Redis基本操做之Java實現(全部類型)

時間  2019-12-11
標籤 redis 基本 java 實現 全部 類型 欄目 Redis 简体版
原文   原文鏈接

前不久分享過Redis的基本數據結構及基本命令詳解。在熟悉了redis的基本操做以後（若是還有對redis的基本操做不熟悉的，能夠點擊前面的鏈接先熟悉下），今天給你們分享下實際開發中對redis操做的Java實現版本。java

Maven依賴

使用maven來構建項目在當下應該已是主流了，因此咱們也不例外使用了Maven。由於使用了spring對redis封裝的jar，因此也須要引入spring基本jar，Maven依賴以下：正則表達式

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.1.5.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-redis</artifactId>
    <version>2.1.3.RELEASE</version>
</dependency>
<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.9.2</version>
</dependency>
<dependency>
    <groupId></groupId>
    <artifactId>redis</artifactId>
</dependency>

實現代碼

實現代碼篇幅有點長，並且segmentfault代碼div的高度有限制，建議你們把代碼拷貝到開發工具中再閱讀。redis

package spring.redis;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.stereotype.Service;

import java.io.UnsupportedEncodingException;
import java.util.*;
import java.util.stream.Collectors;

@Service
public class SpringRedisHandler implements InitializingBean {

    //redis編碼
    private static final String redisCode = "utf-8";
    private static final String EmptyString = "";

    @Autowired
    private RedisTemplate<String, String> jtRedis;

    /**
     * 設置key-value【不含超時時間】
     *
     * @param key
     * @param value
     */
    public void set(String key, Object value) {
        this.set(key, String.valueOf(value), 0L);
    }

    /**
     * 設置key-value【含超時時間】
     *
     * @param key
     * @param value
     * @param liveTime
     */
    public void set(String key, Object value, long liveTime) {
        this.set(key.getBytes(), String.valueOf(value).getBytes(), liveTime);
    }


    @SuppressWarnings({"unchecked", "rawtypes"})
    private void set(final byte[] key, final byte[] value, final long liveTime) {
        jtRedis.execute(new RedisCallback() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                connection.set(key, value);
                if (liveTime > 0) {
                    connection.expire(key, liveTime);
                }
                return 1L;
            }
        });
    }

    /**
     * get key的值
     *
     * @param key
     * @return
     */
    public String get(final String key) {
        return jtRedis.execute(new RedisCallback<String>() {
            @Override
            public String doInRedis(RedisConnection connection) throws DataAccessException {
                try {
                    return new String(connection.get(key.getBytes()), redisCode);
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                    return "";
                }
            }
        });
    }

    /**
     * 是否存在key
     *
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return jtRedis.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.exists(key.getBytes());
            }
        });
    }

    /**
     * 某數據中全部key的總數
     *
     * @return
     */
    public long dbSize() {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.dbSize();
            }
        });
    }

    /**
     * 檢測redis服務器是否能平通
     */
    public String ping() {
        return jtRedis.execute(new RedisCallback<String>() {
            @Override
            public String doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.ping();
            }
        });
    }

    /**
     * value增長某個值
     *
     * @param key
     * @param value
     * @return
     */
    public Long incr(String key, long value) {
        return incr(key.getBytes(), value);
    }

    private Long incr(byte[] key, long value) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.incrBy(key, value);
            }
        });
    }

    /**
     * 自增
     *
     * @param key
     * @return
     */
    public Long incr(String key) {
        return incr(key.getBytes(), 1);
    }

    /**
     * 自減
     *
     * @param key
     * @return
     */
    public Long decr(String key) {
        return decr(key.getBytes(), 1);
    }

    /**
     * value減小某個值
     *
     * @param key
     * @param value
     * @return
     */
    public Long decr(String key, long value) {
        return decr(key.getBytes(), value);
    }

    private Long decr(byte[] key, long value) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.decrBy(key, value);
            }
        });
    }

    /**
     * 刪除key
     *
     * @param key
     * @return
     */
    public Long del(String key) {
        return del(key.getBytes());
    }

    private Long del(byte[] key) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.del(key);
            }
        });
    }

    /**
     * flushdb：刪除db下的全部數據
     */
    @SuppressWarnings({"rawtypes", "unchecked"})
    public void flushDb() {
        jtRedis.execute(new RedisCallback() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                connection.flushDb();
                return 1L;
            }
        });
    }

    /**
     * 設置hash
     *
     * @param key
     * @param field
     * @param value
     * @return
     */
    public Boolean hSet(String key, String field, String value) {
        return jtRedis.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return redisConnection.hSet(key.getBytes(), field.getBytes(), value.getBytes());
            }
        });
    }

    /**
     * 獲取hash的屬性值
     *
     * @param key
     * @param field
     * @return
     */
    public String hGet(String key, String field) {
        return jtRedis.execute(new RedisCallback<String>() {
            @Override
            public String doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return new String(redisConnection.hGet(key.getBytes(), field.getBytes()));
            }
        });
    }

