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跟杨春娟学SpringBoot笔记：全局异常处理之如何使用HandlerExceptionResolver接口

完成：第一遍

1.全局异常处理之如何使用HandlerExceptionResolver接口？

步骤一:创建MyHandlerExceptionResolver.java

MyHandlerExceptionResolver.java

package com.springboot.demo.SpringBootDemoProject.error;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.HandlerExceptionResolver;import org.springframework.web.servlet.ModelAndView;@Configurationpublic class MyHandlerExceptionResolver implements HandlerExceptionResolver {
   	@Override	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,			Exception ex) {
   			ModelAndView modelAndView = new ModelAndView();		modelAndView.addObject("errorInfo", ex.getMessage());				if(ex instanceof NullPointerException) {
   			modelAndView.setViewName("error/error_null");		}else {
   			modelAndView.setViewName("error/error_other");		}				return modelAndView;	}}

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