SpringBoot使用validation做参数校验的实现步骤

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 */@Configurationpublic 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

/** * 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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