SpringBoot集成redis简要

本文为redis服务的独立部署，内置到应用服务中同理，仅需要2、3、4三步（根据情况添加）

大致步骤：

1. 安装redis
2. 配置yml和添加pom
3. 添加config配置类
4. 添加redis数据的get、set类

详细步骤：

1、redis的安装

本人很懒，不想写安装，请移步其他道友：

https://www.cnblogs.com/wmy666/p/15148686.html

https://www.runoob.com/redis/redis-install.html

2、新建module作为redis的服务

​ application主类不想改可以不动

• 配置yml：

  spring:
  	#应用名称
      application:
          name: redis-server
      redis:
      	#redis 数据库的数量
          database: 0
          #redis端口地址默认是6379（如果没有改redis软件的配置文件的话）
          host: 127.0.0.1
          port: 6379
          password:
          jedis:
              pool:
              	#最大连接数，设置为0则无限制
                  max-active: 8
                  #最大等待毫秒数, 单位为 ms, 超过时间会出错误信息
                  max-wait: 1
                  #空闲连接数，没有数据库的连接时依然可以保持连接不清除的个数
                  max-idle: 9
                  min-idle: 0
          #单位秒，默认为0（永不断开），在timeout时间之后一直没有连接的话断开连接
          timeout: 0
  #服务端口
  server:
      port: 8911
  
  #注册中心地址
  eureka:
      client:
          service-url:
              defaultZone: http://localhost:8900/eureka/
  

• 更改pom

    <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter</artifactId>
          </dependency>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
          <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
              <version>3.1.0</version>
          </dependency>
          <!--    redis  除了这个其他都是独立部署需要的  -->
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-data-redis</artifactId>
          </dependency>
      </dependencies>
  
      <dependencyManagement>
          <dependencies>
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-dependencies</artifactId>
                  <version>2021.0.0</version>
                  <type>pom</type>
                  <scope>import</scope>
              </dependency>
          </dependencies>
      </dependencyManagement>
  

3、添加config配置类

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.cache.CacheProperties;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Configuration;


import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
    @Autowired
    CacheProperties cacheProperties;

    @Bean
    public RedisCacheConfiguration redisCacheConfiguration() {
        RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig();
        configuration = configuration.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jsonSerializer()));
        return configuration;
    }


    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        template.setValueSerializer(jsonSerializer());
        //使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.afterPropertiesSet();
        return template;
    }

    /**
    	使用Jackson2JsonRedisSerializer来序列化和反序列化redis的value值
    	否则，使用put(Object, Object)存入redis时，
    	redis中的key会变成类似于\xac\xed\x00\x05t\x00\x1IAMAKEY的结构
    **/
    private Jackson2JsonRedisSerializer jsonSerializer() {
        Jackson2JsonRedisSerializer serializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false);
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        mapper.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.WRAPPER_ARRAY);
        serializer.setObjectMapper(mapper);
        return serializer;
    }
}

4、缓存的get、set

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class RedisService {

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Resource(name="stringRedisTemplate")
    ValueOperations<String, String> valueOptStr;

    @Autowired
    RedisTemplate<Object, Object> redisTemplate;

    @Resource(name = "redisTemplate")
    ValueOperations<Object, Object> valueOptObj;

    /**
     * 根据key获取String
     * @param key
     * @return
     */
    public String getStr(String key){
        return valueOptStr.get(key);
    }

    public void setStr(String key, String val){
        valueOptStr.set(key, val);
    }

    public void del(String key){
        stringRedisTemplate.delete(key);
    }


    /**
     * Object 设置缓存
     * @param key
     * @return
     */
    public Object getObj(Object key){
        return valueOptObj.get(key);
    }

    public void setObj(Object key, Object val){
        valueOptObj.set(key, val);
    }

    public void del(Object key){
        redisTemplate.delete(key);
    }
}

调用示例：

1、集成在工程服务中的调用

@Autowired
RedisService redisService;

public String getName(String key){
    return redisService.getStr(key);
}

2、redis独立部署的调用

需要有一个controller类接收外部请求，并在调用服务那一方（消费者）添加feignclient

详见：SpringBoot集成SpringCloud简要 详细步骤 3