SpringBoot的异常处理

你的名字 2022-01-14 10:43 236阅读 0赞

**SpringBoot通过注解@ControllerAdive拦截所有由@Controller修饰的类。并根据异常类型进行响应的处理。**

**实例：**

import com.leyou.common.enums.ExceptionEnum;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    
    @ControllerAdvice    // 拦截所有由@Controller修饰的类,通用异常处理类
    public class CommonExceptionHandler {
    
        @ExceptionHandler(LyException.class)  // 可以写多个，用于拦截不同的异常
        public ResponseEntity<String> handlerException(LyException e){
            ExceptionEnum em = e.getExceptionEnum();
            return ResponseEntity.status(em.getCode()).body(em.getMsg()); // 获取到异常时的消息，返回Rest风格的响应
        }
    }

**自定义异常：**

import com.leyou.common.enums.ExceptionEnum;
    import lombok.AllArgsConstructor;
    import lombok.Getter;
    import lombok.NoArgsConstructor;
    
    @NoArgsConstructor
    @AllArgsConstructor
    @Getter
    public class LyException extends RuntimeException {
        private ExceptionEnum exceptionEnum;
    }

**自定义枚举类：**

import lombok.AllArgsConstructor;
    import lombok.Getter;
    import lombok.NoArgsConstructor;
    
    @Getter
    @AllArgsConstructor
    @NoArgsConstructor
    public enum ExceptionEnum {
    
        CATEGOTRY_NOT_FOND(404,"商品分类没查到")
        ;
        private int code;
        private String msg;
    }

测试：

import com.leyou.common.enums.ExceptionEnum;
    import com.leyou.common.exceptionEnum.LyException;
    import com.leyou.item.mapper.CategoryMapper;
    import com.leyou.item.pojo.Category;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.util.CollectionUtils;
    
    import java.util.List;
    
    @Service
    public class CategoryService {
    
        @Autowired
        private CategoryMapper categoryMapper;
    
        public List<Category> queryCategoryListByPid(Long pid) {
            Category category = new Category();
            category.setParentId(pid);
            List<Category> list = categoryMapper.select(category);
            if(CollectionUtils.isEmpty(list)){
                throw new LyException(ExceptionEnum.CATEGOTRY_NOT_FOND);
            }
            return null;
        }
    }