SpringMVC拦截器和异常处理器使用示例超详细讲解

public class FirstInterceptor implements HandlerInterceptor {
    //在控制器方法之前拦截
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("FirstInterceptor-preHandle");
        return true;
    }
    //在控制器方法之后拦截
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("FirstInterceptor-postHandle");
    }
    //在视图渲染之后拦截
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("FirstInterceptor-afterCompletion");
    }
}

<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="exceptionMappings">
        <props>
        	<!--
        		properties的键表示处理器方法执行过程中出现的异常
        		properties的值表示若出现指定异常时，设置一个新的视图名称，跳转到指定页面
        	-->
            <prop key="java.lang.ArithmeticException">error</prop>
        </props>
    </property>
    <!--
    	exceptionAttribute属性设置一个属性名，将出现的异常信息在请求域中进行共享
        设置异常信息保存在共享域中的键，默认保存在请求域，value为异常保存的键
    -->
    <property name="exceptionAttribute" value="exception"></property>
</bean>

//@ControllerAdvice将当前类标识为异常处理的组件
@ControllerAdvice
public class ExceptionController {
    //@ExceptionHandler用于设置所标识方法处理的异常
    @ExceptionHandler(ArithmeticException.class)
    //ex表示当前请求处理中出现的异常对象
    public String handleArithmeticException(Exception exception, Model model){
        model.addAttribute("exception", exception);
        return "error";
    }
}