Redis 配置连接池，redisTemplate 操作多个db数据库，切换多个db，解决JedisConnectionFactory的设置连接方法过时问题。

傷城~ 2021-11-16 23:22 696阅读 0赞

## 环境 ##

1.  springmvc
2.  jdk1.8
3.  maven

## redis.properties配置文件 ##

#redis setting  
    redis.host=localhost
    redis.port=6379
    redis.password=
    redis.maxIdle=200
    redis.minIdle=0
    redis.maxActive=50
    redis.maxWait=10000
    redis.testOnBorrow=true
    redis.timeout=100000
    
    #定义需要使用的db
    //#sessionCode DB
    sessionCodeDb = 0
    //#车辆基本信息 DB
    bicycleInfoDb = 15
    //#当前位置信息 DB
    currentLocationDb = 14
    //#锁车/解锁 DB
    lockDb = 13
    //#根据车牌获取电子车牌 DB
    ebikeNoDb = 12
    //#根据电子车牌获取车牌 DB
    bikeNoDb = 11

## pom.xml依赖 ##

<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<spring.version>5.1.2.RELEASE</spring.version>
    	</properties>
    	
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-context</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-context-support</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-core</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-web</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>spring-webmvc</artifactId>
    			<version>${spring.version}</version>
    		</dependency>
    		
    
    		<dependency>
    			<groupId>redis.clients</groupId>
    			<artifactId>jedis</artifactId>
    			<version>2.9.3</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.springframework.data</groupId>
    			<artifactId>spring-data-redis</artifactId>
    			<version>2.0.14.RELEASE</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>fastjson</artifactId>
    			<version>1.2.11</version>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>net.sf.json-lib</groupId>
    			<artifactId>json-lib</artifactId>
    			<version>2.4</version>
    			<classifier>jdk15</classifier>
    		</dependency>

## RedisConfig.java 配置类 初始化redis连接池 ##

import com.fasterxml.jackson.annotation.JsonAutoDetect;
    import com.fasterxml.jackson.annotation.PropertyAccessor;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.connection.RedisPassword;
    import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
    import org.springframework.data.redis.connection.jedis.JedisClientConfiguration;
    import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.core.ValueOperations;
    import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
    import org.springframework.data.redis.serializer.RedisSerializer;
    import org.springframework.data.redis.serializer.StringRedisSerializer;
    import org.springframework.stereotype.Component;
    import redis.clients.jedis.JedisPoolConfig;
    
    import javax.annotation.PostConstruct;
    import java.io.Serializable;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.concurrent.TimeUnit;
    
    @Component
    @Slf4j
    public class RedisConfig { 
    
        @Value("${redis.host}")
        private String hostName;
        @Value("${redis.port}")
        private int port;
        @Value("${redis.password}")
        private String passWord;
        @Value("${redis.maxIdle}")
        private int maxIdl;
        @Value("${redis.minIdle}")
        private int minIdl;
        @Value("${redis.timeout}")
        private int timeout;
    
        @Value("${sessionCodeDb}")
        private int sessionCodeDb;
        @Value("${bicycleInfoDb}")
        private int bicycleInfoDb;
        @Value("${currentLocationDb}")
        private int currentLocationDb;
        @Value("${lockDb}")
        private int lockDb;
        @Value("${ebikeNoDb}")
        private int ebikeNoDb;
        @Value("${bikeNoDb}")
        private int bikeNoDb;
    
        public static Map<Integer,RedisTemplate<Serializable, Object>> redisTemplateMap = new HashMap<>();
    
        @PostConstruct
        public void initRedisTemp() throws Exception{ 
            log.info("###### START 初始化 Redis 连接池 START ######");
            redisTemplateMap.put(sessionCodeDb,redisTemplateObject(sessionCodeDb));
            redisTemplateMap.put(bicycleInfoDb,redisTemplateObject(bicycleInfoDb));
            redisTemplateMap.put(currentLocationDb,redisTemplateObject(currentLocationDb));
            redisTemplateMap.put(lockDb,redisTemplateObject(lockDb));
            redisTemplateMap.put(ebikeNoDb,redisTemplateObject(ebikeNoDb));
            redisTemplateMap.put(bikeNoDb,redisTemplateObject(bikeNoDb));
            log.info("###### END 初始化 Redis 连接池 END ######");
        }
    
        public RedisTemplate<Serializable, Object> redisTemplateObject(Integer dbIndex) throws Exception { 
            RedisTemplate<Serializable, Object> redisTemplateObject = new RedisTemplate<Serializable, Object>();
            redisTemplateObject.setConnectionFactory(redisConnectionFactory(jedisPoolConfig(),dbIndex));
            setSerializer(redisTemplateObject);
            redisTemplateObject.afterPropertiesSet();
            return redisTemplateObject;
        }
    
