1.新建Maven项目，pom.xml加入如下：

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	
	<properties>
		<weixin-java-mp.version>2.8.0</weixin-java-mp.version>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.build.locales>zh_CN</project.build.locales>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<!-- <exclusions> <exclusion> <groupId>com.fasterxml.jackson.core</groupId> 
				<artifactId>jackson-databind</artifactId> </exclusion> </exclusions> -->
		</dependency>
		<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.47</version>
		</dependency>
		<!-- Testing Dependencies -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>
		<!--spring-session 与redis应用基本环境配置,需要开启redis后才可以使用，不然启动Spring boot会报错 -->
		<dependency>
			<groupId>org.springframework.session</groupId>
			<artifactId>spring-session-data-redis</artifactId>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-pool2</artifactId>
		</dependency>
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
		</dependency>

	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<maimClass>com.meiteedu.WxMpApplication</maimClass>
				</configuration>
				<executions>
					<execution>
						<goals>
							<goal>repackage</goal>
						</goals>
					</execution>
				</executions>

			</plugin>
		</plugins>
	</build>

2.新建redis的配置类

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;

/**
 * 这个类用配置redis服务器的连接
 * 
 * @author mayn
 *
 */
// maxInactiveIntervalInSeconds为SpringSession的过期时间（单位：秒）
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 1800)
public class SessionConfig {

	// 冒号后的值为没有配置文件时，制动装载的默认值
	@Value("${redis.hostname:localhost}")
	String hostName;
	
	@Value("${redis.port}")
	int port;
	
	@Value("${redis.password}")
	String password;

	@SuppressWarnings("deprecation")
	@Bean
	public JedisConnectionFactory connectionFactory() {
		JedisConnectionFactory connection = new JedisConnectionFactory();
		connection.setPort(port);
		connection.setHostName(hostName);
		connection.setPassword(password);
		return connection;
	}
}

3.新建初始化redis配置类

import org.springframework.session.web.context.AbstractHttpSessionApplicationInitializer;

//初始化Session配置
public class SessionInitializer extends AbstractHttpSessionApplicationInitializer{
    public SessionInitializer() {
        super(SessionConfig.class);
    }
}

4.新建一个启动类

@SpringBootApplication
@RestController
public class TestSessionApp {
	
	@Value("${server.port}")
	private String serverPort;

	// 创建session 会话
	// http://127.0.0.1:8080/createSession?name=aaa
	@RequestMapping("/createSession")
	public String createSession(HttpServletRequest request, String name) {
		HttpSession session = request.getSession();
		System.out.println("存入Session sessionid:信息" + session.getId() + ",name:" + name + ",serverPort:" + serverPort);
		session.setAttribute("name", name);
		return serverPort + "success";
	}

	// 获取session 会话
	@RequestMapping("/getSession")
	public Object getSession(HttpServletRequest request) {
		// 参数为true的情况下，客户端使用对应的sessionid查不到对应的session，会创建一个新的session
		// 参数为false的情况下，客户端使用对应的sessionid查不到对应的session，不会创建一个新的session
		HttpSession session = request.getSession(false);
		
		if (session == null) {
			return serverPort + "服务器上没有session...";
		}
		
		System.out.println("获取Session sessionid:信息" + session.getId() + ",serverPort:" + serverPort);
		Object value = session.getAttribute("name");
		return serverPort + "-" + value;
	}
	
	@RequestMapping("/getServerPort")
	public String getServerPort () {
		return serverPort;
	}

	public static void main(String[] args) {
		SpringApplication.run(TestSessionApp.class, args);
	}
}

5.启动两个集群环境，端口号分别为8080和8081

访问http://127.0.0.1:8080/createSession?name=aaa，往8080服务器session上存取数据

此时8081服务器的session也可以拿到8080服务器存取的数据了

查看redis，session保存在redis里面