springboot使用拦截器判断是否登录 springboot使用拦截器判断是否登

springboot拦截器判断是否登录

实现拦截器的两个步骤
1、自定义拦截器
2、自定义配置类继承WebMvcConfigurerAdapter

springboot 增加拦截器判断是否登录

1、创建拦截器
2、继承WebMvcConfigureAdapter类
3、LoginController
4、未登录会自动跳转到登录页面

【springboot使用拦截器判断是否登录】
springboot拦截器判断是否登录
实现拦截器的两个步骤

自定义拦截器实现HandlerInterceptor接口
创建一个配置类继承WebMvcConfigurerAdapter类并重写addInterceptors方法

代码：

1、自定义拦截器

@Componentpublic class AdminLoginInterceptor implements HandlerInterceptor { //在请求处理之前调用,只有返回true才会执行请求@Overridepublic boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {//得到sessionHttpSession session = httpServletRequest.getSession(true); //得到对象Object admin = session.getAttribute("admin"); //判断对象是否存在if(admin!=null){return true; }else{//不存在则跳转到登录页httpServletResponse.sendRedirect(httpServletRequest.getContextPath()+"/login/adminLogin"); return false; }} //试图渲染之后执行@Overridepublic void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { } //在请求处理之后,视图渲染之前执行@Overridepublic void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { }}

2、自定义配置类继承WebMvcConfigurerAdapter

@SpringBootConfigurationpublic class AdminLoginAdapter extends WebMvcConfigurerAdapter { @AutowiredAdminLoginInterceptor adminLoginInterceptor; @Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(adminLoginInterceptor).addPathPatterns("/admin/**").excludePathPatterns("/login/**"); super.addInterceptors(registry); }}

springboot 增加拦截器判断是否登录
1、创建拦截器

package com.example.demo.interceptor; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * 〈一句话功能简述〉
* 〈拦截器〉 * * @author 丶Zh1Guo * @create 2018/11/22 * @since 1.0.0 */public class LoginInterceptor implements HandlerInterceptor {private Logger logger = LoggerFactory.getLogger(LoginInterceptor.class); // 在请求处理之前，只有返回true才会执行请求@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {logger.info("[拦截器]启动登录状态拦截"); // 得到sessionHttpSession session = request.getSession(); logger.info("[拦截器]sessionID:" + session.getId()); // 得到用户信息Object userInfo = session.getAttribute("userInfo"); //判断用户是否登录if (userInfo != null) {logger.info("[拦截器]用户已经登录,用户名，密码：" + session.getAttribute("userInfo")); return true; } else {//不存在跳转至登录页response.sendRedirect(request.getContextPath() + "/"); // 跳转到首页登录logger.info("[拦截器]用户没有登录,已跳转到:" + request.getContextPath() + "/"); return false; }}// 视图渲染后执行@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}// 请求处理后，视图渲染前@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {}}

2、继承WebMvcConfigureAdapter类
覆盖其addInterceptors接口,注册自定义的拦截器
@Configuration 注解一定要有

package com.example.demo.interceptor; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; /** * 〈一句话功能简述〉
* 〈自定义配置类〉 * * @author 丶Zh1Guo * @create 2018/11/22 * @since 1.0.0 */@Configurationpublic class LoginConfig implements WebMvcConfigurer {/*** 该方法用于注册拦截器* 可注册多个拦截器，多个拦截器组成一个拦截器链*/@Overridepublic void addInterceptors(InterceptorRegistry registry) {// addPathPatterns 添加路径// excludePathPatterns 排除路径registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/sys/*"); // 拦截sys路径下的url//.excludePathPatterns(""); }}

3、LoginController

/** * Copyright (C), 2017-2018, XXX有限公司 * FileName: LoginController * Author:丶Zh1Guo * Date:2018/11/22 11:10 * Description: 登录 * History: * * 作者姓名修改时间版本号描述 */package com.example.demo.controller; import com.example.demo.dao.UserDAO; import com.example.demo.pojo.User; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; /** * 〈一句话功能简述〉
* 〈登录〉 * * @author 丶Zh1Guo * @create 2018/11/22 * @since 1.0.0 */@Controllerpublic class LoginController {// 日志private Logger logger = LoggerFactory.getLogger(LoginController.class); @Autowiredprivate UserDAO userDAO; // 启动服务自动跳转登录//@RequestMapping(value = https://www.it610.com/article/{"/", "/login"})@RequestMapping(value = "https://www.it610.com/")public String login() {return "login"; }// 登录@RequestMapping(value = "https://www.it610.com/loginCheck", method = RequestMethod.POST)@ResponseBodypublic String loginCheck(HttpServletRequest request) {// 获取登录信息String userName = request.getParameter("userName"); String password = request.getParameter("password"); // 封装成对象User user = new User(); user.setUserName(userName); user.setPassword(password); // 校验用户信息User info = userDAO.checkUser(user); if (info != null) {request.getSession().setAttribute("userInfo", userName + "-" + password); logger.info("登录成功，用户名：" + userName + "密码：" + password); return "success"; } else {logger.info("登录失败，用户名：" + userName + "密码：" + password); return "fail"; }}}

4、未登录会自动跳转到登录页面