一.redis简介
Redis 是完全开源免费的,遵守BSD协议,是一个高性能的key-value数据库
Redis支持数据的持久化,可以将内存中的数据保存在磁盘中,重启的时候可以再次加载进行使用。
Redis不仅仅支持简单的key-value类型的数据,同时还提供list,set,zset,hash等数据结构的存储。
Redis支持数据的备份,即master-slave模式的数据备份。
两种持久化机制:https://www.cnblogs.com/xingzc/p/5988080.html
二.Spring配置redis
配置jedis的jar包:pom.xml:
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>3.0.1</version>
</dependency>
redis.properties(redis配置信息):
redis.hostname=127.0.0.1
redis.port=6379
redis.database=0
redis.pool.maxActive=600
redis.pool.maxIdle=300
redis.pool.maxWait=3000
redis.pool.testOnBorrow=true
加载redis配置信息:
连接池对象操作类(JedisPoolWriper):
package com.swpu.o2o.cache; import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig; /**
* 强指定redis的JedisPool接口构造函数,这样才能在centos成功创建jedispool
*
* @author xiangze
*
*/
public class JedisPoolWriper {
//连接池对象
private JedisPool jedisPool; public JedisPoolWriper(final JedisPoolConfig poolConfig, final String host,
final int port) {
try {
//通过连接池配置信息,IP,端口构造连接池对象
jedisPool = new JedisPool(poolConfig, host, port);
} catch (Exception e) {
e.printStackTrace();
}
}
//获取redis连接池对象
public JedisPool getJedisPool() {
return jedisPool;
}
//注入redis连接池对象
public void setJedisPool(JedisPool jedisPool) {
this.jedisPool = jedisPool;
} }
封装好的redis相关操作(工具类,JedisUtil):
package com.swpu.o2o.cache; import java.util.List;
import java.util.Map;
import java.util.Set; import redis.clients.jedis.BinaryClient.LIST_POSITION;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.SortingParams;
import redis.clients.util.SafeEncoder; public class JedisUtil {
/**
* 缓存生存时间
*/
private final int expire = 60000;
/** 操作Key的方法 */
public Keys KEYS;
/** 对存储结构为String类型的操作 */
public Strings STRINGS;
/** 对存储结构为List类型的操作 */
public Lists LISTS;
/** 对存储结构为Set类型的操作 */
public Sets SETS;
/** 对存储结构为HashMap类型的操作 */
public Hash HASH; private JedisPool jedisPool; public JedisPool getJedisPool() {
return jedisPool;
} public void setJedisPool(JedisPoolWriper jedisPoolWriper) {
this.jedisPool = jedisPoolWriper.getJedisPool();
} public JedisPool getPool() {
return jedisPool;
} /**
* 从jedis连接池中获取获取jedis对象
*
* @return
*/
public Jedis getJedis() {
return jedisPool.getResource();
} /**
* 设置过期时间
*
* @author ruan 2013-4-11
* @param key
* @param seconds
*/
public void expire(String key, int seconds) {
if (seconds <= 0) {
return;
}
Jedis jedis = getJedis();
jedis.expire(key, seconds);
jedis.close();
} /**
* 设置默认过期时间
*
* @author ruan 2013-4-11
* @param key
*/
public void expire(String key) {
expire(key, expire);
} // *******************************************Keys*******************************************//
public class Keys { /**
* 清空所有key
*/
public String flushAll() {
Jedis jedis = getJedis();
String stata = jedis.flushAll();
jedis.close();
return stata;
} /**
* 更改key
*
* @param String
* oldkey
* @param String
* newkey
* @return 状态码
* */
public String rename(String oldkey, String newkey) {
return rename(SafeEncoder.encode(oldkey),
SafeEncoder.encode(newkey));
} /**
* 更改key,仅当新key不存在时才执行
*
* @param String
* oldkey
* @param String
* newkey
* @return 状态码
* */
public long renamenx(String oldkey, String newkey) {
Jedis jedis = getJedis();
long status = jedis.renamenx(oldkey, newkey);
jedis.close();
return status;
} /**
* 更改key
*
* @param String
* oldkey
* @param String
* newkey
* @return 状态码
* */
public String rename(byte[] oldkey, byte[] newkey) {
Jedis jedis = getJedis();
String status = jedis.rename(oldkey, newkey);
jedis.close();
return status;
} /**
* 设置key的过期时间,以秒为单位
*
* @param String
* key
* @param 时间
* ,已秒为单位
* @return 影响的记录数
* */
public long expired(String key, int seconds) {
Jedis jedis = getJedis();
long count = jedis.expire(key, seconds);
jedis.close();
return count;
} /**
* 设置key的过期时间,它是距历元(即格林威治标准时间 1970 年 1 月 1 日的 00:00:00,格里高利历)的偏移量。
*
* @param String
* key
* @param 时间
