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# 全局异常

package com.cy.myblog.controller.aspect;import javax.servlet.http.HttpServletRequest;import org.apache.shiro.ShiroException;import org.apache.shiro.authc.IncorrectCredentialsException;import org.apache.shiro.authc.LockedAccountException;import org.apache.shiro.authc.UnknownAccountException;import org.apache.shiro.authz.AuthorizationException;import org.springframework.util.StringUtils;import org.springframework.web.bind.annotation.ExceptionHandler;import org.springframework.web.bind.annotation.RestControllerAdvice;import com.cy.myblog.common.ex.ServiceException;import com.cy.myblog.common.vo.JsonResult;import com.cy.myblog.controller.BaseController;import com.cy.myblog.controller.ex.NoLoginException;import com.cy.myblog.controller.ex.PageUnfoundException;import com.cy.myblog.service.ex.ArgumentValidFaildException;import com.cy.myblog.service.ex.DataUnfoundException;import com.cy.myblog.service.ex.DuplicationKeyException;import com.cy.myblog.service.ex.PropertyValidFaildException;import lombok.extern.slf4j.Slf4j;//异常(last) -> view@Slf4j@RestControllerAdvicepublic class GlobalExceptionHandler extends BaseController{
   		@ExceptionHandler({
   ServiceException.class , ShiroException.class})	public JsonResult doExceptionHandle(Throwable e , HttpServletRequest r )  {
   		log.error("request URL:{} , Exception:{}" ,r.getRequestURL(), e.toString()); //URL 详尽的资源信息		JsonResult j = new JsonResult();		j.setState(FAIL);				//shrio 异常		if(e instanceof UnknownAccountException) {
   			setMessage(j, e,"账户不存在");		}else if(e instanceof LockedAccountException) {
   			setMessage(j, e, "账户状态异常");		}else if(e instanceof IncorrectCredentialsException) {
   			setMessage(j, e, "密码不正确");		}else if(e instanceof AuthorizationException) {
   			setMessage(j, e, "没有此操作权限");		}else		//自定义 controller 异常		if(e instanceof NoLoginException) {
   			setMessage(j, e, "请登录");		}else if(e instanceof PageUnfoundException){
   			setMessage(j, e, "404 页面找不到了");		}else		//自定义 servicer 异常		if(e instanceof ArgumentValidFaildException) {
   			setMessage(j, e, "参数异常");		}else if(e instanceof DataUnfoundException) {
   			setMessage(j, e, "数据不存在");		}else if(e instanceof DuplicationKeyException) {
   			setMessage(j, e, "键值不能重复");		}else if(e instanceof PropertyValidFaildException) {
   //校验异常			setMessage(j, e, "校验异常!");			PropertyValidFaildException ex = (PropertyValidFaildException) e; 			j.setData(ex.getErrors());		}		else {
   			setMessage(j, e, "系统维护中");			log.error("Exception {}" , e.getMessage());		}		return j;	}	/**	 * 如果没有异常描述,使用默认异常描述	 * @param j json 结果串,往message添加异常描述	 * @param e 异常	 * @param message 默认异常描述	 */	private void setMessage(JsonResult j , Throwable e , String message) {
   		if(StringUtils.isEmpty(e.getMessage())) {
   			j.setMessage(message);		}else{
   			j.setMessage(e.getMessage());		}	}	}

# 是什么

# 通常有什么

springboot 中

##ExceptionHandlerExceptionResolver

开发中，通常都加上 <mvc:annotaion-driven /> 注解，所以，下面重点讲 加注解后 替换的 ExceptionHandlerExceptionResolver

## ResponseStatusExceptionResolver

写在异常类上

写在方法上

## DefaultHandlerExceptionResolver

处理特定异常的

## SimpleMappingExceptionResolver

(这里views配置里面改了，)

debugger

exceptionAttribute 是属性名

exceptionAttribute 默认值 是 exception

因此，可以在 配置里面 改 异常的名字

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