SSM统一异常处理方式

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 **系统遇到异常时，在程序中手动抛出，dao抛给service，service再抛给Controller，最后Controller抛给前端控制器，前端控制器调用全局异常处理器**

    

import org.apache.shiro.authz.UnauthorizedException;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class CustomExceptionResolver implements HandlerExceptionResolver {
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        if(ex instanceof UnauthorizedException){
            ModelAndView mv =  new ModelAndView();
            mv.setViewName("forward:/unauthorized.jsp");
            return mv;
        }else {
            ModelAndView mv =  new ModelAndView();
            mv.setViewName("error");
            mv.addObject("errorMsg","牛逼");
            mv.addObject("ex",ex);
            System.out.println(ex);
            return mv;
        }
    }
}