* ,已秒为单位
* @return 影响的记录数
* */
public long expireAt(String key, long timestamp) {
Jedis jedis = getJedis();
long count = jedis.expireAt(key, timestamp);
jedis.close();
return count;
} /**
* 查询key的过期时间
*
* @param String
* key
* @return 以秒为单位的时间表示
* */
public long ttl(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
long len = sjedis.ttl(key);
sjedis.close();
return len;
} /**
* 取消对key过期时间的设置
*
* @param key
* @return 影响的记录数
* */
public long persist(String key) {
Jedis jedis = getJedis();
long count = jedis.persist(key);
jedis.close();
return count;
} /**
* 删除keys对应的记录,可以是多个key
*
* @param String
* ... keys
* @return 删除的记录数
* */
public long del(String... keys) {
Jedis jedis = getJedis();
long count = jedis.del(keys);
jedis.close();
return count;
} /**
* 删除keys对应的记录,可以是多个key
*
* @param String
* ... keys
* @return 删除的记录数
* */
public long del(byte[]... keys) {
Jedis jedis = getJedis();
long count = jedis.del(keys);
jedis.close();
return count;
} /**
* 判断key是否存在
*
* @param String
* key
* @return boolean
* */
public boolean exists(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
boolean exis = sjedis.exists(key);
sjedis.close();
return exis;
} /**
* 对List,Set,SortSet进行排序,如果集合数据较大应避免使用这个方法
*
* @param String
* key
* @return List<String> 集合的全部记录
* **/
public List<String> sort(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<String> list = sjedis.sort(key);
sjedis.close();
return list;
} /**
* 对List,Set,SortSet进行排序或limit
*
* @param String
* key
* @param SortingParams
* parame 定义排序类型或limit的起止位置.
* @return List<String> 全部或部分记录
* **/
public List<String> sort(String key, SortingParams parame) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<String> list = sjedis.sort(key, parame);
sjedis.close();
return list;
} /**
* 返回指定key存储的类型
*
* @param String
* key
* @return String string|list|set|zset|hash
* **/
public String type(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
String type = sjedis.type(key);
sjedis.close();
return type;
} /**
* 查找所有匹配给定的模式的键
*
* @param String
* key的表达式,*表示多个,?表示一个
* */
public Set<String> keys(String pattern) {
Jedis jedis = getJedis();
Set<String> set = jedis.keys(pattern);
jedis.close();
return set;
}
} // *******************************************Sets*******************************************//
public class Sets { /**
* 向Set添加一条记录,如果member已存在返回0,否则返回1
*
* @param String
* key
* @param String
* member
* @return 操作码,0或1
* */
public long sadd(String key, String member) {
Jedis jedis = getJedis();
long s = jedis.sadd(key, member);
jedis.close();
return s;
} public long sadd(byte[] key, byte[] member) {
Jedis jedis = getJedis();
long s = jedis.sadd(key, member);
jedis.close();
return s;
} /**
* 获取给定key中元素个数
*
* @param String
* key
* @return 元素个数
* */
public long scard(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
long len = sjedis.scard(key);
sjedis.close();
return len;
} /**
* 返回从第一组和所有的给定集合之间的差异的成员
*
* @param String
* ... keys
* @return 差异的成员集合
* */
public Set<String> sdiff(String... keys) {
Jedis jedis = getJedis();
Set<String> set = jedis.sdiff(keys);
jedis.close();
return set;
} /**
* 这个命令等于sdiff,但返回的不是结果集,而是将结果集存储在新的集合中,如果目标已存在,则覆盖。
*
* @param String
* newkey 新结果集的key
* @param String
* ... keys 比较的集合
* @return 新集合中的记录数
* **/
public long sdiffstore(String newkey, String... keys) {
Jedis jedis = getJedis();
long s = jedis.sdiffstore(newkey, keys);
jedis.close();
return s;
} /**
* 返回给定集合交集的成员,如果其中一个集合为不存在或为空,则返回空Set
*
* @param String
* ... keys
* @return 交集成员的集合
* **/
public Set<String> sinter(String... keys) {
Jedis jedis = getJedis();
Set<String> set = jedis.sinter(keys);
jedis.close();
return set;
} /**
* 这个命令等于sinter,但返回的不是结果集,而是将结果集存储在新的集合中,如果目标已存在,则覆盖。
*
* @param String
* newkey 新结果集的key
* @param String
* ... keys 比较的集合
* @return 新集合中的记录数
* **/
