SpringBoot2.0 base case (08): Redis database integration, to achieve cache management

A, Redis Introduction

Spring Boot in addition to providing excellent automated support for common relational database outside, as for many NoSQL database provides support for automated configuration, including: Redis, MongoDB, Elasticsearch. These cases collated, will continue to upload Git.

SpringBoot2 version, supported by more and more rich components, support for Redis not only extends the API, it is dependent on the underlying replace the Jedis, and replaced with Lettuce.
This case requires a local installation of a Redis database.

Two, Spring2.0 integrated Redis

1, dependent on the core

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

2, the configuration file

# 端口
server:
  port: 8008
spring:
  application:
    # 应用名称
    name: node08-boot-redis
  # redis 配置
  redis:
    host: 127.0.0.1
    #超时连接
    timeout: 1000ms
    jedis:
      pool:
        #最大连接数据库连接数,设 0 为没有限制
        max-active: 8
        #最大等待连接中的数量,设 0 为没有限制
        max-idle: 8
        #最大建立连接等待时间。如果超过此时间将接到异常。设为-1表示无限制。
        max-wait: -1ms
        #最小等待连接中的数量,设 0 为没有限制
        min-idle: 0

Redis such an environment it is configured, it can already be used directly packaged the API.

3, a simple test case

import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.concurrent.TimeUnit;
@RestController
public class RedisController {
    @Resource
    private StringRedisTemplate stringRedisTemplate ;
    @RequestMapping("/setGet")
    public String setGet (){
        stringRedisTemplate.opsForValue().set("cicada","smile");
        return stringRedisTemplate.opsForValue().get("cicada") ;
    }
    @Resource
    private RedisTemplate redisTemplate ;
    /**
     * 设置 Key 的有效期 10 秒
     */
    @RequestMapping("/setKeyTime")
    public String setKeyTime (){
        redisTemplate.opsForValue().set("timeKey","timeValue",10, TimeUnit.SECONDS);
        return "success" ;
    }
    @RequestMapping("/getTimeKey")
    public String getTimeKey (){
        // 这里 Key 过期后，返回的是字符串 'null'
        return String.valueOf(redisTemplate.opsForValue().get("timeKey")) ;
    }
}

4, custom serialization configuration

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import java.io.Serializable;
/**
 * Redis 配置
 */
@Configuration
public class RedisConfig {
    private static final Logger LOGGER = LoggerFactory.getLogger(RedisConfig.class) ;
    /**
     * 序列化配置
     */
    @Bean
    public RedisTemplate<String, Serializable> redisTemplate
            (LettuceConnectionFactory  redisConnectionFactory) {
        LOGGER.info("RedisConfig == >> redisTemplate ");
        RedisTemplate<String, Serializable> template = new RedisTemplate<>();
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }
}

5, the sequence of the test

import com.boot.redis.entity.User;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;
@RestController
public class SerializeController {
    @Resource
    private RedisTemplate redisTemplate ;
    @RequestMapping("/setUser")
    public String setUser (){
        User user = new User() ;
        user.setName("cicada");
        user.setAge(22);
        List<String> list = new ArrayList<>() ;
        list.add("小学");
        list.add("初中");
        list.add("高中");
        list.add("大学");
        user.setEducation(list);
        redisTemplate.opsForValue().set("userInfo",user);
        return "success" ;
    }
    @RequestMapping("/getUser")
    public User getUser (){
        return (User)redisTemplate.opsForValue().get("userInfo") ;
    }
}

Third, the source address

GitHub地址：知了一笑
https://github.com/cicadasmile
码云地址：知了一笑
https://gitee.com/cicadasmile