    /**
     * 批量設置hash
     *
     * @param key
     * @param values
     */
    public void hMSet(String key, Map<String, Object> values) {
        jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection redisConnection) throws DataAccessException {
                redisConnection.hMSet(key.getBytes(), stringObjectMapToBytes(values));
                return null;
            }
        });
    }

    /**
     * 批量獲取hash的多個屬性
     *
     * @param key
     * @param fields
     * @return
     */
    public List<String> hMGet(String key, String... fields) {
        return jtRedis.execute(new RedisCallback<List<String>>() {
            @Override
            public List<String> doInRedis(RedisConnection redisConnection) throws DataAccessException {
                List<String> listFileds = new ArrayList<>();
                for (int i = 0; i < fields.length; i++) {
                    listFileds.add(fields[i]);
                }

                List<byte[]> byteFileds = stringListToByte(listFileds);
                return bytesListToString(redisConnection.hMGet(key.getBytes(), byteFileds.toArray(new byte[byteFileds.size()][byteFileds.size()])));
            }
        });
    }

    /**
     * 獲取hash的全部屬性
     *
     * @param key
     * @return
     */
    public Map<String, String> hGetAll(String key) {
        return jtRedis.execute(new RedisCallback<Map<String, String>>() {
            @Override
            public Map<String, String> doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return bytesMapToString(redisConnection.hGetAll(key.getBytes()));
            }
        });
    }

    /**
     * 針對hash中某個屬性增長指定的值
     *
     * @param key
     * @param field
     * @param value
     * @return
     */
    public Double hIncrBy(String key, String field, double value) {
        return jtRedis.execute(new RedisCallback<Double>() {
            @Override
            public Double doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return redisConnection.hIncrBy(key.getBytes(), field.getBytes(), value);
            }
        });
    }

    /**
     * hash是存在某屬性
     *
     * @param key
     * @param field
     * @return
     */
    public Boolean hExists(String key, String field) {
        return jtRedis.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return redisConnection.hExists(key.getBytes(), field.getBytes());
            }
        });
    }

    /**
     * 刪除hash的某屬性
     *
     * @param key
     * @param field
     * @return
     */
    public Long hDel(String key, String field) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return redisConnection.hDel(key.getBytes(), field.getBytes());
            }
        });
    }

    /**
     * 向zset中的某個key添加一個屬性幾分數（能夠根據分數排序）
     *
     * @param key
     * @param score
     * @param field
     * @return
     */
    public Boolean zAdd(String key, double score, String field) {
        return jtRedis.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return redisConnection.zAdd(key.getBytes(), score, field.getBytes());
            }
        });
    }

    /**
     * 給zset中的某個key中的某個屬性增長指定分數
     *
     * @param key
     * @param score
     * @param field
     * @return
     */
    public Double zIncrBy(String key, double score, String field) {
        return jtRedis.execute(new RedisCallback<Double>() {
            @Override
            public Double doInRedis(RedisConnection redisConnection) throws DataAccessException {
                return redisConnection.zIncrBy(key.getBytes(), score, field.getBytes());
            }
        });
    }

    /**
     * 從list左側插入一個元素
     *
     * @param key
     * @param values
     * @return
     */
    public Long lPush(String key, String value) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.lPush(key.getBytes(), value.getBytes());
            }
        });
    }

    /**
     * 從list左側插入多個元素
     *
     * @param key
     * @param values
     * @return
     */
    public Long lPush(String key, List<String> values) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                List<byte[]> bytes = stringListToByte(values);
                return connection.lPush(key.getBytes(), bytes.toArray(new byte[bytes.size()][bytes.size()]));
            }
        });
    }

    /**
     * 從list的左側取出一個元素
     *
     * @param key
     * @return
     */
    public String lPop(String key) {
        return jtRedis.execute(new RedisCallback<String>() {
            @Override
            public String doInRedis(RedisConnection connection) throws DataAccessException {
                if (connection.lLen(key.getBytes()) > 0) {
                    return new String(connection.lPop(key.getBytes()));
                } else {
                    return EmptyString;
                }
            }
        });
    }

    /**
     * 向list的右側插入一個元素
     *
     * @param key
     * @param value
     * @return
     */
    public Long rPush(String key, String value) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.rPush(key.getBytes(), value.getBytes());
            }
        });
    }

    /**
     * list的rpush，從右側插入多個元素
     *
     * @param key
     * @param values
     * @return
     */
    public Long rPush(String key, List<String> values) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                List<byte[]> bytes = stringListToByte(values);
                return connection.rPush(key.getBytes(), bytes.toArray(new byte[bytes.size()][bytes.size()]));
            }
        });
    }

    /**
     * 從list的右側取出一個元素
     *
     * @param key
     * @return
     */
    public String rPop(String key) {
        return jtRedis.execute(new RedisCallback<String>() {
            @Override
            public String doInRedis(RedisConnection connection) throws DataAccessException {
                if (connection.lLen(key.getBytes()) > 0) {
                    return new String(connection.rPop(key.getBytes()));
                } else {
                    return EmptyString;
                }
            }
        });
    }

