spring-mvc

问题 I need to prevent duplicate form submissions for my customer's website. we need some form data from user for order confirm page. we use load balancing for web server. Approach 1 : Post/Redirect/Get (PRG pattern : http://en.wikipedia.org/wiki/Post/Redirect/Get) I was trying to use PRG pattern at first. in this case, I think I need to deal with session(or spring flashmap) across multiple web server. Approach 2 : Disable refresh on client. one of my colleague suggested this approach. Approach 3

问题 I work with a front-end developer who writes JSP files. We have a form that is working correctly, except validation/binding/processing errors can't seem to be displayed with Spring's <form:errors/> tag. I've confirmed that the error is being set, and what is apparently the correct path for the errors. Supposedly <form:errors path="*" /> should render them all, regardless of path, but it shows nothing. Do I need to get into the tag library source to deduce what's going wrong? 回答1: 2 things I

问题 I am attempting to use synchronize method in spring controller. Because our Payment gateway hits method [@RequestMapping(value="/pay",method=RequestMethod.POST)] different transactions [txn id : txn01 & txn02] at a time. But these 2 different transaction processing one by one than parallel due to using synchronize block. Problem -> Why i am using synchronize block in controller is that say Transaction [txn01] hits [@RequestMapping(value="/pay",method=RequestMethod.POST)] twice like duplicate

问题 In all the MVC projects I've seen, "service" and "DAO" classes always implemented their own interfaces. But almost all the times, I haven't seen a situation in which having this interface has been useful. Is there any reason to use interfaces in these cases? What may be the consequence of not using interfaces in "service" and "DAO" classes? I can't imagine any consequences. 回答1: Spring is an Inversion of Control container. This, in one sense, means that the implementation of classes you use

问题 In all the MVC projects I've seen, "service" and "DAO" classes always implemented their own interfaces. But almost all the times, I haven't seen a situation in which having this interface has been useful. Is there any reason to use interfaces in these cases? What may be the consequence of not using interfaces in "service" and "DAO" classes? I can't imagine any consequences. 回答1: Spring is an Inversion of Control container. This, in one sense, means that the implementation of classes you use

问题 I want to allow cross origin requests for one domain. My project uses Spring so I want to take advantage of the new CORS support. I am using version 4.2.0 for all springframework dependencies. I followed the example here https://spring.io/blog/2015/06/08/cors-support-in-spring-framework#disqus_thread and tried the first version. My controller annotations looks like: @CrossOrigin(origins = "http://fiddle.jshell.net/", maxAge = 3600) @Controller @RequestMapping("/rest") public class

问题 I want to allow cross origin requests for one domain. My project uses Spring so I want to take advantage of the new CORS support. I am using version 4.2.0 for all springframework dependencies. I followed the example here https://spring.io/blog/2015/06/08/cors-support-in-spring-framework#disqus_thread and tried the first version. My controller annotations looks like: @CrossOrigin(origins = "http://fiddle.jshell.net/", maxAge = 3600) @Controller @RequestMapping("/rest") public class

问题 I'm trying to build the front-end part of a project with Angular and a basic REST backend that also handles security. I have very basic knowledge of Spring but haven't really worked with Spring Security. I'm trying to find a way to build a simple REST backend that is secured. I have searched online a lot and the main thing i found was this tutorial: https://spring.io/guides/tutorials/spring-security-and-angular-js/ . After reading it I still don't understand how I should get started. Also,

问题 Below is the mapped method that I am having trouble with, no matter what value I pass to it the validation returns "passed validation." @RequestMapping(value = "test", method = RequestMethod.POST) @ResponseBody public String getTest(@RequestBody @Valid @Max(32) long longValue, BindingResult result) { if (result.hasErrors()) { return "failed validation"; } else { return "passed validation"; } } I know the @Max works with my application because I use it for validation on custom objects that

问题 How can I register an ObjectIdResolver to an Spring/Jackson object mapper so that the ObjectIdResolver class gets instantiated by Spring? I would like to use dependency injection in my ObjectIdResolver class. ObjectIdResolver.java @Component public class UserIdResolver implements ObjectIdResolver { @Autowired UserConverter userConverter; @Override public void bindItem(ObjectIdGenerator.IdKey id, Object ob) { } @Override public Object resolveId(ObjectIdGenerator.IdKey id) { return