SpringMVC框架（4）--异常处理

<!--配置简单映射异常处理器-->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <!--默认错误视图-->
    <property name="defaultErrorView" value="forward:/error/errorMsg.jsp"/>       
    <property name="exceptionMappings">
        <map>
            <!--除零异常视图-->
            <entry key="ArithmeticException" value="forward:/error/arithmetic.jsp"/>  
            <!--类型转换异常视图-->
            <entry key="ClassCastException" value="forward:/error/classCast.jsp"/>       
        </map>
    </property>
</bean>

public class MyExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest request,
    HttpServletResponse response, Object handler, Exception ex) {
        //创建ModelAndView
        ModelAndView modelAndView = new ModelAndView();
        //判断出现的异常是什么异常
        if (ex instanceof ArithmeticException){     //如果是除零异常
            //跳转到"forward:/error/arithmetic.jsp"
            modelAndView.setViewName("forward:/error/arithmetic.jsp");
        }else if (ex instanceof ClassCastException){   //如果类型转换异常
            modelAndView.setViewName("forward:/error/classCast.jsp");
        }else{  //其他异常,就跳转到exceptionPage页面
            modelAndView.setViewName("forward:/error/exceptionPage.jsp");
        }

        return modelAndView;
    }
}

<bean id="exceptionResolver" class="com.itheima.exception.MyExceptionResolver"/>