如何将@RequestParam绑定到spring MVC中的object？ [英] How to bind @RequestParam to object in spring MVC?

问题描述

我想通过AJAX发出POST请求，我还想将整个类对象绑定到请求，我想用 @requestParam 接收该请求注解。我知道可以用 @requestBody 注释完成，但我很想知道：我们可以用 @requestParam 注释？

I want to make a POST request through AJAX, and I also want to bind the whole class object to the request, and I want to receive that request with @requestParam annotation. I know it can be done with @requestBody annotation, but I am curious to know: can we do it with @requestParam annotation?

Ajax代码：

var restDTO{
    id: 3,
    name: "hello"
}

 $.ajax({
          url: url, 
          type: 'POST',
          dataType: 'json',
          contentType: 'application/json',
          mimeType: 'application/json',
          data: JSON.stringify({RestDTO : restDTO}),          
          success: function(data) 
    {
    }

我确实有RestDTO

I do have RestDTO

Class RestDTO 
{

    int id;
    String name;

    //getter and setter

}

在控制器中

public String content(@RequestParam RestDTO restDTO){...}

我该怎么做此代码运行？

What should I do the make this code run?

从ajax发送数据应该更改什么？

What should I change in sending data from ajax?

我是否需要更改服务器接收带有 @requestParam 注释的RestDto对象？

Do I need to change on server to receive an RestDto object with @requestParam annotation?

推荐答案

你不能，因为 @RequestParam 只是表示，一个方法的参数应绑定到一个 Web请求的参数。它无法映射到对象。要使用 @RequestParam ，您应该更改ajax请求：

You can't, because @RequestParam just indicates, that one method's parameter should be bound to a one web request's parameter. It can't do mapping to objects. For use @RequestParam you should change ajax request:

var restDTO{
   id: 3,
   name: "hello"
}

 $.ajax({
          url: url, 
          type: 'POST',
          data: restDTO,          
          success: function(data){
             ....
          }
});

JQuery将发送请求为 application / x-www-form-urlencoded 并将自动处理数据到参数。你的控制器的方法应如下所示：

JQuery will send request as application/x-www-form-urlencoded and will process data to parameters automatically. You controller's method should look like following:

@RequestMapping("/url")
public String content(@RequestParam Long id, @RequestParam String name){...}

为了自动将参数映射到对象，你可以使用 @ModelAttribute 注释：

For automatically map parameters to object you can use @ModelAttribute annotation:

@RequestMapping("/url")
public String content(@ModelAttribute RestDTO restDTO){...}

在这种情况下，javascript地图中的名称应与 RestDTO 中的属性名称匹配。

In this case, names in javascript map should match to names of properties in RestDTO.

通常，为相同目的创建的@ModelAttribute 和 @RequestBody ：用于将数据从请求绑定到方法（是否为基本类型的对象）。

Generally, @ModelAttribute and @RequestBody created for same purposes: for binding data from request to method (whether objects of primitive type).

我认为，当你使用html-forms和普通对象时， @ModelAttribute 会更方便。可以使用Spring功能，例如 modelAttribute 和路径。

I consider, that @ModelAttribute is more convenient, when you working with html-forms and plain objects. There is ready to use Spring abilities like modelAttribute and path.

当您需要手动控制数据时， @RequestBody 更灵活。此外，当您使用复杂对象时，它会更方便。

In its turn, @RequestBody more flexible, when you need manual control over data. Also, it is more convenient, when you're working with complex objects.

我个人更喜欢 @RequestBody 和json。

Personally me would prefer @RequestBody and json.

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