spring-boot 速成(12) - 如何注入多个redis StringRedisTemplate

默认情况下，spring-boot的redis自动配置，只能注册一个StringRedisTemplate实例，如果希望注入多个，比如：1个读写database 0，1个读写database 1 ... ，默认的自动配置就不行了，可以参考下面的做法：

一、创建多实例配置类

 package cn.mwee.order.cloud.admin.common.config;

 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
 import org.springframework.data.redis.connection.RedisConnectionFactory;
 import org.springframework.data.redis.connection.RedisSentinelConfiguration;
 import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.data.redis.serializer.StringRedisSerializer;
 import redis.clients.jedis.JedisPoolConfig;

 import java.util.HashSet;
 import java.util.Set;

 /**
  * Created by 菩提树下的杨过(http://yjmyzz.cnblogs.com/) on 19/09/2017.
  */
 @Configuration
 public class RedisConfig {

     @Value("${redis.sentinel.group}")
     protected String sentinelGroupName;

     @Value("${redis.sentinel.nodes}")
     protected String sentinelNodes;

     @Value("${redis.maxTotal}")
     protected int maxTotal;

     @Value("${redis.minIdle}")
     protected int minIdle;

     @Value("${redis.maxIdle}")
     protected int maxIdle;

     @Value("${redis.maxWaitMillis}")
     protected long maxWaitMillis;

     @Value("${redis.testOnBorrow}")
     protected boolean testOnBorrow;

     @Value("${redis.testOnReturn}")
     protected boolean testOnReturn;

     @Value("${redis.password}")
     protected String password;

     @Value("${redis.timeout}")
     protected int timeout;

     @Bean
     public RedisSentinelConfiguration redisSentinelConfiguration() {
         String[] nodes = sentinelNodes.split(",");
         Set<String> setNodes = new HashSet<>();
         for (String n : nodes) {
             setNodes.add(n.trim());
         }
         RedisSentinelConfiguration configuration = new RedisSentinelConfiguration(sentinelGroupName, setNodes);
         return configuration;
     }

     @Bean
     public JedisPoolConfig jedisPoolConfig() {
         JedisPoolConfig poolConfig = new JedisPoolConfig();
         poolConfig.setMaxTotal(maxTotal);
         poolConfig.setMinIdle(minIdle);
         poolConfig.setMaxIdle(maxIdle);
         poolConfig.setMaxWaitMillis(maxWaitMillis);
         poolConfig.setTestOnBorrow(testOnBorrow);
         poolConfig.setTestOnReturn(testOnReturn);
         return poolConfig;
     }

     @Bean
     public StringRedisSerializer stringRedisSerializer() {
         return new StringRedisSerializer();
     }

     @Bean(name = "redisTemplate00")
     @Primary
     public StringRedisTemplate redisTemplate00() {
         return buildRedisTemplate(buildConnectionFactory(0));
     }

     @Bean(name = "redisTemplate01")
     public StringRedisTemplate redisTemplate01() {
         return buildRedisTemplate(buildConnectionFactory(1));
     }

     @Bean(name = "redisTemplate02")
     public StringRedisTemplate redisTemplate02() {
         return buildRedisTemplate(buildConnectionFactory(2));
     }

     @Bean(name = "redisTemplate03")
     public StringRedisTemplate redisTemplate03() {
         return buildRedisTemplate(buildConnectionFactory(3));
     }

     @Bean(name = "redisTemplate04")
     public StringRedisTemplate redisTemplate04() {
         return buildRedisTemplate(buildConnectionFactory(4));
     }

     private JedisConnectionFactory buildConnectionFactory(int database) {
         JedisConnectionFactory connectionFactory = new JedisConnectionFactory(redisSentinelConfiguration(), jedisPoolConfig());
         connectionFactory.setUsePool(true);
         connectionFactory.setTimeout(timeout);
         connectionFactory.setDatabase(database);
         connectionFactory.setPassword(password);
         connectionFactory.afterPropertiesSet();
         return connectionFactory;
     }

     protected StringRedisTemplate buildRedisTemplate(RedisConnectionFactory connectionFactory) {
         StringRedisTemplate template = new StringRedisTemplate();
         template.setConnectionFactory(connectionFactory);
         template.setValueSerializer(stringRedisSerializer());
         template.afterPropertiesSet();
         return template;
     }

 }

上面的示例，注入了5个redisTemplate实例，分别对应redis的0到4，共5个database。

二、配置类application.yml

redis:
  sentinel:
    group: ${redis.sentinel.group}
    nodes: ${redis.sentinel.nodes}
  maxTotal: ${redis.maxTotal}
  minIdle: ${redis.minIdle}
  maxWaitMillis: ${redis.maxWait}
  testOnBorrow: ${redis.testOnBorrow}
  testOnReturn: ${redis.testOnReturn}
  password:
  timeout: ${redis.timeout}　　

　　大家把里面的占位符，换成具体值就可以了。