Spring验证器：同时具有注释和验证器实现

Question

是否可以同时拥有表单和注释约束的验证器？

例如，在表单对象中包含此字段：

@NotEmpty
private String date;

，然后在验证器中验证日期的模式。

我知道有模式注释，但我只是想看看是否可以使用这两种类型的验证。

Answer 1

这里是链接访问一个非常好的网站，其中解释了如何将 JSR-303 验证器与 spring 验证器结合起来。

接下来我将介绍我的有效解决方案。希望有帮助。

我的抽象验证器：

import java.util.Map;
import java.util.Set;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorFactory;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.validation.Errors;


public abstract class AbstractValidator implements org.springframework.validation.Validator, ApplicationContextAware,
    ConstraintValidatorFactory {

@Autowired
private Validator validator;

private ApplicationContext applicationContext;

public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
}

public <T extends ConstraintValidator<?, ?>> T getInstance(Class<T> key) {
    Map<String, T> beansByNames = applicationContext.getBeansOfType(key);
    if (beansByNames.isEmpty()) {
        try {
            return key.newInstance();
        } catch (InstantiationException e) {
            throw new RuntimeException("Could not instantiate constraint validator class '" + key.getName() + "'", e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException("Could not instantiate constraint validator class '" + key.getName() + "'", e);
        }
    }
    if (beansByNames.size() > 1) {
        throw new RuntimeException("Only one bean of type '" + key.getName() + "' is allowed in the application context");
    }
    return (T) beansByNames.values().iterator().next();
}

public boolean supports(Class<?> c) {
    return true;
}

public void validate(Object objectForm, Errors errors) {
    Set<ConstraintViolation<Object>> constraintViolations = validator.validate(objectForm);
    for (ConstraintViolation<Object> constraintViolation : constraintViolations) {
        String propertyPath = constraintViolation.getPropertyPath().toString();
        String message = constraintViolation.getMessage();
        errors.rejectValue(propertyPath, "", message);
    }
    addExtraValidation(objectForm, errors);
}

protected abstract void addExtraValidation(Object objectForm, Errors errors);

}

实际的验证器：

import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;

import ro.scorpionsoftware.demo3.dao.AbstractValidator;


@Component(value="doctorValidator")
public class DoctorValidator extends AbstractValidator {

    @Override
    protected void addExtraValidation(Object objectForm, Errors errors) {
        //perform typical validation
        //can autowire to context
    }


}

控制器：（最后它是 @Valid 与验证器的绑定）

@Controller
public class DoctorEditController {

@Autowired
    private DoctorValidator doctorValidator;

@RequestMapping(value = "/doctorEdit", method = RequestMethod.POST)
    public String processSubmit(
            @ModelAttribute("doctorForm") @Valid DoctorForm df,
            BindingResult result,
            ModelMap model) {
     ...
}
@InitBinder
    protected void initBinder(WebDataBinder binder) {
        binder.setValidator(doctorValidator);
    }
}

在上下文中声明 JSR-303 验证器：

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

通过这种方法，您可以在实际验证器和验证器中获取上下文您想要实现的任何其他自定义注释。

Answer 2

您可以将注释组合在一起以使用多个验证器，所以它会是这样的。

@NotEmpty
@Pattern("") // not sure of syntax here
@Target(ElementType.METHOD)
@Retention( RetentionPolicy.RUNTIME)
@Constraint(validatedBy = {})
@Documented
public @interface DatePattern {
    String message() default "";

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

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