安装Redis请参考：《
一、springboot集成redis并实现DB与缓存同步
1.添加redis及数据库相关依赖（pom.xml）
org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-redis 1.4.7.RELEASE org.mybatis.spring.boot mybatis-spring-boot-starter 1.3.1 mysql mysql-connector-java com.fasterxml.jackson.core jackson-databind org.springframework.boot spring-boot-starter-test test
2.添加数据库、mybatis、redis相关配置（application.properties）
#数据库相关配置spring.datasource.driverClassName=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://192.168.15.129:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=falsespring.datasource.username=rootspring.datasource.password=123456#Mybatis相关配置mybatis.type-aliases-package=com.lianjinsoft.pojomybatis.config-locations=classpath:mybatis/mybatis-config.xmlmybatis.mapper-locations=classpath:mybatis/mapper/*.xml#Redis相关配置#数据库索引（默认为0）spring.redis.database=0#服务器地址spring.redis.host=192.168.15.129#服务器连接端spring.redis.port=6379#服务器连接密码（默认为空）spring.redis.password=123456#连接池最大连接数（使用负值表示没有限制）spring.redis.pool.max-active=100#连接池最大阻塞等待时间（使用负值表示没有限制）spring.redis.pool.max-wait=10000#连接池中的最大空闲连接spring.redis.pool.max-idle=8#连接池中的最小空闲连接spring.redis.pool.min-idle=2#连接超时时间（毫秒）spring.redis.timeout=5000
3.springboot启动类，增加Mybatis扫描注解
@MapperScan("com.lianjinsoft.mapper")@SpringBootApplicationpublic class RedisApplication { public static void main(String[] args) { SpringApplication.run(RedisApplication.class, args); }}
4.增加pojo数据表映射类
public class Order { private Integer id; private String orderNo; private String orderName; private BigDecimal amount; private Date addTime; //省略get、set}
5.增加Mapper数据持久层操作方法
public interface OrderMapper { void addOrder(Order order); void delOrder(String orderNo); void updOrder(Order order); Order queryOrderByNo(String orderNo);}
6.增加Mybatis主配置文件
7.增加Mapper对应的配置文件及sql
id, order_no, order_name, amount, add_time INSERT INTO orders (order_no,order_name,amount,add_time) VALUES (#{orderNo}, #{orderName}, #{amount}, #{addTime}) DELETE FROM orders WHERE order_no =#{orderNo} UPDATE orders SET order_name=#{orderName} WHERE id=#{id}
8.添加缓存配置（启用缓存）
@Configuration@EnableCachingpublic class RedisConfig extends CachingConfigurerSupport { @Bean public KeyGenerator keyGenerator() { return new KeyGenerator() { @Override public Object generate(Object target, Method method, Object... params) { StringBuilder sf = new StringBuilder(); sf.append(target.getClass().getName()); sf.append("_"); sf.append(method.getName()); for (Object obj : params) { sf.append("_"); sf.append(obj.toString()); } return sf.toString(); } }; } @Bean public CacheManager cacheManager(RedisTemplate redisTemplate) { return new RedisCacheManager(redisTemplate); } @Bean public RedisTemplate redisTemplate(RedisConnectionFactory factory) { StringRedisTemplate template = new StringRedisTemplate(factory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); ObjectMapper om = new ObjectMapper(); om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL); jackson2JsonRedisSerializer.setObjectMapper(om); template.setValueSerializer(jackson2JsonRedisSerializer); template.afterPropertiesSet(); return template; }}
9.增加OrderService接口及实现类
public interface OrderService { void addOrder(Order order); void delOrder(String orderNo); void updOrder(Order order); Order queryOrderByNo(String orderNo);} @Servicepublic class OrderServiceImpl implements OrderService{ private final String prefix = "order:"; @Autowired private OrderMapper orderMapper; @Autowired private RedisTemplate redisTemplate; @Override public void addOrder(Order order) { orderMapper.addOrder(order); redisTemplate.opsForValue().set(prefix+order.getOrderNo(), order); LogUtil.info("新增订单，添加缓存："+order); } @Override public void delOrder(String orderNo) { if(redisTemplate.hasKey(prefix+orderNo)){ redisTemplate.delete(prefix+orderNo); LogUtil.info("删除缓存数据："+orderNo); } orderMapper.delOrder(orderNo); } @Override public void updOrder(Order order) { orderMapper.updOrder(order); if(redisTemplate.hasKey(prefix+order.getOrderNo())){ redisTemplate.opsForValue().set(prefix+order.getOrderNo(), order); LogUtil.info("更新缓存订单信息："+order); } } @Override public Order queryOrderByNo(String orderNo) { Order order = (Order)redisTemplate.opsForValue().get(prefix+orderNo); if(order != null){ LogUtil.info("从缓存获取到数据："+order); return order; } order = orderMapper.queryOrderByNo(orderNo); if(order != null){ redisTemplate.opsForValue().set(prefix+orderNo, order); } return order; }}
10.增加OrderServiceTests测试类（Junit）
@RunWith(SpringRunner.class)@SpringBootTestpublic class OrderServiceTests { @Autowired private OrderService orderService; @Test public void test1_add() { //添加订单 orderService.addOrder(new Order("100001", "XX手机", new BigDecimal("4999"))); } @Test public void test2_query() { //查询订单 orderService.queryOrderByNo("100001"); } @Test public void test3_update() { //先查询订单信息 Order order = orderService.queryOrderByNo("100001"); order.setOrderName("国民手机"); //更新DB及缓存 orderService.updOrder(order); //再次查询 orderService.queryOrderByNo("100001"); } @Test public void test4_del() { //删除DB及缓存 orderService.delOrder("100001"); //再次查询 orderService.queryOrderByNo("100001"); }}
10.1）执行test1_add()方法
10:57:45.873 [main] INFO c.l.service.OrderServiceTests - Starting OrderServiceTests on LAPTOP-1DF7S904 with PID 8316 (started by lianjinsoft in E:\workspace\springboot\spring-boot-redis)10:57:45.875 [main] INFO c.l.service.OrderServiceTests - No active profile set, falling back to default profiles: default10:57:45.908 [main] INFO o.s.c.a.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:57:45 CST 2018]; root of context hierarchy10:57:46.233 [main] INFO o.s.d.r.c.RepositoryConfigurationDelegate - Multiple Spring Data modules found, entering strict repository configuration mode!10:57:47.370 [main] WARN o.s.b.s.r.RedisStarterDeprecationWarningAutoConfiguration - spring-boot-starter-redis is deprecated as of Spring Boot 1.4, please migrate to spring-boot-starter-data-redis10:57:47.399 [main] INFO c.l.service.OrderServiceTests - Started OrderServiceTests in 1.752 seconds (JVM running for 2.512)10:57:47.931 [main] INFO com.lianjinsoft.util.LogUtil - 新增订单，添加缓存：Order [id=null, orderNo=100001, orderName=XX手机, amount=4999, addTime=Mon Apr 23 10:57:47 CST 2018]10:57:47.939 [Thread-2] INFO o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:57:45 CST 2018]; root of context hierarchy
从日志的第7行可以看出，订单信息已经添加成功。并添加到缓存中。
10.2）执行test2_query()方法
10:58:04.273 [main] INFO c.l.service.OrderServiceTests - Starting OrderServiceTests on LAPTOP-1DF7S904 with PID 20492 (started by lianjinsoft in E:\workspace\springboot\spring-boot-redis)10:58:04.277 [main] INFO c.l.service.OrderServiceTests - No active profile set, falling back to default profiles: default10:58:04.301 [main] INFO o.s.c.a.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:58:04 CST 2018]; root of context hierarchy10:58:04.618 [main] INFO o.s.d.r.c.RepositoryConfigurationDelegate - Multiple Spring Data modules found, entering strict repository configuration mode!10:58:05.920 [main] WARN o.s.b.s.r.RedisStarterDeprecationWarningAutoConfiguration - spring-boot-starter-redis is deprecated as of Spring Boot 1.4, please migrate to spring-boot-starter-data-redis10:58:05.953 [main] INFO c.l.service.OrderServiceTests - Started OrderServiceTests in 1.903 seconds (JVM running for 2.659)10:58:06.101 [main] INFO com.lianjinsoft.util.LogUtil - 从缓存获取数据：Order [id=null, orderNo=100001, orderName=XX手机, amount=4999, addTime=Mon Apr 23 10:57:47 CST 2018]10:58:06.109 [Thread-2] INFO o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:58:04 CST 2018]; root of context hierarchy
