Spring Boot自定义约束验证器未注入服务

使用 Spring Boot 开发应用程序时，我们经常需要对用户输入的数据进行验证。Spring Boot 提供了一种简单而强大的方式来实现数据验证，即通过自定义约束验证器。然而，有时候我们可能会遇到自定义约束验证器无法正常注入服务的问题。在本文中，我们将探讨这个问题，并提供一些解决方案。

java
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
@Component
public class CustomValidator implements Validator {
    private CustomService customService;
    
    @Autowired
    public CustomValidator(CustomService customService) {
        this.customService = customService;
    }
    @Override
    public boolean supports(Class clazz) {
        return CustomEntity.class.equals(clazz);
    }
    @Override
    public void validate(Object target, Errors errors) {
        CustomEntity entity = (CustomEntity) target;
        // 使用 customService 进行验证逻辑
        // ...
    }
}

java
import org.springframework.context.annotation.Configuration;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
@Configuration
public class ValidatorConfig {
    @Bean
    public Validator validator() {
        LocalValidatorFactoryBean factoryBean = new LocalValidatorFactoryBean();
        // 添加自定义约束验证器
        factoryBean.getConstraintValidatorFactory().registerConstraintValidator(CustomConstraint.class, new CustomValidator());
        return factoryBean;
    }
}