modelattribute | 易学教程

Spring MVC - difference between HttpSession.setAttribute and model.addObject

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I am trying to learn Spring MVC recently. It seems that i did not understand well the functionalities of @ModelAttribute annotation and HttpSession. @SessionAttributes({"shoppingCart", "count"}) public class ItemController { @ModelAttribute("shoppingCart") public List<Item> createShoppingCart() { return new ArrayList<Item>(); } @ModelAttribute("count") public Integer createCount() { return 0; } @RequestMapping(value="/addToCart/{itemId}", method=RequestMethod.GET) public ModelAndView addToCart(@PathVariable("itemId") Item item, @ModelAttribute("shoppingCart") List<Item> shoppingCart,

Dynamic form and data binding with Spring MVC

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In my Spring MVC application I need to implement a dynamic questionnaire form: I have N questions and for each I have 3 options. So in my page I'll have something like this: | Question 1 | 1 | 2 | 3 | | Question 2 | 1 | 2 | 3 | | Question 3 | 1 | 2 | 3 | | ... | 1 | 2 | 3 | | Question N | 1 | 2 | 3 | Questions are stored in a database and for the options I'll use radio buttons. I'll use a forEach tag to creare dynamic rows, but I don't know how to post data and handle ModelAttribute binding in this scenario... Which could be a good structure for my model attribute class? Is it possible to use

Spring MVC @ModelAttribute method

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Question about Spring MVC @ModelAttribute methods, Setting model attributes in a controller @RequestMapping method verses setting attribute individually with @ModelAttribute methods, which one is considered better and is more used? From design point of view which approach is considered better from the following: Approach 1 @ModelAttribute("message") public String addMessage(@PathVariable("userName") String userName, ModelMap model) { LOGGER.info("addMessage - " + userName); return "Spring 3 MVC Hello World - " + userName; } @RequestMapping(value="/welcome/{userName}", method = RequestMethod

Difference between modelAttribute and commandName attributes in form tag in spring?

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In Spring 3, I have seen two different attribute in form tag in jsp <form:form method="post" modelAttribute="login"> in this the attribute modelAttribute is the name of the form object whose properties are used to populate the form. And I used it in posting a form and in controller I have used @ModelAttribute to capture value, calling validator, applying business logic. Everything is fine here. Now <form:form method="post" commandName="login"> What is expected by this attribute, is it also a form object whose properties we are going to populate? If you look at the source code of FormTag (4.3.x

Difference between modelAttribute and commandName attributes in form tag in spring?

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问题 In Spring 3, I have seen two different attribute in form tag in jsp <form:form method="post" modelAttribute="login"> in this the attribute modelAttribute is the name of the form object whose properties are used to populate the form. And I used it in posting a form and in controller I have used @ModelAttribute to capture value, calling validator, applying business logic. Everything is fine here. Now <form:form method="post" commandName="login"> What is expected by this attribute, is it also a

Spring MVC Multiple ModelAttribute On the Same Form

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I have a form with two ModelAttributes one is citizens and the other is punishment. The two objects are separated by jquery tabs. I am having problems in getting the items on the form to display properly some are being displayed and some are not. I mean the html elements. I am not sure how the Controller would look when there is multiple ModleAttributes on the page. Under is a sample of the code: Page <title>Citizen Registration</title> </head> <body> <div id="tabs"> <ul> <li><a href="#tab1">Citizen Registration</a></li> <li><a href="#tab2">Punishment</a></li> </ul> <div id="tab1"> <form:form

Spring MVC @ModelAttribute method

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问题 Question about Spring MVC @ModelAttribute methods, Setting model attributes in a controller @RequestMapping method verses setting attribute individually with @ModelAttribute methods, which one is considered better and is more used? From design point of view which approach is considered better from the following: Approach 1 @ModelAttribute("message") public String addMessage(@PathVariable("userName") String userName, ModelMap model) { LOGGER.info("addMessage - " + userName); return "Spring 3

Spring MVC Multiple ModelAttribute On the Same Form

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问题 I have a form with two ModelAttributes one is citizens and the other is punishment. The two objects are separated by jquery tabs. I am having problems in getting the items on the form to display properly some are being displayed and some are not. I mean the html elements. I am not sure how the Controller would look when there is multiple ModleAttributes on the page. Under is a sample of the code: Page <title>Citizen Registration</title> </head> <body> <div id=\"tabs\"> <ul> <li><a href=\"

How to pass model attributes from one Spring MVC controller to another controller?

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问题 I am redirecting from a controller to another controller. But I also need to pass model attributes to the second controller. I don\'t want to put the model in session. Please help. 回答1: I think that the most elegant way to do it is to implement custom Flash Scope in Spring MVC. the main idea for the flash scope is to store data from one controller till next redirect in second controller Please refer to my answer on the custom scope question: Spring MVC custom scope bean The only thing that is

What is @ModelAttribute in Spring MVC?

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问题 What is the purpose and usage of @ModelAttribute in Spring MVC? 回答1: @ModelAttribute refers to a property of the Model object (the M in MVC ;) so let's say we have a form with a form backing object that is called "Person" Then you can have Spring MVC supply this object to a Controller method by using the @ModelAttribute annotation: public String processForm(@ModelAttribute("person") Person person){ person.getStuff(); } On the other hand the annotation is used to define objects which should be