Springboot2.X中怎么切換redis庫

Springboot2.X中怎么切換redis庫，很多新手對此不是很清楚，為了幫助大家解決這個難題，下面小編將為大家詳細(xì)講解，有這方面需求的人可以來學(xué)習(xí)下，希望你能有所收獲。

1、application.properties

#redis
spring.redis.database=0
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=
spring.redis.timeout=10000ms

spring.redis.jedis.pool.max-active=8
spring.redis.jedis.pool.max-wait=-1ms
spring.redis.jedis.pool.min-idle=0
spring.redis.jedis.pool.max-idle=8

2、pom文件

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.9.0</version>
</dependency>
<dependency>
    <groupId>commons-lang</groupId>
    <artifactId>commons-lang</artifactId>
    <version>2.5</version>
</dependency>
<dependency>
    <groupId>com.google.collections</groupId>
    <artifactId>google-collections</artifactId>
    <version>1.0</version>
</dependency>

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

3、配置類

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

/**
 * @Author:MuJiuTian
 * @Description:redis的配置，這里默認(rèn)設(shè)置使用redis：0 數(shù)據(jù)庫
 * @Date: Created in 下午11:27 2019/7/4
 */
@Configuration
@EnableCaching
public class RedisCacheConfiguration extends CachingConfigurerSupport {

    @Value("${spring.redis.host}")
    private String host;

    @Value("${spring.redis.port}")
    private int port;

    @Value("${spring.redis.timeout}")
    private String timeout;

    @Value("${spring.redis.jedis.pool.max-idle}")
    private int maxIdle;

    @Value("${spring.redis.jedis.pool.max-wait}")
    private String maxWaitMillis;

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

    @Bean
    public JedisPool redisPoolFactory() {
        JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
        jedisPoolConfig.setMaxIdle(maxIdle);
        jedisPoolConfig.setMaxWaitMillis(Long.valueOf(maxWaitMillis.substring(0,maxWaitMillis.length()-2)));
        JedisPool jedisPool = new JedisPool(jedisPoolConfig, host, port,Integer.valueOf(timeout.substring(0,timeout.length()-2)));
        return jedisPool;
    }
}

4、redis工具類

import java.util.List;
import java.util.Map;

public interface RedisService {
    
    String setex(String key, int seconds,String value,int index);

    String set(String key, String value,int index);

    String get(String key,int index);
}

5、redis具體實現(xiàn)類

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

@Component
public class CacheSingleService implements RedisService{

    @Autowired
    private JedisPool jedisPool;

    public void returnResource(Jedis jedis) {
        jedis.close();
    }

    public Jedis getResource(int index) {
        Jedis jedis = jedisPool.getResource();
        jedis.select(index);
        return jedis;
    }

    public String setex(String key, int seconds, String value,int index) {
        Jedis jedis = null;
        try {
            jedis = getResource(index);
            return jedis.setex(key, seconds, value);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            returnResource(jedis);
        }
        return null;
    }

    public String set(String key, String value,int index){
        Jedis jedis = null;
        try {
            jedis = getResource(index);
            return jedis.set(key, value);
        } finally {
            returnResource(jedis);
        }
    }
    public String get(String key,int index) {
        String value = null;
        Jedis jedis = null;
        try {
            jedis = getResource(index);
            value = jedis.get(key);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            returnResource(jedis);
        }
        return value;
    }
}

6、枚舉類

/**
 * @Author:MuJiuTian
 * @Description:通過枚舉類選擇redis使用的數(shù)據(jù)庫，一般公司的redis會分不同的數(shù)據(jù)到不同的庫，比如用戶信息到0庫
 * 商品數(shù)據(jù)放在第二個庫，運(yùn)動數(shù)據(jù)放在第三庫等等跟隨項目分配而分配
 * @Date: Created in 下午10:13 2019/7/29
 */
public enum RedisPartition {
    //以下分別代表redis 0-15庫
    INFO(0),
    One(1),
    Two(2),
    THREE(3),
    FOUR(4),
    FIVE(5),
    SIX(6),
    SEVEN(7),
    EIGHT(8),
    NINE(9),
    TEN(10),
    ELEVEN(11),
    TWELVE(12),
    THIRTEEN(13),
    FOURTEEN(14),
    FIFTEEN(15);

    private int ordinal;
    //構(gòu)造方法
    RedisPartition(int ordinal) {
        this.ordinal = ordinal;
    }

    public void setOrdinal(int dbNum) {
        this.ordinal = dbNum;
    }

    public int getOrdinal() {
        return ordinal;
    }

    @Override
    public String toString() {
        return ""+ordinal;
    }
}

7、Controller層

import lombok.extern.slf4j.Slf4j;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;

