Java Spring 客户验证器不工作

Question

我正在尝试为我的 Java Spring API 创建自定义验证规则。我有

CredentialCreateDTO

，它有一个名为

validRedirectUris

的字符串数组。我正在尝试检查

validRedirectUris

中的每个字符串是否都是有效的 URL。

这是我的代码：

package main.controller;

import main.dto.credentials.CredentialCreateDTO;
import main.model.Credential;
import main.response.BaseResponse;
import main.service.CredentialsService;

import jakarta.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/oauth/credentials")
public class CredentialsController {

    private final CredentialsService credentialsService;

    @Autowired
    public CredentialsController(CredentialsService credentialsService) {
        this.credentialsService = credentialsService;
    }

    @PostMapping("")
    public ResponseEntity<BaseResponse<Credential>> createCredentials(@Valid @RequestBody CredentialCreateDTO credentialCreateDto) {
        Credential credential = credentialsService.createCredentials(credentialCreateDto);
        BaseResponse<Credential> response = new BaseResponse<Credential>(credential, "credential", "/oauth/credentials");
        return ResponseEntity.ok(response);
    }
}

package main.dto.credentials;

import main.util.ValidUrl;

import java.util.List;

import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Size;
import lombok.Getter;
import lombok.Setter;
import org.springframework.validation.annotation.Validated;

@Getter
@Setter
public class CredentialCreateDTO {
    @NotNull(message = "validRedirectUris cannot be null")
    @Size(min = 1, message = "validRedirectUris must have at least one element")
    @ValidUrl(message = "Invalid URL")
    private List<String> validRedirectUris;

    @NotNull(message = "scopes cannot be null")
    @Size(min = 1, message = "validRedirectUris must have at least one element")
    private List<String> scopes;

    // Constructor
    public CredentialCreateDTO(List<String> validRedirectUris, List<String> scopes) {
        this.validRedirectUris = validRedirectUris;
        this.scopes = scopes;
    }

    // Default constructor for deserialization
    public CredentialCreateDTO() {
    }
}

package main.util;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;

@Documented
@Constraint(validatedBy = UrlValidator.class)
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ValidUrl {
    String message() default "Invalid URL";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}

package main.util;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.net.URI;
import java.util.List;

public class UrlValidator implements ConstraintValidator<ValidUrl, List<String>> {

    @Override
    public void initialize(ValidUrl constraintAnnotation) {
    }

    @Override
    public boolean isValid(List<String> urls, ConstraintValidatorContext context) {
        if (urls == null) {
            return true; // Use @NotNull if null is not allowed
        }

        for (String url : urls) {
            try {
                URI uri = new URI(url);
                uri.toURL();
            } catch (Exception e) {
                return false;
            }
        }
        return true;
    }
}

我尝试通过添加 System.outs、断点等进行调试。

尽管编译和运行正确，但它似乎没有运行 .isValid 函数。

Answer 1

您的 @RestController 上缺少 @Validated 注释。如果没有它，SpringMVC 就不会验证方法的参数。