kotlin 和 @Valid Spring 注释 [英] kotlin and @Valid Spring annotation

问题描述

我有一个实体:

class SomeInfo(
        @NotNull @Pattern(regexp = Constraints.EMAIL_REGEX) var value: String) {
    var id: Long? = null
}

和控制器方法:

@RequestMapping(value = "/some-info", method = RequestMethod.POST)
public Id create(@Valid @RequestBody SomeInfo someInfo) {
       ...
    }

@Valid 注释不起作用.

似乎 Spring 需要一个默认的无参数构造函数，上面花哨的代码变得像这样丑陋(但有效):

It seems Spring needs a default parameterless constructor and fancy code above becomes in something ugly (but working) like this:

class SomeInfo() {

    constructor(value: String) {
            this.value = value
        }

        @NotNull @Pattern(regexp = Constraints.EMAIL_REGEX) 
        lateinit var value: String

        var id: Long? = null
    }

有什么好的做法可以让它不那么冗长吗?

Any good practice to make it less wordy?

谢谢.

推荐答案

似乎 Spring 需要将这些注释应用于一个字段.但是 Kotlin 会将这些注解应用到构造函数参数上.在应用注释时使用 field: 说明符使其适用于字段.以下代码应该适合您.

Seems Spring needs these annotations to be applied to a field. But Kotlin will apply these annotations to the constructor parameter. Use field: specifier when applying an annotation to make it apply to a field. The following code should work fine for you.

class SomeInfo(
    @field:NotNull
    @field:Pattern(regexp = Constraints.EMAIL_REGEX)
    var value: String
) {
    var id: Long? = null
}

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