Spring@Valid注釋不能用作驗證dto欄位？

我已經檢查了許多其他有關它的問題，但我找不到解決方案，我錯過了哪里？

這是控制器方法：

package com.nishberkay.nishcustomer.controller;

import com.nishberkay.nishcustomer.dto.request.CustomerAddRequestDto;
import com.nishberkay.nishcustomer.dto.request.CustomerUpdateRequestDto;
import com.nishberkay.nishcustomer.dto.response.CustomerDto;
import com.nishberkay.nishcustomer.entity.mysqlentity.Customer;
import com.nishberkay.nishcustomer.exception.InvalidRequestException;
import com.nishberkay.nishcustomer.service.CustomerService;
import org.modelmapper.ModelMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

@RestController
@RequestMapping("/customer")
@Validated
public class CustomerController {


    private CustomerService customerService;
    private ModelMapper modelMapper;

    @Autowired
    public CustomerController(CustomerService customerService, ModelMapper modelMapper) {
        this.customerService = customerService;
        this.modelMapper = modelMapper;
    }

    @PutMapping
    public CustomerDto updateCustomer(@Valid @RequestBody CustomerUpdateRequestDto customerDto,
                                      BindingResult bindingResult) throws Exception {
        if (bindingResult.hasErrors()) {
            String errorMessage = bindingResult.getAllErrors().get(0).getDefaultMessage();
            throw new InvalidRequestException(errorMessage);
        }
        Customer customer = modelMapper.map(customerDto, Customer.class);
        return modelMapper.map(customerService.update(customer), CustomerDto.class);
    }
}

我的 dto 是：

import javax.validation.constraints.NotNull;

@Data
public class CustomerUpdateRequestDto {

    @NotNull
    private int id;

    @NotNull
    private String firstName;

    @NotNull
    private String lastName;
}

我的問題是（也許@Valid 是否真的有效，我不確定），當我使用郵遞員請求除錯它時：

{
    "firstName" : "berkayaaasd",
    "lastName" : "dada"
}

我期待某種訊息，例如“Id 不能為空”，但id 欄位將顯示為 0，所以這就是為什么我認為@Valid可能正在作業但還有其他問題。

這是 pom 依賴項：

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>2.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.modelmapper</groupId>
            <artifactId>modelmapper</artifactId>
            <version>2.3.8</version>
        </dependency>
    </dependencies>

uj5u.com熱心網友回復：

這里的問題是您將您定義id為原始型別，它永遠不能為空。

如果您選擇盒裝型別（Integer在這種情況下），這應該可以。

所以在你的 DTO 中：

import javax.validation.constraints.NotNull;

@Data
public class CustomerUpdateRequestDto {
    @NotNull
    private Integer id;
    ...
}

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