编写异常Advice

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package com.jhj.gulimall.product.exception;

import com.jhj.common.exception.BizCodeEnume;
import com.jhj.common.utils.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.HashMap;
import java.util.Map;

/**
 * @Description GulimallExceptionControllerAdvice
 * @Author jhj
 * @Date 2022/6/110:34
 **/
@Slf4j
//处理哪个包下的异常
@RestControllerAdvice(basePackages = "com.jhj.gulimall.product.controller")
public class GulimallExceptionControllerAdvice {
    

    //校验异常
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public R handleVaildExceptinon(MethodArgumentNotValidException e){
    
        log.error("检验错误{}",e.getMessage());
        HashMap<String, String> errorMap = new HashMap<>();
        e.getBindingResult().getFieldErrors().forEach((res)->{
    
            errorMap.put(res.getField(),res.getDefaultMessage());
        });
        return R.error(BizCodeEnume.VAILD_EXCEPTION.getCode(), BizCodeEnume.VAILD_EXCEPTION.getMsg()).put("data",errorMap);
    }

    //校验异常
    @ExceptionHandler(value = Throwable.class)
    public R handleVaildExceptinon(Throwable e){
    

        return R.error(BizCodeEnume.UNKNOW_EXCEPTION.getCode(), BizCodeEnume.UNKNOW_EXCEPTION.getMsg());
    }
}

配置异常返回枚举（非必要）

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package com.jhj.common.exception;

public enum BizCodeEnume {
    
    UNKNOW_EXCEPTION(10000,"系统未知异常"),
    VAILD_EXCEPTION(10001,"参数格式校验失败");

    private int code;
    private String msg;

    BizCodeEnume(int code, String msg) {
    
        this.code = code;
        this.msg = msg;
    }

    public int getCode() {
    
        return code;
    }

    public String getMsg() {
    
        return msg;
    }
}

除一些特定异常外 也可以自定义异常

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package com.jhj.gulimall.product.exception;

public class MyException extends RuntimeException{
    
    public MyException(String message) {
    
        super("我的自定义异常");
    }
}

作者声明

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如有问题，欢迎指正！