4.实现 HandlerExceptionResolver 接口处理异常

@Configuration
public class GlobalException1 implements HandlerExceptionResolver{
    @Override
    public ModelAndView resolveException(HttpServletRequest arg0,
            HttpServletResponse arg1, Object arg2, Exception ex) {
        ModelAndView mv=new ModelAndView();
        mv.addObject("error",ex.toString());
        if(ex instanceof ArithmeticException){
            mv.setViewName("ArithmeticExceptionPage");
            return mv;
        }
        if(ex instanceof NullPointerException){
            mv.setViewName("NullPointerExceptionPage");
            return mv;
        }
        mv.setViewName("DefaultPage");
        return mv;
    }