Spring Controller:尽管 @Valid 和 @Size 未验证 RequestParam

问题描述

我有一个简单的控制器方法:

I have a simple Controller method :

@GetMapping("/search")
    public List<Result> search(@RequestParam @Valid @NotNull @Size(min = 4) String query) {
        return searchService.search(query);
    }

当我省略查询"参数时，我得到一个 400 Bad Request，正如预期的那样.

When I omit the "query" parameter, I get a 400 Bad Request, as expected.

使用这些查询参数测试方法不起作用.

Testing the method with these query parameters doesn't work.

除了最后一个测试之外的所有测试都应该返回400 Bad Request".

All but the last test should return a "400 Bad Request".

"/search"             --> actual 400 Bad Request, test passes
"/search?query="      --> actual 200 Ok, expected 400 because @Size(min=4)
"/search?query=a"     --> actual 200 Ok, expected 400 because @Size(min=4)
"/search?query=ab"    --> actual 200 Ok, expected 400 because @Size(min=4)
"/search?query=abc"   --> actual 200 Ok, expected 400 because @Size(min=4)
"/search?query=abcd"  --> actual 200 Ok, test passes

为什么忽略@Size(min=4) 注释?

Why is the @Size(min=4) annotation being ignored?

推荐答案

验证 RequestParameters 不是开箱即用的.

Validating RequestParameters does not work like that out of the box.

您可以将参数包装在一个类中

You could wrap the parameters in a class like

class SearchRequest {
    @Size(min=4)
    @NotNull
    private String query;
    ...
}

然后将您的控制器代码更改为

Then change your controller code to

@GetMapping("/search")
public List<Result> search(@ModelAttribute @Valid SearchRequest searchRequest) {
    return searchService.search(searchRequest.getQuery());
}

现在这是一种方法，你想要的可能可以使用类上的@Validated 注释来实现，但我对此一无所知，但它似乎在这里涵盖:https://sdqali.in/blog/2015/12/04/validating-requestparams-and-pathvariables-in-spring-mvc/

Now this is one way to do it, what you want is probably achievable using the @Validated annotation on the class, but I don't know anything about that but it seems to be covered here: https://sdqali.in/blog/2015/12/04/validating-requestparams-and-pathvariables-in-spring-mvc/

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