public long sinterstore(String newkey, String... keys) {
Jedis jedis = getJedis();
long s = jedis.sinterstore(newkey, keys);
jedis.close();
return s;
} /**
* 确定一个给定的值是否存在
*
* @param String
* key
* @param String
* member 要判断的值
* @return 存在返回1,不存在返回0
* **/
public boolean sismember(String key, String member) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
boolean s = sjedis.sismember(key, member);
sjedis.close();
return s;
} /**
* 返回集合中的所有成员
*
* @param String
* key
* @return 成员集合
* */
public Set<String> smembers(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
Set<String> set = sjedis.smembers(key);
sjedis.close();
return set;
} public Set<byte[]> smembers(byte[] key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
Set<byte[]> set = sjedis.smembers(key);
sjedis.close();
return set;
} /**
* 将成员从源集合移出放入目标集合 <br/>
* 如果源集合不存在或不包哈指定成员,不进行任何操作,返回0<br/>
* 否则该成员从源集合上删除,并添加到目标集合,如果目标集合中成员已存在,则只在源集合进行删除
*
* @param String
* srckey 源集合
* @param String
* dstkey 目标集合
* @param String
* member 源集合中的成员
* @return 状态码,1成功,0失败
* */
public long smove(String srckey, String dstkey, String member) {
Jedis jedis = getJedis();
long s = jedis.smove(srckey, dstkey, member);
jedis.close();
return s;
} /**
* 从集合中删除成员
*
* @param String
* key
* @return 被删除的成员
* */
public String spop(String key) {
Jedis jedis = getJedis();
String s = jedis.spop(key);
jedis.close();
return s;
} /**
* 从集合中删除指定成员
*
* @param String
* key
* @param String
* member 要删除的成员
* @return 状态码,成功返回1,成员不存在返回0
* */
public long srem(String key, String member) {
Jedis jedis = getJedis();
long s = jedis.srem(key, member);
jedis.close();
return s;
} /**
* 合并多个集合并返回合并后的结果,合并后的结果集合并不保存<br/>
*
* @param String
* ... keys
* @return 合并后的结果集合
* @see sunionstore
* */
public Set<String> sunion(String... keys) {
Jedis jedis = getJedis();
Set<String> set = jedis.sunion(keys);
jedis.close();
return set;
} /**
* 合并多个集合并将合并后的结果集保存在指定的新集合中,如果新集合已经存在则覆盖
*
* @param String
* newkey 新集合的key
* @param String
* ... keys 要合并的集合
* **/
public long sunionstore(String newkey, String... keys) {
Jedis jedis = getJedis();
long s = jedis.sunionstore(newkey, keys);
jedis.close();
return s;
}
} // *******************************************Hash*******************************************//
public class Hash { /**
* 从hash中删除指定的存储
*
* @param String
* key
* @param String
* fieid 存储的名字
* @return 状态码,1成功,0失败
* */
public long hdel(String key, String fieid) {
Jedis jedis = getJedis();
long s = jedis.hdel(key, fieid);
jedis.close();
return s;
} public long hdel(String key) {
Jedis jedis = getJedis();
long s = jedis.del(key);
jedis.close();
return s;
} /**
* 测试hash中指定的存储是否存在
*
* @param String
* key
* @param String
* fieid 存储的名字
* @return 1存在,0不存在
* */
public boolean hexists(String key, String fieid) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
boolean s = sjedis.hexists(key, fieid);
sjedis.close();
return s;
} /**
* 返回hash中指定存储位置的值
*
* @param String
* key
* @param String
* fieid 存储的名字
* @return 存储对应的值
* */
public String hget(String key, String fieid) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
String s = sjedis.hget(key, fieid);
sjedis.close();
return s;
} public byte[] hget(byte[] key, byte[] fieid) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
byte[] s = sjedis.hget(key, fieid);
sjedis.close();
return s;
} /**
* 以Map的形式返回hash中的存储和值
*
* @param String
* key
* @return Map<Strinig,String>
* */
public Map<String, String> hgetAll(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
Map<String, String> map = sjedis.hgetAll(key);
sjedis.close();
return map;
} /**
* 添加一个对应关系
*
* @param String
* key
* @param String
* fieid
* @param String
* value
* @return 状态码 1成功,0失败,fieid已存在将更新,也返回0
* **/
public long hset(String key, String fieid, String value) {
Jedis jedis = getJedis();
long s = jedis.hset(key, fieid, value);