@RestController
@Slf4j
public class TestController {
    @Autowired
    CacheSingleService singleService;

    @GetMapping("/test3")
    public String test3() {
        String key = "osc";
        String str = "i love osc";
        //存放在5數(shù)據(jù)庫，默認(rèn)是0
        singleService.set(key,"iloveyou",RedisPartition.SIX.getOrdinal());
        //存放在4數(shù)據(jù)庫，默認(rèn)是0
        singleService.set(str+"ii","iloveyou",RedisPartition.FIVE.getOrdinal());
        return "SUCCESS";
    }

    @GetMapping(value = "/test4")
    public String test4(){

        String key = "osc";
        String str = "i love osc";

        //查詢5數(shù)據(jù)庫內(nèi)容
        String str1 = singleService.get(key,RedisPartition.SIX.getOrdinal());

        //查詢4數(shù)據(jù)庫內(nèi)容
        String str2 = singleService.get(str,RedisPartition.FIVE.getOrdinal());

        return str1+str2;
    }

    public static void main(String[] args) {
        System.out.println(RedisPartition.FIFTEEN.getOrdinal());
    }
}

8、測試結(jié)果

    使用Redis自帶方法同時使用16個數(shù)據(jù)庫，繼續(xù)使用上面的pom文件依賴

9、Redis工具類

切記：接下來這個適用于Springboot2.1.X的版本，包括2.0.X，2.2.X的版本目前通過以下不能實現(xiàn)數(shù)據(jù)庫的切換。

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

@Component
public class RedisUtil {

    @Autowired
    private StringRedisTemplate redisTemplate;

    public void setRedisTemplate(StringRedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    public void setDataBase(int num) {
        LettuceConnectionFactory connectionFactory = (LettuceConnectionFactory) redisTemplate.getConnectionFactory();
        if (connectionFactory != null && num != connectionFactory.getDatabase()) {
            connectionFactory.setDatabase(num);
            this.redisTemplate.setConnectionFactory(connectionFactory);
            connectionFactory.resetConnection();
        }
    }

    public StringRedisTemplate getRedisTemplate() {
        return this.redisTemplate;
    }

    public void set(String key, String value) {
        redisTemplate.opsForValue().set(key, value);
    }

    //獲取指定key的值
    public String get(String key) {
        return redisTemplate.opsForValue().get(key);
    }
}

10、Controller測試

@Autowired
RedisUtil redisUtil;

@GetMapping("/test")
public String test(String key) {
    for (int i = 1; i < 3; i++) {
        redisUtil.setDataBase(i);
        redisUtil.set(key, "" + i + key);
    }
    //開發(fā)環(huán)境用下面的代碼，上面純簡單測試去不同的redis數(shù)據(jù)庫而已
    //redisUtil.setDataBase(RedisPartition.EIGHT.getOrdinal());
    
    return redisUtil.get(key);
}

11、總結(jié)

      兩種方式j(luò)edis和StringRedisTemplate切換數(shù)據(jù)庫，我更喜歡用jedis，使用SringRedisTemplate我就沒有過多的把所有redis方法復(fù)制出來。

12、附加

    下面的是ssm框架切換同時使用redis數(shù)據(jù)庫的配置，至于redis.xml和redis.properties從網(wǎng)上copy一下吧

@Resource(name="stringRedisTemplate")
   private StringRedisTemplate stringRedisTemplate;

private StringRedisTemplate choseConnection(RedisConnectionEnum redisEnum){
   JedisConnectionFactory factory = (JedisConnectionFactory) stringRedisTemplate.getConnectionFactory();
   factory.setDatabase(redisEnum.getDbNum());
   stringRedisTemplate.setConnectionFactory(factory);
   return stringRedisTemplate;
   }

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