java操作redis

Posted 2021-01-31 宋宋宋哥

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一、添加依赖

<!--redis-->
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>2.8.2</version>
        </dependency>

二、配置yml文件

# redis相关配置
jedis :
  pool :
#  线上库
    host : ip
    port : 6379
    config :
      maxTotal: 100
      maxIdle: 10
      maxWaitMillis : 100000

三、添加配置文件

package com.***.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;


@Configuration
public class RedisConfiguration {
    @Bean(name = "jedis.pool")
    @Autowired
    public JedisPool jedisPool(@Qualifier("jedis.pool.config") JedisPoolConfig config, @Value("${jedis.pool.host}") String host, @Value("${jedis.pool.port}") int port) {
        return new JedisPool(config, host, port);
    }

    @Bean(name = "jedis.pool.config")
    public JedisPoolConfig jedisPoolConfig(@Value("${jedis.pool.config.maxTotal}") int maxTotal, @Value("${jedis.pool.config.maxIdle}") int maxIdle, @Value("${jedis.pool.config.maxWaitMillis}") int maxWaitMillis) {
        JedisPoolConfig config = new JedisPoolConfig();
        config.setMaxTotal(maxTotal);
        config.setMaxIdle(maxIdle);
        config.setMaxWaitMillis(maxWaitMillis);
        return config;
    }
}

四、创建redis工具类

package com.***.utils;

import com.google.common.collect.Lists;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import java.util.Iterator;
import java.util.List;
import java.util.Set;

@Component
public class RedisClientUtil {
    @Autowired
    private JedisPool jedisPool;

    /**
     * 获取Jedis实例
     *
     * @return
     */
    public Jedis getJedis() {
        return jedisPool.getResource();
    }

    /**
     * 存放数据到redis
     *
     * @param key
     * @param value
     * @return
     */
    public boolean set(String key, String value) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            jedis.set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 存放数据到redis，并设置缓存时间
     *
     * @param key
     * @param value
     * @param time  过期时间(秒)
     * @return
     */
    public boolean set(String key, String value, Integer time) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            jedis.set(key, value);
            if (time > 0) {
                jedis.expire(key, time);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 判断某个key是否存在
     *
     * @param key
     * @return
     */
    public boolean exist(String key) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            return jedis.exists(key);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 以key删除某个数据
     *
     * @param key
     * @return
     */
    public Long del(String key) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            return jedis.del(key);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            // 返还到连接池
            returnResource(jedis);
        }
    }

    /**
     * 通过key获取value
     *
     * @param key
     * @return
     */
    public String get(String key) {
        String value = null;
        Jedis jedis = null;
        try {
            jedis = getJedis();
            value = jedis.get(key);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 返还到连接池
            returnResource(jedis);
        }
        return value;
    }

    /**
     * 将jedis返还到连接池
     *
     * @param jedis
     */
    public void returnResource(Jedis jedis) {
        if (jedis != null) {
            jedisPool.returnResource(jedis);
        }
    }

    /**
     * 在名称为key的list尾添加一个值为value的元素
     *
     * @param key
     * @param value
     * @return
     */
    public <T> boolean rpush(String key, T value) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            jedis.rpush(key.getBytes(), SerializeUtil.serialize(value));
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 在名称为key的list头添加一个值为value的元素
     *
     * @param key
     * @param value
     * @return
     */
    public boolean lpush(byte[] key, byte[] value) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            jedis.lpush(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 返回名称为key的list中start至end之间的元素（下标从0开始，下同）
     *
     * @param key
     * @param start
     * @param end
     * @return
     */
    public <T> List<T> lrange(byte[] key, Integer start, Integer end) {
        Jedis jedis = null;
        List<T> t = Lists.newArrayList();
        try {
            jedis = getJedis();
            List<byte[]> list = jedis.lrange(key, start, end);
            list.forEach(bytes -> {
                Object o = SerializeUtil.unserialize(bytes);
                if (o!=null){
                    t.add((T)o);
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return t;
    }


    public Long llen(String key) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            return jedis.llen(key);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return 0l;
    }


    public boolean setObject(String key, Object value) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            byte[] bytes = SerializeUtil.serialize(value);
            jedis.set(key.getBytes(), bytes);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 存放数据
     *
     * @param key     存储的key
     * @param value   需要存储的数据
     * @param express key失效时间
     * @return
     */
    public <T> boolean setObject(String key, T value, int express) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            byte[] bytes = SerializeUtil.serialize(value);
            jedis.set(key.getBytes(), bytes);
            jedis.expire(key, express);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 删除key集合
     */
    public <T> boolean delKeys(List<String> keys) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            for (String key : keys) {
                jedis.del(key.getBytes());
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }

    /**
     * 获取数据
     *
     * @param key 存储的key
     * @return
     */
    public <T> T getObject(String key) {
        Object value = null;
        Jedis jedis = null;
        try {
            jedis = getJedis();
            byte[] bytes = jedis.get(key.getBytes());
            value = SerializeUtil.unserialize(bytes);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 返还到连接池
            returnResource(jedis);
        }
        if (value != null) {
            return (T) value;
        }
        return null;
    }

    /**
     * 将key的时间置为0，即清除缓存
     *
     * @param key 将key的时间置为0，即清除缓存
     */
    public void expire(String key) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            jedis.expire(key, 0);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 返还到连接池
            returnResource(jedis);
        }
    }

    /**
     * 删除以某字符串为前缀的key集合
     */
    public <T> boolean delKeysMatch(String keyMatch) {
        Jedis jedis = null;
        try {
            jedis = getJedis();
            Set<String> keys = jedis.keys(keyMatch + "*");
            Iterator<String> it = keys.iterator();
            while (it.hasNext()) {
                String keyStr = it.next();
                jedis.del(keyStr);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //返还到连接池
            returnResource(jedis);
        }
        return false;
    }
}

需要的序列化工具类

package com.***.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class SerializeUtil {

    //序列化
    public static byte[] serialize(Object object) {
        ObjectOutputStream oos = null;
        ByteArrayOutputStream baos = null;
        try {

            baos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(baos);
            oos.writeObject(object);
            byte[] bytes = baos.toByteArray();
            return bytes;
        } catch (Exception e) {
        }
        return null;
    }
    //反序列化
    public static Object unserialize(byte[] bytes) {
        ByteArrayInputStream bais = null;
        try {

            bais = new ByteArrayInputStream(bytes);
            ObjectInputStream ois = new ObjectInputStream(bais);
            return ois.readObject();
        } catch (Exception e) {
        }
        return null;
    }
}

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