jedis.close();
return s;
} public long hset(String key, String fieid, byte[] value) {
Jedis jedis = getJedis();
long s = jedis.hset(key.getBytes(), fieid.getBytes(), value);
jedis.close();
return s;
} /**
* 添加对应关系,只有在fieid不存在时才执行
*
* @param String
* key
* @param String
* fieid
* @param String
* value
* @return 状态码 1成功,0失败fieid已存
* **/
public long hsetnx(String key, String fieid, String value) {
Jedis jedis = getJedis();
long s = jedis.hsetnx(key, fieid, value);
jedis.close();
return s;
} /**
* 获取hash中value的集合
*
* @param String
* key
* @return List<String>
* */
public List<String> hvals(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<String> list = sjedis.hvals(key);
sjedis.close();
return list;
} /**
* 在指定的存储位置加上指定的数字,存储位置的值必须可转为数字类型
*
* @param String
* key
* @param String
* fieid 存储位置
* @param String
* long value 要增加的值,可以是负数
* @return 增加指定数字后,存储位置的值
* */
public long hincrby(String key, String fieid, long value) {
Jedis jedis = getJedis();
long s = jedis.hincrBy(key, fieid, value);
jedis.close();
return s;
} /**
* 返回指定hash中的所有存储名字,类似Map中的keySet方法
*
* @param String
* key
* @return Set<String> 存储名称的集合
* */
public Set<String> hkeys(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
Set<String> set = sjedis.hkeys(key);
sjedis.close();
return set;
} /**
* 获取hash中存储的个数,类似Map中size方法
*
* @param String
* key
* @return long 存储的个数
* */
public long hlen(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
long len = sjedis.hlen(key);
sjedis.close();
return len;
} /**
* 根据多个key,获取对应的value,返回List,如果指定的key不存在,List对应位置为null
*
* @param String
* key
* @param String
* ... fieids 存储位置
* @return List<String>
* */
public List<String> hmget(String key, String... fieids) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<String> list = sjedis.hmget(key, fieids);
sjedis.close();
return list;
} public List<byte[]> hmget(byte[] key, byte[]... fieids) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<byte[]> list = sjedis.hmget(key, fieids);
sjedis.close();
return list;
} /**
* 添加对应关系,如果对应关系已存在,则覆盖
*
* @param Strin
* key
* @param Map
* <String,String> 对应关系
* @return 状态,成功返回OK
* */
public String hmset(String key, Map<String, String> map) {
Jedis jedis = getJedis();
String s = jedis.hmset(key, map);
jedis.close();
return s;
} /**
* 添加对应关系,如果对应关系已存在,则覆盖
*
* @param Strin
* key
* @param Map
* <String,String> 对应关系
* @return 状态,成功返回OK
* */
public String hmset(byte[] key, Map<byte[], byte[]> map) {
Jedis jedis = getJedis();
String s = jedis.hmset(key, map);
jedis.close();
return s;
} } // *******************************************Strings*******************************************//
public class Strings {
/**
* 根据key获取记录
*
* @param String
* key
* @return 值
* */
public String get(String key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
String value = sjedis.get(key);
sjedis.close();
return value;
} /**
* 根据key获取记录
*
* @param byte[] key
* @return 值
* */
public byte[] get(byte[] key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
byte[] value = sjedis.get(key);
sjedis.close();
return value;
} /**
* 添加有过期时间的记录
*
* @param String
* key
* @param int seconds 过期时间,以秒为单位
* @param String
* value
* @return String 操作状态
* */
public String setEx(String key, int seconds, String value) {
Jedis jedis = getJedis();
String str = jedis.setex(key, seconds, value);
jedis.close();
return str;
} /**
* 添加有过期时间的记录
*
* @param String
* key
* @param int seconds 过期时间,以秒为单位
* @param String
* value
* @return String 操作状态
* */
public String setEx(byte[] key, int seconds, byte[] value) {
Jedis jedis = getJedis();
String str = jedis.setex(key, seconds, value);
jedis.close();
return str;
} /**
* 添加一条记录,仅当给定的key不存在时才插入
*
* @param String
* key
* @param String
* value
* @return long 状态码,1插入成功且key不存在,0未插入,key存在
* */
public long setnx(String key, String value) {
