modelattribute

Why do we need jackson databind?

由 别来无恙 提交于 2021-02-10 11:57:59
问题 I am new in JAVA EE. My question is, why do we need jackson databind? Because We can receive the Request Params by @ModelAttribute and requests through http PUT or POST by @RequestBody . I can't find a reason why we need jackson databind to convert json/xml to POJO or vice versa. Thanks. 回答1: Why do we need jackson databind? Because representing structured data is much easier using XML (or JSON) than using simple name-value pairs. Because it is more convenient to send and receive JSON from

Why do we need jackson databind?

由 喜欢而已 提交于 2021-02-10 11:50:38
问题 I am new in JAVA EE. My question is, why do we need jackson databind? Because We can receive the Request Params by @ModelAttribute and requests through http PUT or POST by @RequestBody . I can't find a reason why we need jackson databind to convert json/xml to POJO or vice versa. Thanks. 回答1: Why do we need jackson databind? Because representing structured data is much easier using XML (or JSON) than using simple name-value pairs. Because it is more convenient to send and receive JSON from

Why do we need jackson databind?

由 六眼飞鱼酱① 提交于 2021-02-10 11:50:22
问题 I am new in JAVA EE. My question is, why do we need jackson databind? Because We can receive the Request Params by @ModelAttribute and requests through http PUT or POST by @RequestBody . I can't find a reason why we need jackson databind to convert json/xml to POJO or vice versa. Thanks. 回答1: Why do we need jackson databind? Because representing structured data is much easier using XML (or JSON) than using simple name-value pairs. Because it is more convenient to send and receive JSON from

When we must use @ModelAttribute, and how it works

由 陌路散爱 提交于 2020-06-12 11:44:08
问题 Hello I have question about @ModelAttribute annotation. As i understand, we use @ModelAttribute in method arguments to get data from the model. But it's quite hard to understand clearly when and how its used. (Code samples are from Spring in Action 5 book) Why in this case in the code below in public String processOrder() method we do not use @ModelAttribute annotation on @Valid Order order @Controller @RequestMapping("/orders") @SessionAttributes("order") public class OrderController {

When we must use @ModelAttribute, and how it works

由 安稳与你 提交于 2020-06-12 11:43:51
问题 Hello I have question about @ModelAttribute annotation. As i understand, we use @ModelAttribute in method arguments to get data from the model. But it's quite hard to understand clearly when and how its used. (Code samples are from Spring in Action 5 book) Why in this case in the code below in public String processOrder() method we do not use @ModelAttribute annotation on @Valid Order order @Controller @RequestMapping("/orders") @SessionAttributes("order") public class OrderController {

how to set @modelattribute boolean value inside html

由 限于喜欢 提交于 2020-01-25 10:31:46
问题 the code shows below the Users value from @Modelattribute is boolean an how to set this condition <div th:each="s: ${Users}"> <div th:if="${s == true" > <header th:include="../templates/SellerTemplate :: header" id="header"> </header> </div> <div th:if="${s != true}" > <header th:include="../templates/homeTemplate :: header" id="header"> </header> </div> </div> the @Modelattribue public boolean users ; @ModelAttribute("Users") public boolean getloggeduser() { if(securityDAO

ModelAttribute returns null values in controller in Spring MVC

由 给你一囗甜甜゛ 提交于 2020-01-14 12:37:09
问题 Ok, its time to seek help; I am sending a (shopping) Cart ModelAttribute to my jsp, allowing the user to edit the quantity, when the Model is POST to the controller the fields are null except the editable (quantity) field. I have researched for days on similar issues but nothing is matching. I am using spring 3.1. Here is my controller on the GET and POST: @Controller public class CartController { @Autowired private Cart cart; @RequestMapping(value = "/cart", method = RequestMethod.GET)

Spring MVC ModelAttribute学习

由 一世执手 提交于 2020-01-07 07:36:55
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> ModelAttribute 也是 SpringMVC 控制器类中的注解之一，主要有三个作用： 1. 注解在参数上。 绑定请求参数到命令对象，并把命令对象添加到Model，用于视图页面展示。 @RequestMapping("/save") public String save(@ ModelAttribute (“bwf”) Company bwf) { service.save(bwf); return "result"; } 它的作用是将该绑定对象以“bwf”为key，添加Model对象中，供视图页面展示使用。页面中可以使用${bwf.name}来获取绑定对象的属性。 2. 注解在普通方法上（非RequestMapping注解的方法）。 @ModelAttribute("bwf") public User addCompany(Company bwf) { return new Company("1","博为峰"); } 假设此方法是写在某个Controller内,那么执行该Controller内带有@RequestMapping注解的方法之前,都会先执行此addCompany方法，并且在model对象中将添加bwf对象。 3. 注解在@RequestMapping 方法返回值上。

Omit ModelAttribute from view

由 一世执手 提交于 2020-01-04 03:27:10
问题 I have a rest application that returns json/xml. I use jackson and jaxb for conversion. Some methods need to accept a query_string. I've used @ModelAttribute to map the query_string into an object, but this forces the object into my view. I do not want the object to appear in the view. I think I need to use something other than @ModelAttribute, but I can't figure out how to do the binding, but not modify the view. If I omit @ModelAttribute annotation, the object appears in the view as the

Array @ModelAttribute expansion in Spring MVC

由 风流意气都作罢 提交于 2020-01-02 19:57:58
问题 *Edit: I may have to use a list but the same principle applies. I'm attempting to bind an array to a form using the @ModelAttribute annotation. A table is populated with the contents of the array (each element in the array corresponds to a row in the table). The array may be populated with data or may be empty when it's bound. The user can add rows to the table (which should add elements to the array). My question is how can elements be added to the array if it's already defined before I pass
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