Controller

这边以一个接口为例，加上@Validated会校验接口方法入参

@RestController
@RequiredArgsConstructor
@Api(tags = {"事件接口"})
public class EventController {

    private final EventService eventService;
    
    @GetMapping("/xxx")
    public ResultBody<Page<Event>> getEvent(@Validated EventPageQuery eventPageQuery) throws MetaMysqlException {
        return eventService.getEvent(eventPageQuery);
    }
}

入参DTO

被校验的DTO，属性字段应注解上校验规则，比如这里的@NotNull。除此外还有很多其他注解，百度。。

package com.rycem.meta.entity.event;

import lombok.Getter;
import lombok.Setter;

import javax.validation.constraints.NotNull;

/**
 * @ClassName EventPageQuery
 * @Description 分页查询包装类
 * @Author 陈铭
 * @Date 15:37 2023/4/17
 * @Version 1.0
 **/
@Getter
@Setter
public class EventPageQuery {

    @NotNull(message = "页面大小必须指定")
    private Integer pageSize;
    @NotNull(message = "页码数必须指定")
    private Integer pageNum;
    @NotNull(message = "事件分组Id必须指定")
    private Integer groupId;
}

RestControllerAdvice

接口入参校验失败会抛BindException异常，可以使用@RestControllerAdvice进行捕获，统一处理

package com.rycem.meta.except;

import com.rycem.common.core.utils.uuid.UUID;
import com.rycem.meta.entity.ResultBody;
import lombok.extern.slf4j.Slf4j;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**
 * @ClassName MetaExceptionHandler
 * @Description 接口异常处理类
 * @Author 陈铭
 * @Date 16:32 2023/4/10
 * @Version 1.0
 **/
@Slf4j
@RestControllerAdvice("com.rycem.meta.controller")
public class MetaExceptionHandler {

    @ExceptionHandler({BindException.class})
    public ResultBody<String> handleValidException(Exception e) {
        log.error(e.getMessage());
        return ResultBody.failure("【请检查接口入参，接口入参验证不通过】", UUID.randomUUID().toString(), "");
    }
}