Spring Boot-整合redis(六)

redis安装

参考：https://www.cnblogs.com/LQBlog/p/9214517.html

单机版

1.添加pom依赖

<!-- Spring Boot Reids 依赖 -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>1.5.7.RELEASE</version>
        </dependency>

        <!--spring2.0集成redis所需common-pool2-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-pool2</artifactId>
            <version>2.4.2</version>
        </dependency>

2.application.properties配置redis连接信息

spring
    redis:
        host: 192.168.65.128
        port: 6379
        timeout: 0
        password: # 密码 没有则不填

3.添加测试代码

@Service
public class AddressServiceImpl extends BaseServiceImpl<Address> implements AddressService {
    @Resource
    AddressMapper addressMapper;

    @Autowired
    private RedisTemplate<Object,Object> redisTemplate;
    @Override
    public Address selectByPrimaryKey(Object key) {
        String redisKey=key.toString();
        Address address=(Address) redisTemplate.opsForValue().get(redisKey);
        if(address==null){
            //防止缓存穿透
            synchronized (this) {
                address = (Address) redisTemplate.opsForValue().get(redisKey);
                if (address == null) {
                    address = super.selectByPrimaryKey(key);
                    redisTemplate.opsForValue().set(redisKey, address);
                }
            }
        }else {
            System.out.println("使用缓存了");
        }
        return address;

    }
}

红色代码是为了防止内存穿透，比如你这个业务方法有10000个人同时访问，如果不加锁。当第一次访问都判断address为空 然后全部去查数据库，正常应该是一个连接查询数据库并设置缓存 后面9999都使用缓存

通过redis Desktop Manager查看结果

因默认key 和value都是用jdk自带的序列化方式JdkSerializationRedisSerializer 可以发现可读性很差

自定义序列化方式

新增一个redisConfig 配置序列化方式

@Configuration
public class RedisConfig {

    /**
     * redisTemplate 序列化使用的jdkSerializeable, 存储二进制字节码, 所以自定义序列化类
     * @param redisConnectionFactory
     * @return
     */
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);

        // 使用Jackson2JsonRedisSerialize 替换默认序列化
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);

        jackson2JsonRedisSerializer.setObjectMapper(objectMapper);

        // 设置value的序列化规则和 key的序列化规则
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }
}

再次测试结果

集群版

1.application.properties配置

  redis:
    cluster:
      master: myMaster
      nodes: 192.168.65.128:6379,192.168.65.128:6380,192.168.65.128:6381,192.168.65.128:6382,192.168.65.128:6383,192.168.65.128:6384
    timeout: 0

2.配置jedisCluster

@Configuration
public class RedisConfig {

    @Value("${spring.redis.cluster.nodes}")
    private String clusterNodes;
    @Value("${spring.redis.timeout}")
    private int timeout;

    @Bean
    public JedisCluster getJedisCluster() {
        String[] cNodes = clusterNodes.split(",");
        Set<HostAndPort> nodes = new HashSet<HostAndPort>();
        // 分割出集群节点
        for (String node : cNodes) {
            String[] hp = node.split(":");
            nodes.add(new HostAndPort(hp[0],Integer.parseInt(hp[1])));
        }

        // 创建集群对象
//      JedisCluster jedisCluster = new JedisCluster(nodes,commandTimeout);
        JedisCluster jedisCluster = new JedisCluster(nodes);
        return jedisCluster;
    }
}

3.缓存操作 都通过jedisCluster来操作

如

package com.liqiang.utils;

import com.fasterxml.jackson.databind.JsonSerializable;
import org.apache.tomcat.util.buf.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.SerializationUtils;
import redis.clients.jedis.JedisCluster;
import tk.mybatis.mapper.util.StringUtil;

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.util.LinkedHashMap;
import java.util.Map;

@Component
public class RedisUtil {

    protected int DEFAULT_EXPIRED_TIME_SECONDS_OBJECT = 1296000;

    @Autowired
    private JedisCluster jedisCluster;

    public boolean putString(String sKey, String sValue, int expiredInSeconds) {
        boolean result = false;

        if (StringUtil.isEmpty(sKey)) {
            return result;
        }

        if (this.jedisCluster != null) {
            this.jedisCluster.set(sKey, sValue);
            if (expiredInSeconds > 0) {
                this.jedisCluster.expire(sKey, expiredInSeconds);
            }

            result = true;
        }

        return result;
    }

    public boolean putString(String sKey, String sValue) {
        return putString(sKey, sValue, this.DEFAULT_EXPIRED_TIME_SECONDS_OBJECT);
    }

    public String getString(String sKey) {
        String result = null;
        if (StringUtil.isEmpty(sKey)) {
            return result;
        }

        if (this.jedisCluster != null) {
            result = this.jedisCluster.get(sKey);
        }

        return result;
    }

    public boolean putObject(String sKey, Serializable object, int expiredInSeconds) {
        boolean result = false;

        if (StringUtil.isEmpty(sKey)) {
            return result;
        }

        if (this.jedisCluster != null) {
            byte[] datas = SerializationUtils.serialize(object);
            byte[] arrKey = sKey.getBytes();

            this.jedisCluster.set(arrKey, datas);
            if (expiredInSeconds > 0) {
                this.jedisCluster.expire(arrKey, expiredInSeconds);
            }

            result = true;
        }

        return result;
    }

    public boolean putObject(String sKey, Serializable object) {
        return putObject(sKey, object, this.DEFAULT_EXPIRED_TIME_SECONDS_OBJECT);
    }

    public <T> T getObject(String sKey, Class<T> oclass) {
        Object result = null;
        if (StringUtil.isEmpty(sKey)) {
            return null;
        }

