SpringMVC拦截器之拦截器入门代码

SpringMVC拦截器之拦截器入门代码

1.编写拦截器的类代码如下:

package com.txw.controller.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 *自定义拦截器
 * @author Adair
 */
@SuppressWarnings("all")      // 注解警告信息
public class MyInterceptor1 implements HandlerInterceptor {
    
    
    /**
     * 预处理,controller方法执行前
     * return true 放行,执行下一个拦截器,如果没有,执行controller中的方法
     * return false不放行
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    
    
        System.out.println("MyInterceptor1执行了...前1111");
        return true;
    }
}

2.在resource目录下修改springmvc.xml的代码如下:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 开启注解扫描 -->
    <context:component-scan base-package="com.txw"/>
    <!-- 视图解析器对象 -->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!--前端控制器,哪些静态资源不拦截-->
    <mvc:resources location="/css/" mapping="/css/**"/>
    <mvc:resources location="/images/" mapping="/images/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/>
    <!--配置拦截器-->
    <mvc:interceptors>
        <!--配置拦截器-->
        <mvc:interceptor>
            <!--要拦截的具体的方法-->
            <mvc:mapping path="/user/*"/>
            <!--不要拦截的方法-->
            <!--<mvc:exclude-mapping path=""/>-->
            <!--配置拦截器对象-->
            <bean class="com.txw.controller.interceptor.MyInterceptor1"/>
        </mvc:interceptor>
    </mvc:interceptors>
    <!-- 开启SpringMVC框架注解的支持 -->
    <mvc:annotation-driven />
</beans>

3.修改success.jsp的代码如下:

<%--
  Created by IntelliJ IDEA.
  User: adair
  Date: 2020/7/7 0007
  Time: 15:54
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>成功页面</title>
</head>
<body>
    <h3>执行成功!!!!</h3>
    <% System.out.println("success.jsp执行了...");%>
</body>
</html>

4.使用Tomcat服务运行如图所示:
在这里插入图片描述
5.通过浏览器访问http://localhost:8080/如图所示:在这里插入图片描述
6.点击拦截器,会跳转到如图所示的界面:
在这里插入图片描述
7.控制台打印结果如图所示:在这里插入图片描述

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转载自blog.csdn.net/weixin_40055163/article/details/109215704