在spring mvc中利用spring-session+redis实现分布式session

背景

　　平时部署项目过程中可能会遇到一个程序发布到多台服务器上，通过Nginx代理请求的情况，那么某个用户在一台服务器上登录成功过后，就不用在其他服务器上再登录了，这个时候就需要用到今天说的东西了。

1、maven包添加

<dependency>
    <groupId>org.springframework.session</groupId>
    <artifactId>spring-session-data-redis</artifactId>
<version>1.2.1.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework.session</groupId>
    <artifactId>spring-session</artifactId>
    <version>1.2.1.RELEASE</version>
</dependency>

2、在spring-redis.xml中添加，其中重写RedisSerializer文件，可以点击这里查看

<!-- spring session -->
    <bean id="stringRedisSerializer"
        class="org.springframework.data.redis.serializer.StringRedisSerializer" />
    <bean id="GenericToStringSerializer"
        class="centaline.small.course.tool.GenericFastJson2JsonRedisSerializer" />
    <bean id="redisHttpSessionConfiguration"
        class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
        <property name="maxInactiveIntervalInSeconds" value="28800"></property>
        <property name="redisNamespace" value="XX(自定义名称)" />
    </bean>
    <bean id="springSessionDefaultRedisSerializer"
        class="xx.xx.xx.xx.xx （重写RedisSerializer文件路径）" />

    <bean id="defaultCookieSerializer"  
        class="org.springframework.session.web.http.DefaultCookieSerializer">  
        <property name="cookieName" value="XX_SESSION_ID(自己项目的sessionID名称)" />  
        <property name="cookiePath" value="/" />  
    </bean>  
           
     <bean id="cookieHttpSessionStrategy"  
        class="org.springframework.session.web.http.CookieHttpSessionStrategy">  
        <property name="cookieSerializer" ref="defaultCookieSerializer" />  
    </bean> 

3、在登录成功后设置session和平时一样，附上工具类。

public class SessionUtils {

    @Resource(name = "sessionRepository")
    private SessionRepository<ExpiringSession> sessionRepository;

    private static final String SESSION_NAME = "LOGIN_INFO_SESSION";

    @Autowired
    private HttpSession httpSession;

    public String getSessionId() {
        String sessionId = httpSession.getId();
        return sessionId;
    }

    public LoginInfo getLoginInfo() {
        LoginInfo loginInfo = (LoginInfo) httpSession.getAttribute(SESSION_NAME);
        return loginInfo;
    }

    public String setLoginInfo(LoginInfo loginInfo) {
        String sessionId = httpSession.getId();
        httpSession.setAttribute(SESSION_NAME, loginInfo);
        return sessionId;
    }

    public void logout() {
        httpSession.removeAttribute(SESSION_NAME);
    }

    public LoginInfo getLoginInfoBySessionId(String sessionId) {
        ExpiringSession expiringSession = sessionRepository.getSession(sessionId);
        LoginInfo loginInfo = (LoginInfo) expiringSession.getAttribute(SESSION_NAME);
        return loginInfo;
    }
}