Redis快速实现分布式session的方法详解

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.8</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-redis</artifactId>
    <version>1.4.7.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.springframework.session</groupId>
    <artifactId>spring-session-data-redis</artifactId>
</dependency>

spring.application.name=spring-boot-redis
server.port=9090
# 设置session的存储方式，采用redis存储
spring.session.store-type=redis
# session有效时长为15分钟
server.servlet.session.timeout=PT15M

## Redis 配置
## Redis数据库索引
spring.redis.database=1
## Redis服务器地址
spring.redis.host=127.0.0.1
## Redis服务器连接端口
spring.redis.port=6379
## Redis服务器连接密码（默认为空）
spring.redis.password=

@Slf4j
@RestController
@RequestMapping(value = "/user")
public class UserController {

    Map<String, User> userMap = new HashMap<>();

    public UserController() {
        //初始化1个用户，用于模拟登录
        User u1=new User(1,"user1","user1");
        userMap.put("user1",u1);
    }
}

 @GetMapping(value = "/login")
    public String login(String username, String password, HttpSession session) {
        //模拟数据库的查找
        User user = this.userMap.get(username);
        if (user != null) {
            if (!password.equals(user.getPassword())) {
                return "用户名或密码错误！！！";
            } else {
                session.setAttribute(session.getId(), user);
                log.info("登录成功{}",user);
            }
        } else {
            return "用户名或密码错误！！！";
        }
        return "登录成功！！！";
    }

    /**
     * 通过用户名查找用户
     */
    @GetMapping(value = "/find/{username}")
    public User find(@PathVariable String username) {
        User user=this.userMap.get(username);
        log.info("通过用户名={},查找出用户{}",username,user);
        return user;
    }

  /**
     *拿当前用户的session
     */
    @GetMapping(value = "/session")
    public String session(HttpSession session) {
        log.info("当前用户的session={}",session.getId());
        return session.getId();
    }

  /**
     * 退出登录
     */
    @GetMapping(value = "/logout")
    public String logout(HttpSession session) {
        log.info("退出登录session={}",session.getId());
        session.removeAttribute(session.getId());
        return "成功退出！！";
    }

 @Configuration
    public class SecurityInterceptor implements HandlerInterceptor {
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {
            HttpSession session = request.getSession();
            //验证当前session是否存在，存在返回true true代表能正常处理业务逻辑
            if (session.getAttribute(session.getId()) != null){
                log.info("session拦截器，session={}，验证通过",session.getId());
                return true;
            }
            //session不存在，返回false，并提示请重新登录。
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            response.getWriter().write("请登录！！！！！");
            log.info("session拦截器，session={}，验证失败",session.getId());
            return false;
        }
    }

@Slf4j
@Configuration
public class SessionCofig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new SecurityInterceptor())
                //排除拦截的2个路径
                .excludePathPatterns("/user/login")
                .excludePathPatterns("/user/logout")
                //拦截所有URL路径
                .addPathPatterns("/**");
    }
}