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;

//传统方式处理异常以及自定义异常
@Component
public class GlobalExceptionResolver implements HandlerExceptionResolver
{
    //resolveException：当Controller中任意一个方法出现异常时，如果该控制器的方法没有自己处理异常（try catch），则会进入此方法
    //参数一 request：当前请求对象
    //参数二 response：当前请求对应响应对象
    //参数三 o：当前出现错误的方法对象
    //参数四 e：出现的异常对象
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e)
    {
        ModelAndView modelAndView = new ModelAndView();
        if(e instanceof MyException)
        {
            modelAndView.setViewName("MyException.html");
        }
        else
        {
            modelAndView.setViewName("500.html");
        }
        return modelAndView;
    }
}


//自定义异常
public class MyException extends RuntimeException
{
    public MyException()
    {
    }

    public MyException(String message)
    {
        super(message);
    }
}