springboot自定义异常+全局异常处理

一、首先自定义异常

@Data
@NoArgsConstructor
public class MyException extends RuntimeException{
    
    

    private static final String code = "C0001";

    private String message;

    public MyException(String message) {
    
    
//        继承父类的错误信息
        super(message);
        this.message = message;
    }

    public String getCode() {
    
    
        return code;
    }

    public String getMessage() {
    
    
        return message;
    }

}

二、实现全局异常捕获

@ControllerAdvice
public class GlobalExceptionHandler {
    
    

    @ResponseBody
    @ExceptionHandler(MyException.class)
    public ResultVo handlerRuntimeException(MyException e){
    
    
    // 捕获这个异常后需要返回给前端显示
        return new ResultVo(e.getCode(),e.getMessage());
    }

三、将该异常在方法内使用throw抛出，如果在方法上使用throws抛出将不能捕获

public PageResultVo listCate(int pageNum,int rows){
    
    
            log.info("查询全部分类");
            if (pageNum != 2){
    
    
                throw new MyException();
            }
            PageHelper.startPage(pageNum,rows);
            List<SecCateVo> secCate = cateMapper.getSecCate();
            PageInfo pageInfo = new PageInfo(secCate);
            return new PageResultVo<>("00000","查询成功",pageInfo.getTotal(),pageInfo.getList());
    }