如果不是Spring MVC中的bean，如何验证请求参数? [英] How to validate request parameter if it is not a bean in spring MVC?

问题描述

以下是我的Spring MVC REST服务中的POST端点.我想使用Spring验证框架来确保收到的列表不为空.我该怎么做?我是否必须在listOfLongs附近提供包装bean?

Below is a POST end point in my spring MVC REST service. I want to use spring validation frame work to make sure that list I receive is not empty. How do I do it? Do I have to provide wrapper bean to around listOfLongs?

    @RequestMapping(value = "/some/path", method = RequestMethod.POST)
    @ResponseBody
    public Foo bar(@Valid @NotEmpty @RequestBody List<Long> listOfLongs) {

     /*   if (listOfLongs.size() == 0) {
            throw new InvalidRequestException();
        }
     */

        // do some useful work
    }

请求主体是什么?

1) [123,456,789]
2) { listOfLongs : [123,456,789]}

推荐答案

提供包装bean是一个好习惯.

Providing a wrapper bean is a good practice.

class LongList {

 @NotEmpty
 private List<Long> listOfLongs;

 // Setters and Getters ...

}

然后，请求正文应为{ listOfLongs : [123,456,789]}

@RequestMapping(value = "/some/path", method = RequestMethod.POST)
@ResponseBody
public Foo bar(@Valid @RequestBody LongList listOfLongs) {   

    // do some useful work
}

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