java – 如何手动触发弹簧验证？

POJO字段上的带注释的弹簧验证在从json请求体创建时起作用.但是,当我手动创建相同的对象(使用setter)并想要触发验证时,我不知道该怎么做.

这是Registration类,它具有可以构建对象的Builder内部类.在构建方法中,我想触发弹簧验证.请滚动到底部并检查Builder.build()和Builder.valiate()方法以查看当前实现.我正在使用javax.validation.Validator来触发验证,但我更愿意在可能的情况下利用spring验证.

package com.projcore.dao;

import com.projcore.util.ToString;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.hibernate.validator.constraints.NotEmpty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.validation.ConstraintViolation;
import javax.validation.Valid;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.constraints.Size;
import java.util.List;
import java.util.Set;

/**
 * The data transfer object that contains the information of a Registration
 * and validation rules for attributes.
 */
@JsonIgnoreProperties(ignoreUnknown = true)
public final class Registration {
    private static final Logger LOGGER = LoggerFactory.getLogger(Registration.class);

    private String id;

    @NotEmpty
    @Size(max = 255)
    private String messageId;

    @NotEmpty
    @Size(max = 255)
    private String version;

    @Size(max = 255)
    private String system;

    public Registration() {
    }

    private Registration(Builder builder) {
        this.id = builder.id;
        this.messageId = builder.messageId;
        this.version = builder.version;
        this.system = builder.system;
    }

    public static Builder getBuilder() {
        return new Builder();
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getMessageId() {
        return messageId;
    }

    public void setMessageId(String messageId) {
        this.messageId = messageId;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public String getSystem() {
        return system;
    }

    public void setSystem(String system) {
        this.system = system;
    }

    @Override
    public String toString() {
        return ToString.create(this);
    }

    /**
     * Builder pattern makes the object easier to construct in one line.
     */
    public static class Builder {

        private String id;

        private String messageId;

        private String version;

        private String system;

        private Builder() {}

        public Builder id(String id) {
            this.id = id;
            return this;
        }

        public Builder messageId(String messageId) {
            this.messageId = messageId;
            return this;
        }


        public Builder version(String version) {
            this.version = version;
            return this;
        }

        public Builder system(String system) {
            this.system = system;
            return this;
        }

        public Registration build() {
            Registration entry = new Registration(this);

            // *** Would like to trigger spring validation here ***
            Set violations = validate(entry);
            if (violations.isEmpty())
                return entry;
            else
                throw new RuntimeException(violations.toString());
        }

        private Set validate(Registration entry) {
            Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
            Set<ConstraintViolation<Registration>> constraintViolations = validator.validate(entry);
            return constraintViolations;
        }

    }
}

验证在这里工作正常：

@RequestMapping(method = RequestMethod.POST)
@ResponseStatus(HttpStatus.CREATED)
Registration create(@RequestBody @Valid Registration registration) 

解：

删除了Registraion.Builder.validate().将Registraion.Builder.build()更新为：

    public Registration build() {
        Registration entry = new Registration(this);
        return (Registration) ValidatorUtil.validate(entry);
    }

ValidationUtil.java

package projcore.util;

import com.ericsson.admcore.error.InvalidDataException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.beanvalidation.SpringValidatorAdapter;

import javax.validation.Validation;
import javax.validation.Validator;
import java.util.Set;

public class ValidatorUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(ValidatorUtil.class);
    private static final Validator javaxValidator = Validation.buildDefaultValidatorFactory().getValidator();
    private static final SpringValidatorAdapter validator = new SpringValidatorAdapter(javaxValidator);

    public static Object validate(Object entry) {
        Errors errors = new BeanPropertyBindingResult(entry, entry.getClass().getName());
        validator.validate(entry, errors);
        if (errors == null || errors.getAllErrors().isEmpty())
            return entry;
        else {
            LOGGER.error(errors.toString());
            throw new InvalidDataException(errors.getAllErrors().toString(), errors);
        }
    }
}

InvalidDataException.java

package projcore.error;

import org.springframework.validation.Errors;

/**
 * This exception is thrown when the dao has invalid data.
 */
public class InvalidDataException extends RuntimeException {
    private Errors errors;

    public InvalidDataException(String msg, Errors errors) {
        super(msg);
        setErrors(errors);
    }

    public Errors getErrors() {
        return errors;
    }

    public void setErrors(Errors errors) {
        this.errors = errors;
    }
}

解决方法:

Spring为JSR-303 Bean Validation API提供了完全支持.这包括方便地支持将JSR-303实现引导为Spring bean.这允许在应用程序中需要验证的任何地方注入javax.validation.Validator.

使用LocalValidatorFactoryBean将默认的JSR-303 Validator配置为Spring bean：

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

上面的基本配置将触发JSR-303使用其默认引导机制进行初始化. JSR-303提供程序(如Hibernate Validator)应该出现在类路径中并自动检测.

5.7.2.1注入验证器

LocalValidatorFactoryBean实现javax.validation.Validator和org.springframework.validation.Validator.您可以将对这两个接口之一的引用注入需要调用验证逻辑的bean中.

如果您希望直接使用JSR-303 API,请注入对javax.validation.Validator的引用：

// JSR-303 Validator
import javax.validation.Validator;

@Service
public class MyService {

    @Autowired
    private Validator validator;

}

如果您的bean需要Spring Validation API,则引用对org.springframework.validation.Validator的引用：

// Spring Validator
import org.springframework.validation.Validator;

@Service
public class MyService {

    @Autowired
    private Validator validator;

}

这是一个很好的例子
Using JSR 303 with “classic” Spring Validators (enter the SpringValidatorAdapter)

This link is very helpful. Wrapping javax.validation.Validator in
org.springframework.validation.beanvalidation.SpringValidatorAdapter
helped deal with errors consistently. Can you add this as an answer so
that I can accept it

和
Spring doc here

标签：java,spring,spring-boot,bean-validation
来源： https://codeday.me/bug/20191007/1868544.html