions or ActionForms but since most if not all of the logic in your application will reside in the business tier there isn t really that much to log. Couple this with the extensive log output available from Struts and you shouldn t need to perform any logging inside of your actions or ActionForms. 350 CHAPTER 9 LOGGING AND DEBUGGING Logging ApplicationExceptions The ApplicationException class derives indirectly from RuntimeException making it an unchecked exception that is there is no need to either catch the exception within a method or declare it as thrown by that method. The JavaEdge application relies on Struts ability to handle exceptions globally using a global exception handler. For the JavaEdge application you build a global exception handler that sends the error details to an e-mail recipient. This is useful since it means that you can alert an administrator if something goes wrong in .