SpringBoot使用validation做参数校验的实现步骤

1.添加依赖

直接添加 hibernate-validator

<dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.0.2.Final</version>
        </dependency>

添加spring-boot-starter-validation

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
            <version>1.4.0.RELEASE</version>
        </dependency>

添加spring-boot-starter-web

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

2. 配置文件，如果想要设置fail_fast属性的话，true表示有一个参数出错即返回，默认的时检验所有的参数，那么必须要有配置文件

import org.hibernate.validator.HibernateValidator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.validation.beanvalidation.MethodValidationPostProcessor;
import org.springframework.validation.beanvalidation.SpringValidatorAdapter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

/**
 * hibernate参数验证配置
 */
@Configuration
public class ValidatorConfig extends WebMvcConfigurerAdapter {

    @Bean
    public Validator validator() {
        ValidatorFactory validatorFactory = Validation.byProvider(HibernateValidator.class)
                .configure()
                // 将fail_fast设置为true即可，如果想验证全部，则设置为false或者取消配置即可
                .failFast(true)
//                .addProperty("hibernate.validator.fail_fast", "true")
                .buildValidatorFactory();

        return validatorFactory.getValidator();
    }

    /**
     * requestParam方式的校验
     * @return
     */
    @Bean
    public MethodValidationPostProcessor methodValidationPostProcessor() {

        MethodValidationPostProcessor methodValidationPostProcessor = new MethodValidationPostProcessor();
        methodValidationPostProcessor.setValidator(validator());
        return methodValidationPostProcessor;
    }

    @Override
    public org.springframework.validation.Validator getValidator() {
        return new SpringValidatorAdapter(validator());
    }

}

其中methodValidationPostProcessor是对requestParam起作用

继承WebMvcConfigurerAdapter 并且重写getValidator()方法，是让spring的请求校验Validator使用我们上边的validator，让设置的failFast生效，具体可参考org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport#mvcValidator方法

3.统一异常处理

/**
     * hibernate-valid实体类形式接受参数验证失败
     * @param ex
     * @return
     */
    @ExceptionHandler(BindException.class)
    @ResponseBody
    public WebResult validationErrorHandler(BindException ex) {
        List<String> collect = ex.getBindingResult().getAllErrors()
                .stream()
                .map(ObjectError::getDefaultMessage)
                .collect(Collectors.toList());
        return new WebResult(Errors.INCORRECT_PARAM_FORMAT.getError(), StringUtils.join(collect, ";"));

    }

    /**
     * hibernate-valid实体类形式接受参数验证失败
     * @param ex
     * @return
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseBody
    public WebResult validationErrorHandler(MethodArgumentNotValidException ex) {
        List<String> collect = ex.getBindingResult().getAllErrors()
                .stream()
                .map(ObjectError::getDefaultMessage)
                .collect(Collectors.toList());
        return new WebResult(Errors.INCORRECT_PARAM_FORMAT.getError(), StringUtils.join(collect, ";"));

    }

    /**
     * RequestParam方式参数校验
     * @param ex
     * @return
     */
    @ExceptionHandler(ConstraintViolationException.class)
    @ResponseBody
    public WebResult validationErrorHandler(ConstraintViolationException ex) {
        List<String> errorInformation = ex.getConstraintViolations()
                .stream()
                .map(ConstraintViolation::getMessage)
                .collect(Collectors.toList());
        return new WebResult(Errors.INCORRECT_PARAM_FORMAT.getError(),StringUtils.join(errorInformation, ";"));
    }

4.使用

如果是@RequestParam这样直接写参数校验的话，在类上或者对应方法上加上Validated注解，如果是实体类接受的话，在参数中的实体前加上@Valid即可

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