I got task unfortunately from work to create page using spring mvc, but i never work with that. I have to do that web app with restricted specifications which are following:
JSP cannot contain javascript, java, jstl only spring mvc tag's, but it's not everything. Controller must containt vaiable's only inside methods, all methods can return only String or void, so I'm unable to use #ModelAttribute, ModelMap, Model to move data from one view to another.
Is it possible to create page with following rules? I dont realy know how beans work in Spring MVC, but it seems that it will doesnt work without it.
Related
I am new to Spring and JSF,and I want to integrate JSF for the front end, and use Spring controller. Can Anyone give me a explanation or an example how this can be done?. Basically what I want is a form submission (which will create a Business object and feed it to the database) and navigate using controllers.
The required xml files ? and its element?
A Basic form( ex: Like a User registration )
Spring class with #Controller, and #RequestMapping etc.
I just want to know how the form submission works and the flow of that.
If you want to integrate Spring with JSF you don't need to use #Controller and #RequestMapping, those are for SpringMVC. JSF itself has navigation mechanism use that.
If you need example check Integrate Spring into JSF 2
I am coming from a ASP.Net MVC world where Microsoft provides the LinkExtensions.ActionLink method in Razor (their version of JSP) to generate anchor element (a element) to a specific controller/action.
The concept is pretty simple: the Razor (JSP) code references the controller and action, the ActionLink function does the hard work of generating the correct URI to get to that controller/action.
Is there anything like this in Spring MVC?
Unfortunately, Spring doesn't support this at the moment, although there is a feature request for it. The best you can do right know is use <spring:url> and hardcode the path to the controller and action. <spring:url> will give you a context-root-relative URL.
Part of the difficulty in implementing this is that Spring gives you the power to arbitrarily define your mappings (i.e. with #RequestMapping). So if you're not using ControllerClassNameHandlerMapping it can be an issue.
Spring 2.5.6SEC02
Spring Webflow 2.0.9
I have a normal flow in which I have a form in flow scope. I now want to call my annotated spring MVC #Controller and get access to the form information. I basically want to display details as a modal dialog box on the screen. I've been reading up on spring-js, but I'm not very familiar with it and it seems to want to incorporate dojo into my code.
Thanks in Advance.
You can keep the form in session scope instead, that way it is available both to webflow and other controllers. That will however mean that it is shared between tabs and possibly reused in later conversations (Though you can probably prevent that).
Another solution is passing the flow execution key to the controller and have the controller read it from the FlowExecutionRepository.
I am writing a Spring web application in Eclipse. In WEB-INF I have a web.xml file that gives a servlet mapping for a myapp-servlet.xml file.
In myapp-servlet.xml, I have a bean for a page controller. I surmise that the Spring DispatcherServlet instantiates these beans from its own ApplicationContext. When I run my project as a server, it displays the index.jsp file - "hello hello hello".
Now I also surmise that were I to put a submit button that sends post data in this index.jsp file, my page controller would be notified of the HTTP request. However, how can I interact with the rest of my application (the business layer) from the page controller? I am writing an LDAP Directory Lookup application, and once the user inputs a name I want to return an email. So, when the user inputs a name and hits submit, I want to communicate with my LDAP business layer. How can I do this?
One way I have thought of doing this is to add my business objects as properties to the page controller in the myapp-servlet.xml file. However, this seems to integrate the business layer and the controllers far too much for my liking - it means that every controller would need properties for business objects.
Another way I have thought of doing this is to create a kind of factory that all controllers have listed as a property in their XML. Through this factory, the controllers can access business objects; the factory is the interface between the two layers.
These are both custom ideas, and I suspect that there is a pre-made solution. Is there already a method of going about this? (Integrating business layer with web / page controller layer?) Or is it up to the programmer to concoct a custom solution as I outlined above?
Thanks, (and sorry for the long question - hence the bold)
ktm
Your controller needs to somehow hold a reference to your business objects. To fully benefit of Spring, you will want to inject those dependencies into your controller.
This is not tight coupling, especially if those business objects implement an interface and your controller will only know about that interface.
Dependency injection eliminates the need for factories as you will need to know about the service interfaces with our without a factory:
SomeBusinessServiceInterface service = businessFactory.getBusinessService();
But think about it like this: you must somehow get a reference of some service (using that service interface for low coupling) and most likely you need to cache that -- store it as an instance variable. Since you have that anyway, providing a setter does not couple your web and business tier any more than they already are.
If a setter seems unnatural (and it sometimes is) use constructor injection to implement this as classic OO aggregation.
Regarding the application context config, Spring allows you to define a webapp-wide application context defined using a ContextLoaderListener in web.xml. This is usually where all your business bean definitions should reside. Your -servlet.xml application context is bound to the servlet and should usually contain MVC stuff, referencing the beans in the root context as that context automatically becomes the parent of all the -servlet.xml (therefore all the beans there are visible for your servlets).
I'm developing a web application using Spring MVC 3.0 and looking for a ready-made solution, if any, or a "best practices" reference for a url/action mapping and routing system that can achieve the following:
REST-friendly controller / method name to view mapping. The current mapping implementation translates the request to a view name, which may be problematic when using several parameters and is incompatible with REST urls
A service that accepts the name of a controller, a method and arguments values and renders the URL that's represented by them
Integration with Spring Security that can allow me to check for a given URL whether the current user is allowed to access it, so that I can decide whether or not to render a URL
A menuing system based on the above that can define menues composed of these actions and render them to page
Basically what I need is the ability to define URLs in one centralized place, so that changing a URL (during development; I'm aware of the don't-change-live-urls idea :) ) does not mean looking up and changing that URL in a zillion pages.
Any directions to such an existing solution / tutorial / guide would be great.
Thanjs
This is a feature I really miss in Spring MVC.
That's why I created the springmcv-router project, basically a port of PlayFramework's Router implementation in Spring MVC (HandlerMapping + HandlerAdapter).
I'm heavily using it in several real-world projects and the Router implementation itself is reliable.
Try using Spring Roo. It utilizes many best practices for spring MVC, and it has a scaffolding feature that automatically maintains a menu, jsp's and all the CRUD methods of a controller.
Setting up Spring Security with Roo is as simple as typing "security setup".
Hope this is helpful.