        System.out.println(sKey);
        if (this.jedisCluster != null) {
            byte[] arrKey = sKey.getBytes();

            byte[] datas = this.jedisCluster.get(arrKey);

            if ((datas != null) && (datas.length > 0)) {
                result = SerializationUtils.deserialize(datas);
            }
        }
        System.out.println("dddd");
       System.out.println(result);
        return (T) result;
    }

    public boolean putMap(String sKey, Map<String, String> oMap, int expiredInSeconds) {
        boolean result = false;

        if ((StringUtil.isEmpty(sKey)) || (oMap == null) || (oMap.size() <= 0)) {
            return result;
        }

        if (this.jedisCluster != null) {
            this.jedisCluster.hmset(sKey, oMap);
            if (expiredInSeconds > 0) {
                this.jedisCluster.expire(sKey, expiredInSeconds);
            }

            result = true;
        }

        return result;
    }

    public boolean putMap(String sKey, Map<String, String> oMap) {
        return putMap(sKey, oMap, this.DEFAULT_EXPIRED_TIME_SECONDS_OBJECT);
    }

    public boolean putMap(String sKey, String sField, String sValue, int expiredInSeconds) {
        boolean result = false;

        if ((StringUtil.isEmpty(sKey)) || (StringUtil.isEmpty(sField))) {
            return result;
        }

        if (this.jedisCluster != null) {
            this.jedisCluster.hset(sKey, sField, sValue);
            if (expiredInSeconds > 0) {
                this.jedisCluster.expire(sKey, expiredInSeconds);
            }

            result = true;
        }

        return result;
    }

    public boolean putMap(String sKey, String sField, String sValue) {
        return putMap(sKey, sField, sValue, this.DEFAULT_EXPIRED_TIME_SECONDS_OBJECT);
    }

    public Map<String, String> getMap(String sKey) {
        Map result = null;
        if (StringUtil.isEmpty(sKey)) {
            return result;
        }

        if (this.jedisCluster != null) {
            result = this.jedisCluster.hgetAll(sKey);
        }

        return result;
    }

    public Map<String, String> getMap(String sKey, String[] fields) {
        Map result = null;

        Map mapAll = getMap(sKey);
        if ((mapAll != null) && (mapAll.size() > 0) && (fields != null) && (fields.length > 0)) {
            result = new LinkedHashMap();
            for (String field : fields) {
                result.put(field, mapAll.get(field));
            }

        }

        return result;
    }

    public boolean existsMapItem(String sKey, String sField) {
        if ((StringUtil.isEmpty(sKey)) || (StringUtil.isEmpty(sField))) {
            return false;
        }

        if (this.jedisCluster != null) {
            return this.jedisCluster.hexists(sKey, sField).booleanValue();
        }

        return false;
    }

    public boolean putMapValueAsObject(String sKey, String sField, Serializable oValue, int expiredInSeconds) {
        boolean result = false;

        if ((StringUtil.isEmpty(sKey)) || (StringUtil.isEmpty(sField))) {
            return result;
        }

        if (this.jedisCluster != null) {
            byte[] arrKey = sKey.getBytes();

            this.jedisCluster.hset(arrKey, sField.getBytes(), SerializationUtils.serialize(oValue));
            if (expiredInSeconds > 0) {
                this.jedisCluster.expire(arrKey, expiredInSeconds);
            }

            result = true;
        }

        return result;
    }

    public boolean putMapValueAsObject(String sKey, String sField, Serializable oValue) {
        return putMapValueAsObject(sKey, sField, oValue, this.DEFAULT_EXPIRED_TIME_SECONDS_OBJECT);
    }

    public <T> T getMapValueAsObject(String sKey, String sField, Class<T> oClass) {
        Object result = null;

        if ((StringUtil.isEmpty(sKey)) || (StringUtil.isEmpty(sField))) {
            return null;
        }

        if (this.jedisCluster != null) {
            byte[] datas = this.jedisCluster.hget(sKey.getBytes(), sField.getBytes());
            if ((datas != null) && (datas.length > 0)) {
                Object tmpObject = SerializationUtils.deserialize(datas);
                result = tmpObject;
            }
        }

        return (T) result;
    }

    public void remove(String sKey) {
        if (StringUtil.isEmpty(sKey)) {
            return;
        }

        if (this.jedisCluster != null)
            this.jedisCluster.del(sKey);
    }

}