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修改异常处理方式4中的全局异常处理controller

package com.bjsxt.exception;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Properties;

/**
 * Created by Administrator on 2019/2/14.
 * 全局异常处理类,通过实现 HandlerExceptionResolver类做全局异常处理
 * 优点：相对于方法4可以传递异常信息
 */

@Configuration
public class GlobalException implements HandlerExceptionResolver{


    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest,
           HttpServletResponse httpServletResponse, @Nullable Object o, Exception e) {

        ModelAndView mv = new ModelAndView();
        //判断不同异常类型，做不同视图跳转
        if(e instanceof ArithmeticException){
            mv.setViewName("error_arithmetic");
        }
        if(e instanceof NullPointerException){
            mv.setViewName("error_nullPointer");
        }
        mv.addObject("msg", e.toString());
        return mv;
    }
}