15- 拦截器

</filter>

<filter-mapping>

<filter-name>encoding</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/mvc

https://www.springframework.org/schema/mvc/spring-mvc.xsd

http://www.springframework.org/schema/context

https://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="com.kuang.controller"/>

mvc:default-servlet-handler/

mvc:annotation-driven/

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">

<property name="prefix" value="/WEB-INF/jsp/"/>

<property name="suffix" value=".jsp" />

</bean>

mvc:interceptors

mvc:interceptor

<mvc:mapping path="/**"/>

<bean class="com.kuang.config.MyIntercepetor"/>

</mvc:interceptor>

</beans>

[](()3.写 controller 类

package com.kuang.controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class TestController {

@GetMapping("/t1")

public String test(){

System.out.println("TestController");

return "ok";

}

}

[](()4.编写一个拦截器

package com.kuang.config;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class MyIntercepetor implements HandlerInterceptor {

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

System.out.println("处理前");

// return false 就拦截住了 不让访问 t1 后面两个方法相当于日志

return true;//执行下一个拦截器 放行

}

}