    /**
     * 給set中添加元素
     *
     * @param key
     * @param values
     * @return
     */
    public Long sadd(String key, List<String> values) {
        return jtRedis.execute(new RedisCallback<Long>() {
            @Override
            public Long doInRedis(RedisConnection connection) throws DataAccessException {
                List<byte[]> bytes = stringListToByte(values);
                return connection.sAdd(key.getBytes(), bytes.toArray(new byte[bytes.size()][bytes.size()]));
            }
        });
    }

    /**
     * 獲取set中的全部元素
     *
     * @param key
     * @return
     */
    public List<String> smembers(String key) {
        return jtRedis.execute(new RedisCallback<List<String>>() {
            @Override
            public List<String> doInRedis(RedisConnection connection) throws DataAccessException {
                return bytesListToString(connection.sMembers(key.getBytes()));
            }
        });
    }

    /**
     * set中是否包含某元素
     *
     * @param key
     * @param value
     * @return
     */
    public Boolean sIsMember(String key, String value) {
        return jtRedis.execute(new RedisCallback<Boolean>() {
            @Override
            public Boolean doInRedis(RedisConnection connection) throws DataAccessException {
                return connection.sIsMember(key.getBytes(), value.getBytes());
            }
        });
    }

    private byte[][] change(List<byte[]> values) {
        byte[][] result = {};
        return result;
    }

    private List<byte[]> stringListToByte(List<String> values) {
        return values
                .stream()
                .map(p -> p.getBytes())
                .collect(
                        Collectors.toList()
                );
    }

    private List<String> bytesListToString(Collection<byte[]> values) {
        return values
                .stream()
                .map(p -> new String(p))
                .collect(
                        Collectors.toList()
                );
    }

    private Map<String, String> bytesMapToString(Map<byte[], byte[]> values) {
        Map<String, String> result = new HashMap<>();
        values.forEach((k, v) -> result.put(new String(k), new String(v)));
        return result;
    }

    private Map<byte[], byte[]> stringObjectMapToBytes(Map<String, Object> values) {
        Map<byte[], byte[]> result = new HashMap<>();
        values.forEach((k, v) -> result.put(k.getBytes(), String.valueOf(v).getBytes()));
        return result;
    }

    /**
     * 正則表達式獲取值
     *
     * @param pattern
     * @return
     */
    public Set<String> keys(String pattern) {
        return jtRedis.keys(pattern);
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        RedisSerializer<String> stringSerializer = new StringRedisSerializer();
        jtRedis.setKeySerializer(stringSerializer);
        jtRedis.setValueSerializer(stringSerializer);
        jtRedis.setHashKeySerializer(stringSerializer);
        jtRedis.setHashValueSerializer(stringSerializer);
    }
}

配置文件

配置文件主要有兩個，一個是spirng相關配置的配置文件applicationContext-redis.xml，還有一個是redis相關配置文件redis-config.properties
applicationContext-redis.xml配置文件內容以下：spring

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd">
        
    <context:component-scan base-package="spring.redis"></context:component-scan>

    <!-- 加載redis配置文件 -->
    <context:property-placeholder location="classpath:redis-config.properties"/>

    <!-- 實例化redis配置 -->
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxIdle" value="${redis.maxIdle}"/>
        <property name="maxWaitMillis" value="${redis.maxWait}"/>
        <property name="testOnBorrow" value="${redis.testOnBorrow}"/>
    </bean>

    <!--redis鏈接工廠-->
    <bean id="dsRedis" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="hostName" value="${redis.host}"/>
        <property name="port" value="${redis.port}"/>
        <property name="password" value="${redis.pass}"/>
        <property name="database" value="${redis.database}"/>
        <property name="poolConfig" ref="poolConfig"/>
    </bean>

    <bean id="jtRedis" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="dsRedis"/>
    </bean>
</beans>

redis-config.properties配置文件內容以下：數據庫

#裝有redis數據庫的虛擬機中的一臺機器的ip
redis.host=127.0.0.1
redis.port=6379
redis.pass=
#默認存儲在databse[0]數據庫, redis的database至關於一個數據,默認也是0
redis.database=0
#maxIdle:最大空閒數
redis.maxIdle=300
#maxWait:最大等待時長,3秒
redis.maxWait=3000
#testOnBorrow：在提取一個jedis實例時，是否提早進行驗證操做；若是爲true，則獲得的jedis實例均是可用的；
redis.testOnBorrow=true

結語

雖然代碼篇幅有點長，可是都是基於spring封裝以後的再次封裝，你們應該都能理解。而且以上方法我都有測試過，親測可用，由於測試代碼也比較的簡單，所以就不貼出來了。最後，歡迎你們補充、批評、指正。
相關文章
相關標籤/搜索
每日一句
    每一个你不满意的现在，都有一个你没有努力的曾经。
本站公眾號
   歡迎關注本站公眾號,獲取更多信息
聯繫我們 最近搜索 最新文章 沪ICP备13005482号-10 MyBatis教程 SQL 教程 MySQL教程 Java 教程 Thymeleaf 教程 Hibernate教程 Spring教程 Redis教程