spring boot(九):Spring Boot中Redis的使用
Redis实战代码
1、引入 spring-boot-starter-redis
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-redis</artifactId> </dependency>
2、添加配置文件
# REDIS (RedisProperties)
# Redis数据库索引(默认为0)
spring.redis.database=0
# Redis服务器地址
spring.redis.host=192.168.0.58
# 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=
# 连接池最大连接数(使用负值表示没有限制)
spring.redis.pool.max-active=8
# 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=-1
# 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=0
# 连接超时时间(毫秒)
spring.redis.timeout=0
3、添加cache的配置类
package cn.cnki.ref.config; import java.lang.reflect.Method; import org.springframework.cache.CacheManager; import org.springframework.cache.annotation.CachingConfigurerSupport; import org.springframework.cache.annotation.EnableCaching; import org.springframework.cache.interceptor.KeyGenerator; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer; import com.fasterxml.jackson.annotation.JsonAutoDetect; import com.fasterxml.jackson.annotation.PropertyAccessor; import com.fasterxml.jackson.databind.ObjectMapper; @Configuration @EnableCaching public class MyRedisConfig extends CachingConfigurerSupport{ @Bean public KeyGenerator keyGenerator() { return new KeyGenerator() { @Override public Object generate(Object target, Method method, Object... params) { StringBuilder sb = new StringBuilder(); sb.append(target.getClass().getName()); sb.append(method.getName()); for (Object obj : params) { sb.append(obj.toString()); } return sb.toString(); } }; } @SuppressWarnings("rawtypes") @Bean public CacheManager cacheManager(RedisTemplate redisTemplate) { RedisCacheManager rcm = new RedisCacheManager(redisTemplate); //设置缓存过期时间 //rcm.setDefaultExpiration(60);//秒 return rcm; } @Bean public RedisTemplate<String, String> 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; } }
测试
package cn.cnki.ref.config; import cn.cnki.ref.pojo.User; import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.data.redis.core.ValueOperations; import org.springframework.test.context.junit4.SpringRunner; import java.util.concurrent.TimeUnit; import static org.junit.Assert.*; @RunWith(SpringRunner.class) @SpringBootTest public class MyRedisConfigTest { @Autowired private StringRedisTemplate stringRedisTemplate; @Autowired private RedisTemplate redisTemplate; @Test public void test() throws Exception { stringRedisTemplate.opsForValue().set("key", "mf"); //Assert.assertEquals("mf", stringRedisTemplate.opsForValue().get("key")); } @Test public void testObj() throws Exception { User user = new User(1, "mf", "沐风", 20, "15010298065", "123456@qq.com"); ValueOperations<String, User> operations = redisTemplate.opsForValue(); operations.set("user", user); operations.set("userkey", user, 30, TimeUnit.SECONDS);//30秒过期 boolean exists = redisTemplate.hasKey("user"); if (exists) { System.out.println("exists is true"); } else { System.out.println("exists is false"); } //redisTemplate.delete("user"); // Assert.assertEquals("mf", operations.get("user").getUserName()); } }
自动根据方法生成缓存
@GetMapping("/getUserRedis") @Cacheable(value="key-Users") public User getUserRedis() { User user = new User(1, "mf", "沐风", 20, "15010298065", "123456@qq.com"); System.out.println(user); return user; }
RedisTemplate的各种操作
RedisTemplate访问Redis数据结构(一)——String
RedisTemplate访问Redis数据结构(二)——List
RedisTemplate访问Redis数据结构(三)——Hash
RedisTemplate访问Redis数据结构(四)——Set
RedisTemplate访问Redis数据结构(五)——ZSet
关于RedisTemplate和StringRedisTemplate
RedisTemplate看这个类的名字后缀是Template,如果了解过Spring如何连接关系型数据库的,大概不会难猜出这个类是做什么的 ,它跟JdbcTemplate一样封装了对Redis的一些常用的操作,当然 StringRedisTemplate跟RedisTemplate功能类似那么肯定就会有人问,为什么会需要两个Template呢,一个不就够了吗?其实他们两者之间的区别主要在于他们使用的序列化类。
- RedisTemplate使用的是 JdkSerializationRedisSerializer
- StringRedisTemplate使用的是 StringRedisSerializer
Redis分布式锁
https://www.cnblogs.com/toutou/p/redis_lock.html
资料
https://blog.csdn.net/weixin_37490221/article/details/78134521