JAVA高级面试进阶训练营视频教程

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　　@ExceptionHandler与@Validated @RequestBody 三者配合使用可以很好的做到入参校验，具体demo如下：

 

接口

import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;

import com.xx.common.core.CommonResult;
import com.xx.product.input.dto.ProductDetailCollectParam;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

@Api(tags = "商品详情页接口")
@RequestMapping(value = "/product")
public interface ProductDetailService {

	@PostMapping("/collect")
	@ApiOperation(value = "收藏商品接口")
	public CommonResult collectProduct(@RequestBody @Validated ProductDetailCollectParam productDetailCollectParam);
	
}

　　

入参类

import javax.validation.constraints.NotBlank;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

@Data
@ApiModel(value = "商品详情页入参")
public class ProductDetailCollectParam {

    @NotBlank(message = "用户openid不能为空")
    @ApiModelProperty(value = "用户openid")
    private String openid;
    
    @NotBlank(message = "商品id不能为空")
    @ApiModelProperty(value = "商品id")
    private String id;
}

　　

全局捕获异常类

import org.springframework.web.bind.annotation.RestControllerAdvice;
import java.util.List;
import javax.validation.ConstraintViolationException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import com.xx.common.core.CommonResult;

import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@RestControllerAdvice
public class GlobalExecptionHandler {

    /**
     * 全局异常拦截
     * @param e
     * @return
     */
    @ExceptionHandler(Exception.class)
    public CommonResult handler(Exception exception) {
        
        StringBuilder errMsg = new StringBuilder();
        // 方法参数无效 异常
        if(exception instanceof MethodArgumentNotValidException) {
           BindingResult  bindResult = ((MethodArgumentNotValidException) exception).getBindingResult();
           List<FieldError> fieldErrorList = bindResult.getFieldErrors();
            fieldErrorList.forEach(fieldErrors -> {
                FieldError fieldError = fieldErrors;
                if (StrUtil.isNotBlank(errMsg.toString())) {
                    errMsg.append(",");
                }
                errMsg.append(fieldError.getDefaultMessage());
            }
           );
           
        }else if (exception instanceof ConstraintViolationException) {
            // 约束冲突异常
            
        }
//        log.error("异常：",exception);
        return CommonResult.failed(errMsg.toString());
    }

　　

参考链接：https://www.cnblogs.com/cjyboy/p/11465876.html

参考链接：https://blog.csdn.net/lzhcoder/article/details/98870852