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This article is about how SpringBoot integrates Redis. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

SpringBoot Integration Redis1, Overview

What is Redis?

Redis (Remote Dictionary Server), the remote dictionary service.

Is an open source ANSI C language to write, support the network, memory-based and persistent log-type, Key-Value database, and provide multiple languages of API.

Like memcached, data is cached in memory for efficiency. The difference is that redis will periodically write updated data to disk or modify operations to additional record files, and on this basis to achieve master-slave (master-slave) synchronization.

What can Redis do?

Memory storage, persistence, memory is lost immediately after power outage, so need persistence (RDB, AOF) high efficiency, for caching publish and subscribe system map information analysis timer, counter (eg: pageviews). ...

Characteristics

Multiple data types

Persistence

Cluster

Business

...

2. Test Redis

SpringBoot operation data, Spring-Data, jbdc, redis... ...

SpringData is a project as famous as SpringBoot!

Note: after SpringBoot2.x, the original jedis was replaced with lettuce

Jedis: the use of direct connection, multi-thread operation, is not safe, if you want to avoid unsafe, you need to use jedis pool connection pool! Like BIO mode

Lettuce: with netty, instances can be shared among multiple threads, and there is no thread unsafe situation! Can reduce thread data, more like NIO mode

Create a new project

Note:

View the underlying layer

Source code analysis:

@ Bean@ConditionalOnMissingBean (/ / if the component condition is not injected, we can define a redisTemplate to replace the default name = {"redisTemplate"}) public RedisTemplate redisTemplate (RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {/ / default RedisTemplate does not have too many settings redis both need to be serialized! / / both generics are Object Object types, and we need to cast RedisTemplate template = new RedisTemplate (); template.setConnectionFactory (redisConnectionFactory) later Return template;} @ Bean@ConditionalOnMissingBean / / since String is the most commonly used type in redis, a beanned public StringRedisTemplate stringRedisTemplate (RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {StringRedisTemplate template = new StringRedisTemplate (); template.setConnectionFactory (redisConnectionFactory); return template;} is proposed separately.

1. Import dependency

2. Configure the connection

# SpringBoot all configuration classes have an automatic configuration class RedisAutoConfiguration# automatic configuration class is bound to a properties configuration file RedisProperties# configuration redisspring.redis.host=127.0.0.1spring.redis.port=6379spring.redis

3. Test!

Package com.kk;import org.junit.jupiter.api.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.data.redis.connection.RedisConnection;import org.springframework.data.redis.core.RedisTemplate;@SpringBootTestclass Redis01SpringbootApplicationTests {@ Autowired private RedisTemplate redisTemplate @ Test void contextLoads () {/ * redisTemplate opsForValue operation string similar to String opsForList operation List similar to List opsForSet opsForHash opsForZSet opsForGeo opsForHyperLogLog except for basic operations Our commonly used methods can get the connection object of redis / / RedisConnection connection = redisTemplate.getConnectionFactory () .getConnection () directly through redisTemplate, such as transaction and basic CRUD * / /. / / connection.flushDb (); / / connection.flushAll (); redisTemplate.opsForValue () .set ("kk1", "kk2"); System.out.println (redisTemplate.opsForValue () .get ("kk1"));}}

3. Custom redisTemplate

First, build an entity class and test

User class

Package com.kk.pojo;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import org.springframework.stereotype.Component;import java.io.Serializable;@Component@Data@AllArgsConstructor@NoArgsConstructor// in the enterprise, all of our pojo serialize public class User implements Serializable {private String name; private int age;}

Test:

@ Testpublic void test () throws JsonProcessingException {/ / Real developers generally use json to pass the object User user = new User ("kk", 17); String jsonUser = new ObjectMapper () .writeValueAsString (user); / / this becomes a json object redisTemplate.opsForValue (). Set ("user", jsonUser); System.out.println (redisTemplate.opsForValue (). Get ("user"));} r = new ObjectMapper (). WriteValueAsString (user) / / this becomes a json object redisTemplate.opsForValue () .set ("user", jsonUser); System.out.println (redisTemplate.opsForValue () .get ("user"));}

= Note: if serialization is not implemented in the User class, it will report an error = =

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