Pro Spring MVC: With Web Flow (Expert's Voice in Spring)

By Marten Deinum, Koen Serneels

Pro Spring MVC presents in-depth insurance of Spring MVC and Spring net circulate, hugely customizable and strong internet frameworks delivered to you by way of the builders and group of the Spring Framework.

Spring MVC is a contemporary internet program framework outfitted upon the Spring Framework, and Spring net stream is a undertaking that enhances Spring MVC for construction reusable internet controller modules that encapsulate wealthy web page navigation principles. besides targeted research of the code and performance, plus the 1st released insurance of Spring internet stream 2.x, this e-book comprises a number of counsel and tips to assist you get the main out of Spring MVC, Spring internet movement, and internet improvement in general.

Spring MVC and Spring net stream were upgraded within the new Spring Framework 3.1 and are engineered with very important issues for layout styles and specialist object-oriented programming suggestions. This e-book explains not just the layout judgements of the frameworks, but in addition how one can practice related designs and strategies on your personal code.

This publication takes nice care in overlaying each inch of Spring MVC and Spring net circulation to provide you the full photograph. besides all of the most sensible recognized beneficial properties of those frameworks, you’ll become aware of a few new hidden treasures. You’ll additionally methods to accurately and appropriately expand the frameworks to create personalized strategies. This book is for someone who needs to put in writing powerful, glossy, and valuable net purposes with the Spring Framework.

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Prospringmvc. bookshop. area. Account; import com. apress. prospringmvc. bookshop. provider. AccountService; import com. apress. prospringmvc. book place. provider. AuthenticationException; @Controller @RequestMapping(value = "/login") public classification LoginController { public static ultimate String ACCOUNT_ATTRIBUTE = "account"; @Autowired inner most AccountService accountService; 127 CHAPTER five  imposing CONTROLLERS @RequestMapping(method = RequestMethod. GET) public String login() { go back "login"; } } @RequestMapping(method = RequestMethod. put up) public String handleLogin(HttpServletRequest request, HttpSession consultation) throws AuthenticationException { try out { String username = request. getParameter("username"); String password = request. getParameter("password"); Account account = this. accountService. login(username, password); consultation. setAttribute(ACCOUNT_ATTRIBUTE, account); go back "redirect:/index. htm"; } seize (AuthenticationException ae) { request. setAttribute("exception", ae); go back "login"; } } prior to we movement on, let’s drill down on how the handleLogin strategy works. The username and password parameters are retrieved from the request, and those are used to name the login approach at the AccountService. If the right kind credentials are provided, we get an Account example for the consumer (which we shop within the session), after which we redirect to the index web page. If the credentials usually are not right, the provider throws an AuthenticationException, which, for now, is dealt with via the controller. The exception is kept as a request characteristic, and we go back the person to the login web page. even if the present controller does its paintings, we're nonetheless working without delay at the HttpServletRequest. this can be a relatively bulky (but occasionally important) process; although, we'd often are looking to keep away from this and use the versatile process signatures to make our controllers easier. With that during brain, let’s alter the controller and restrict our use of without delay getting access to the request (see directory 5-12). directory 5-12. The LoginController with RequestParam package deal com. apress. prospringmvc. bookstall. net. controller; import org. springframework. internet. bind. annotation. RequestParam; // different imports passed over, see directory 5-11 @Controller @RequestMapping(value = "/login") public type LoginController { // different tools passed over @RequestMapping(method = RequestMethod. submit) public String handleLogin(@RequestParam String username, @RequestParam String password, HttpServletRequest request, 128 CHAPTER five  enforcing CONTROLLERS } HttpSession consultation) throws AuthenticationException { attempt { Account account = this. accountService. login(username, password); consultation. setAttribute(ACCOUNT_ATTRIBUTE, account); go back "redirect:/index. htm"; } trap (AuthenticationException ae) { request. setAttribute("exception", ae); go back "login"; } } utilizing the RequestParam annotation simplified our controller. although, our exception dealing with dictates that we nonetheless desire entry to the request. this may switch within the subsequent bankruptcy once we enforce exception dealing with.

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