spring Model、ModelMap 和 ModelAndView 之间有什么区别？
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What are the differences between Model, ModelMap, and ModelAndView?
提问by Basavaraj
What are the main differences between the following Spring Frameworkclasses?
以下Spring Framework类之间的主要区别是什么？
ModelModelMapModelAndView
ModelModelMapModelAndView
Using Model.put(String,Object)we can access the values in .jspfiles, but ModelMap.addAttribute(String,Object)also did same thing. I do not understand the difference between these classes.
使用Model.put(String,Object)我们可以访问.jsp文件中的值，但ModelMap.addAttribute(String,Object)也可以做同样的事情。我不明白这些课程之间的区别。
回答by Bart
Modelis an interface while ModelMapis a class.
Model是一个接口ModelMap而是一个类。
ModelAndViewis just a container for both a ModelMapand a view object. It allows a controller to return both as a single value.
ModelAndView只是一个容器ModelMap和一个视图对象。它允许控制器将两者作为单个值返回。
回答by Vikas Harle
Differences between Model, ModelMap, and ModelAndView
Model、ModelMap 和 ModelAndView 的区别
Model:It is an Interface. It defines a holder for model attributes and primarily designed for adding attributes to the model.
模型：它是一个接口。它定义了模型属性的持有者，主要用于向模型添加属性。
Example:
例子：
@RequestMapping(method = RequestMethod.GET)
public String printHello(Model model) {
model.addAttribute("message", "Hello World!!");
return "hello";
}
ModelMap:Implementation of Map for use when building model data for use with UI tools.Supports chained calls and generation of model attribute names.
ModelMap：Map 的实现，用于构建与 UI 工具一起使用的模型数据。支持链式调用和模型属性名称的生成。
Example:
例子：
@RequestMapping("/helloworld")
public String hello(ModelMap map) {
String helloWorldMessage = "Hello world!";
String welcomeMessage = "Welcome!";
map.addAttribute("helloMessage", helloWorldMessage);
map.addAttribute("welcomeMessage", welcomeMessage);
return "hello";
}
ModelAndView:This class merely holds both to make it possible for a controller to return both model and view in a single return value.
ModelAndView：这个类只是为了让控制器可以在一个返回值中同时返回模型和视图。
Example:
例子：
@RequestMapping("/welcome")
public ModelAndView helloWorld() {
String message = "Hello World!";
return new ModelAndView("welcome", "message", message);
}
回答by Ashu
Model: is an interface it contains four addAttribute and one merAttribute method.
Model：是一个接口，它包含四个 addAttribute 和一个 merAttribute 方法。
ModelMap: implements Map interface. It also contains Map method.
ModelMap: 实现 Map 接口。它还包含 Map 方法。
ModelAndView: As Bart explain it allows a controller return both as a single value.
ModelAndView：正如 Bart 解释的那样，它允许控制器将两者作为单个值返回。
