全集异常处理

我们的全局异常处理一般都是在controller层捕获异常
核心注解：
（1）@RestControllerAdvice：用于controller层异常捕获
（2）@ResponseStatus(value=,reason=)：value属性设置异常的状态码，reaseon是异常的描述.
（3）@ExceptionHandler(value=)：value值表示异常的类型.

package com.komorebi.common;

import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.nio.file.AccessDeniedException;

@Slf4j
@RestControllerAdvice//用于controller层异常捕获
public class GlobalException {

    @ResponseStatus(HttpStatus.FORBIDDEN)
    //value值表示异常类别
    @ExceptionHandler(value = AccessDeniedException.class)
    public Result handler(AccessDeniedException e) {
        log.info("security权限不足：----------------{}", e.getMessage());
        return Result.fail("权限不足");
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public Result handler(MethodArgumentNotValidException e) {
        log.info("实体校验异常：----------------{}", e.getMessage());
        BindingResult bindingResult = e.getBindingResult();
        ObjectError objectError = bindingResult.getAllErrors().stream().findFirst().get();
        return Result.fail(objectError.getDefaultMessage());
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(value = IllegalArgumentException.class)
    public Result handler(IllegalArgumentException e) {
        log.error("Assert异常：----------------{}", e.getMessage());
        return Result.fail(e.getMessage());
    }

    @ResponseStatus(HttpStatus.BAD_REQUEST)
    @ExceptionHandler(value = RuntimeException.class)
    public Result handler(RuntimeException e) {
        log.error("运行时异常：----------------{}", e.getMessage());
        return Result.fail(e.getMessage());
    }

}