从日志的第7行可以看出，查询信息从缓存中获取（没有查询数据库）。
10.3）执行test3_update()方法
10:58:17.172 [main] INFO c.l.service.OrderServiceTests - Starting OrderServiceTests on LAPTOP-1DF7S904 with PID 12316 (started by lianjinsoft in E:\workspace\springboot\spring-boot-redis)10:58:17.172 [main] INFO c.l.service.OrderServiceTests - No active profile set, falling back to default profiles: default10:58:17.207 [main] INFO o.s.c.a.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:58:17 CST 2018]; root of context hierarchy10:58:17.530 [main] INFO o.s.d.r.c.RepositoryConfigurationDelegate - Multiple Spring Data modules found, entering strict repository configuration mode!10:58:18.679 [main] WARN o.s.b.s.r.RedisStarterDeprecationWarningAutoConfiguration - spring-boot-starter-redis is deprecated as of Spring Boot 1.4, please migrate to spring-boot-starter-data-redis10:58:18.750 [main] INFO c.l.service.OrderServiceTests - Started OrderServiceTests in 1.809 seconds (JVM running for 2.553)10:58:19.032 [main] INFO com.lianjinsoft.util.LogUtil - 从缓存获取数据：Order [id=null, orderNo=100001, orderName=XX手机, amount=4999, addTime=Mon Apr 23 10:57:47 CST 2018]10:58:19.450 [main] INFO com.lianjinsoft.util.LogUtil - 更新缓存订单信息：Order [id=null, orderNo=100001, orderName=国民手机, amount=4999, addTime=Mon Apr 23 10:57:47 CST 2018]10:58:19.454 [main] INFO com.lianjinsoft.util.LogUtil - 从缓存获取数据：Order [id=null, orderNo=100001, orderName=国民手机, amount=4999, addTime=Mon Apr 23 10:57:47 CST 2018]10:58:19.458 [Thread-2] INFO o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:58:17 CST 2018]; root of context hierarchy
从日志的第7~9行可以看出，订单先从缓存中获取，然后执行了更新DB、更新缓存，最后再从缓存中获取到了订单信息。
10.4）执行test4_del()方法
10:58:34.652 [main] INFO c.l.service.OrderServiceTests - Starting OrderServiceTests on LAPTOP-1DF7S904 with PID 7428 (started by lianjinsoft in E:\workspace\springboot\spring-boot-redis)10:58:34.652 [main] INFO c.l.service.OrderServiceTests - No active profile set, falling back to default profiles: default10:58:34.676 [main] INFO o.s.c.a.AnnotationConfigApplicationContext - Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:58:34 CST 2018]; root of context hierarchy10:58:34.997 [main] INFO o.s.d.r.c.RepositoryConfigurationDelegate - Multiple Spring Data modules found, entering strict repository configuration mode!10:58:36.107 [main] WARN o.s.b.s.r.RedisStarterDeprecationWarningAutoConfiguration - spring-boot-starter-redis is deprecated as of Spring Boot 1.4, please migrate to spring-boot-starter-data-redis10:58:36.140 [main] INFO c.l.service.OrderServiceTests - Started OrderServiceTests in 1.856 seconds (JVM running for 2.61)10:58:36.281 [main] INFO com.lianjinsoft.util.LogUtil - 删除缓存数据：10000110:58:36.689 [main] INFO com.lianjinsoft.util.LogUtil - 从数据库获取数据：null10:58:36.693 [Thread-2] INFO o.s.c.a.AnnotationConfigApplicationContext - Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@306cf3ea: startup date [Mon Apr 23 10:58:34 CST 2018]; root of context hierarchy
从日志的第7、8行可以看出，订单信息已经从DB、缓存中删除了。
注意：
本案例只是简单的介绍如何将DB与缓存数据同步操作，并不一定适合您当前的业务需求。并且以上操作不能保证缓存与DB数据完全一致。
二、springboot集成redis并实现分布式session缓存
分布式session共享有很多方案，其中缓存托管就是主流一种实现。
1.添加session缓存相关依赖（pom.xml）
org.springframework.session spring-session-data-redis
2.添加session配置（启用session缓存）
maxInactiveIntervalInSeconds: 设置session失效时间。
@Configuration@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 60*30)public class SessionConfig {}
3.测试
3.1）修改本地服务端口并启动，模拟分布式应用部署（application.properties）
#服务端口（8001、8002、8003）server.port=8001
3.2）分别调用各应用接口，查看sessionId
3.3）查看redis缓存信息
如图：缓存中的sessionId与接口返回信息一致。
源代码：https://gitee.com/skychenjiajun/spring-boot