        /** * 连接池配置信息 * @return */
        public JedisPoolConfig jedisPoolConfig() { 
            JedisPoolConfig poolConfig=new JedisPoolConfig();
            //最大连接数
            poolConfig.setMaxIdle(maxIdl);
            //最小空闲连接数
            poolConfig.setMinIdle(minIdl);
            poolConfig.setTestOnBorrow(true);
            poolConfig.setTestOnReturn(true);
            poolConfig.setTestWhileIdle(true);
            poolConfig.setNumTestsPerEvictionRun(10);
            poolConfig.setTimeBetweenEvictionRunsMillis(60000);
            //当池内没有可用的连接时，最大等待时间
            poolConfig.setMaxWaitMillis(10000);
            //------其他属性根据需要自行添加-------------
            return poolConfig;
        }
        /** * jedis连接工厂 * @param jedisPoolConfig * @return */
        public RedisConnectionFactory redisConnectionFactory(JedisPoolConfig jedisPoolConfig,int db) { 
            //单机版jedis
            RedisStandaloneConfiguration redisStandaloneConfiguration =
                    new RedisStandaloneConfiguration();
            //设置redis服务器的host或者ip地址
            redisStandaloneConfiguration.setHostName(hostName);
            //设置默认使用的数据库
            redisStandaloneConfiguration.setDatabase(db);
            //设置密码
            redisStandaloneConfiguration.setPassword(RedisPassword.of(passWord));
            //设置redis的服务的端口号
            redisStandaloneConfiguration.setPort(port);
            //获得默认的连接池构造器(怎么设计的，为什么不抽象出单独类，供用户使用呢)
            JedisClientConfiguration.JedisPoolingClientConfigurationBuilder jpcb =
                    (JedisClientConfiguration.JedisPoolingClientConfigurationBuilder)JedisClientConfiguration.builder();
            //指定jedisPoolConifig来修改默认的连接池构造器（真麻烦，滥用设计模式！）
            jpcb.poolConfig(jedisPoolConfig);
            //通过构造器来构造jedis客户端配置
            JedisClientConfiguration jedisClientConfiguration = jpcb.build();
            //单机配置 + 客户端配置 = jedis连接工厂
            return new JedisConnectionFactory(redisStandaloneConfiguration, jedisClientConfiguration);
        }
    
        private void setSerializer(RedisTemplate<Serializable, Object> template) { 
            Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(
                    Object.class);
            ObjectMapper om = new ObjectMapper();
            om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
            om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jackson2JsonRedisSerializer.setObjectMapper(om);
            template.setKeySerializer(template.getStringSerializer());
            template.setValueSerializer(jackson2JsonRedisSerializer);
            template.setHashValueSerializer(jackson2JsonRedisSerializer);
            //在使用String的数据结构的时候使用这个来更改序列化方式
            RedisSerializer<String> stringSerializer = new StringRedisSerializer();
            template.setKeySerializer(stringSerializer );
            template.setValueSerializer(stringSerializer );
            template.setHashKeySerializer(stringSerializer );
            template.setHashValueSerializer(stringSerializer );
        }
    
        /** * 删除对应的value * @param key */
        public void remove(final String key,int db) { 
            RedisTemplate<Serializable, Object> redisTemplate = getRedisTemplateByDb(db);
            if (exists(key,redisTemplate)) { 
                redisTemplate.delete(key);
            }
        }
    
        /** * 判断缓存中是否有对应的value * @param key * @return */
        public boolean exists(final String key,RedisTemplate<Serializable, Object> redisTemplate) { 
            return redisTemplate.hasKey(key);
        }
    
        /** * 读取缓存 * @param key * @return */
        public Object get(final String key,int db) { 
            RedisTemplate<Serializable, Object> redisTemplate = getRedisTemplateByDb(db);
            Object result = null;
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            result = operations.get(key);
            return result;
        }
    
        /** * 写入缓存 * @param key * @param value * @return */
        public boolean set(final String key, Object value,int db) { 
            RedisTemplate<Serializable, Object> redisTemplate = getRedisTemplateByDb(db);
            boolean result = false;
            try { 
                ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
                operations.set(key, value);
                result = true;
            } catch (Exception e) { 
                log.error("set cache error", e);
            }
            return result;
        }
    
        /** * 根据key 获取过期时间 * @param key 键 不能为null * @return 返回0代表为永久有效 */
        public long getExpire(String key,TimeUnit unit,int db) { 
            RedisTemplate<Serializable, Object> redisTemplate = getRedisTemplateByDb(db);
            return redisTemplate.getExpire(key, unit);
        }
    
    
     
    /** * 根据db 获取对应的redisTemplate实例 * @param db * @return */
        public RedisTemplate<Serializable, Object> getRedisTemplateByDb(int db){ 
            return redisTemplateMap.get(db);
        }
    
    }

## 在其他类中的使用 ##

@Autowired
    	private RedisConfig redisUtil;
    	
    	//#获取db0 数据库的数据
    	public static Integer sessionCodeDb = 0;
    /** * 根据sessionCode获取userId * @param sessionCode * @return */
    	public String getUserIdBySessionCode(String sessionCode){ 
    		try { 
    			Object obj = redisUtil.get(sessionCode,sessionCodeDb);
    			if(obj!=null) { 
    				return obj.toString();
    			}else{ 
    				return null;
    			}
    		}catch (Exception e){ 
    			e.printStackTrace();
    			return null;
    		}
    	}