异常的分类

Exception分为运行时异常和非运行时异常

运行时异常：编译时不会报错，会在运行中报错，若空指针异常

非运行时异常：在编译时报错，如 IOException

全局异常抓取抛出
  • 自定义类设置校验规则
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//继承运行时异常类
public class ThrowException extends RuntimeException {

    //此类要继承运行时异常

    public ThrowException() {
        super();
    }

    public ThrowException(String message) {
        super(message);
    }

    public ThrowException(String message, Throwable cause) {
        super(message, cause);
    }

    public ThrowException(Throwable cause) {
        super(cause);
    }

    protected ThrowException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
    }
}
  • 设置handler抓取异常并返回
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@RestControllerAdvice
@Slf4j
public class ExceptionAdvice {

    //注明异常类
    @ExceptionHandler(value = ThrowException.class)
    @ResponseBody
    public ReturnDto ErrorHandler(ThrowException e) {
        log.error(e.getMessage(), e);
        //将抓取的异常返回
        return new ReturnDto(e.getMessage(), "406", null);
    }
}
  • 使用方式
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throw new ThrowException("此处主动抛出异常");