springboot使用拦截器判断是否登录

springboot使用-判断是否登录

目录springboot-判断是否登录实现-的两个步骤1、自定义-2、自定义配置类继承WebMvcConfigurerAdapterspringboot 增加-判断是否登录1、创建-2、继承WebMvcConfigureAdapter类3、LoginController4、未登录会自动跳转到登录页面

springboot-判断是否登录

实现-的两个步骤

自定义-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-

@Component

public class AdminLoginInterceptor implements HandlerInterceptor {

// 在请求处理之前调用,只有返回true才会执行请求

@Override

public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

// 得到session

HttpSession 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

@Override

public 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

@Override

public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

}

}

2、自定义配置类继承WebMvcConfigurerAdapter

@SpringBootConfiguration

public class AdminLoginAdapter extends WebMvcConfigurerAdapter {

@Autowired

AdminLoginInterceptor adminLoginInterceptor;

@Override

public void addInterceptors(InterceptorRegistry registry) {

registry.addInterceptor(adminLoginInterceptor).addPathPatterns("/admin/**").excludePathPatterns("/login/**");

super.addInterceptors(registry);

}

}

springboot 增加-判断是否登录

1、创建-

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〉

* 〈-〉

*

* @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

@Override

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

logger.info("[-]启动登录状态拦截");

// 得到session

HttpSession session = request.getSession();

logger.info("[-]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("[-]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("[-]用户没有登录,已跳转到:" + request.getContextPath() + "/");

return false;

}

}

// 视图渲染后执行

@Override

public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

}

// 请求处理后，视图渲染前

@Override

public 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-

@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

*/

@Configuration

public class LoginConfig implements WebMvcConfigurer {

/**

* 该方法用于注册-

* 可注册多个-，多个-组成一个-链

*/

@Override

public 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:

* http://

*/

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

*/

@Controller

public class LoginController {

// 日志

private Logger logger = LoggerFactory.getLogger(LoginController.class);

@Autowired

private UserDAO userDAO;

// 启动服务自动跳转登录

// @RequestMapping(value = {"/", "/login"})

@RequestMapping(value = "/")

public String login() {

return "login";

}

// 登录

@RequestMapping(value = "/loginCheck", method = RequestMethod.POST)

@ResponseBody

public 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

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