Jedis jedis = getJedis();
long str = jedis.setnx(key, value);
jedis.close();
return str;
} /**
* 添加记录,如果记录已存在将覆盖原有的value
*
* @param String
* key
* @param String
* value
* @return 状态码
* */
public String set(String key, String value) {
return set(SafeEncoder.encode(key), SafeEncoder.encode(value));
} /**
* 添加记录,如果记录已存在将覆盖原有的value
*
* @param String
* key
* @param String
* value
* @return 状态码
* */
public String set(String key, byte[] value) {
return set(SafeEncoder.encode(key), value);
} /**
* 添加记录,如果记录已存在将覆盖原有的value
*
* @param byte[] key
* @param byte[] value
* @return 状态码
* */
public String set(byte[] key, byte[] value) {
Jedis jedis = getJedis();
String status = jedis.set(key, value);
jedis.close();
return status;
} /**
* 从指定位置开始插入数据,插入的数据会覆盖指定位置以后的数据<br/>
* 例:String str1="123456789";<br/>
* 对str1操作后setRange(key,4,0000),str1="123400009";
*
* @param String
* key
* @param long offset
* @param String
* value
* @return long value的长度
* */
public long setRange(String key, long offset, String value) {
Jedis jedis = getJedis();
long len = jedis.setrange(key, offset, value);
jedis.close();
return len;
} /**
* 在指定的key中追加value
*
* @param String
* key
* @param String
* value
* @return long 追加后value的长度
* **/
public long append(String key, String value) {
Jedis jedis = getJedis();
long len = jedis.append(key, value);
jedis.close();
return len;
} /**
* 将key对应的value减去指定的值,只有value可以转为数字时该方法才可用
*
* @param String
* key
* @param long number 要减去的值
* @return long 减指定值后的值
* */
public long decrBy(String key, long number) {
Jedis jedis = getJedis();
long len = jedis.decrBy(key, number);
jedis.close();
return len;
} /**
* <b>可以作为获取唯一id的方法</b><br/>
* 将key对应的value加上指定的值,只有value可以转为数字时该方法才可用
*
* @param String
* key
* @param long number 要减去的值
* @return long 相加后的值
* */
public long incrBy(String key, long number) {
Jedis jedis = getJedis();
long len = jedis.incrBy(key, number);
jedis.close();
return len;
} /**
* 对指定key对应的value进行截取
*
* @param String
* key
* @param long startOffset 开始位置(包含)
* @param long endOffset 结束位置(包含)
* @return String 截取的值
* */
public String getrange(String key, long startOffset, long endOffset) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
String value = sjedis.getrange(key, startOffset, endOffset);
sjedis.close();
return value;
} /**
* 获取并设置指定key对应的value<br/>
* 如果key存在返回之前的value,否则返回null
*
* @param String
* key
* @param String
* value
* @return String 原始value或null
* */
public String getSet(String key, String value) {
Jedis jedis = getJedis();
String str = jedis.getSet(key, value);
jedis.close();
return str;
} /**
* 批量获取记录,如果指定的key不存在返回List的对应位置将是null
*
* @param String
* keys
* @return List<String> 值得集合
* */
public List<String> mget(String... keys) {
Jedis jedis = getJedis();
List<String> str = jedis.mget(keys);
jedis.close();
return str;
} /**
* 批量存储记录
*
* @param String
* keysvalues 例:keysvalues="key1","value1","key2","value2";
* @return String 状态码
* */
public String mset(String... keysvalues) {
Jedis jedis = getJedis();
String str = jedis.mset(keysvalues);
jedis.close();
return str;
} /**
* 获取key对应的值的长度
*
* @param String
* key
* @return value值得长度
* */
public long strlen(String key) {
Jedis jedis = getJedis();
long len = jedis.strlen(key);
jedis.close();
return len;
}
} // *******************************************Lists*******************************************//
public class Lists {
/**
* List长度
*
* @param String
* key
* @return 长度
* */
public long llen(String key) {
return llen(SafeEncoder.encode(key));
} /**
* List长度
*
* @param byte[] key
* @return 长度
* */
public long llen(byte[] key) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
long count = sjedis.llen(key);
sjedis.close();
return count;
} /**
* 覆盖操作,将覆盖List中指定位置的值
*
* @param byte[] key
* @param int index 位置
* @param byte[] value 值
* @return 状态码
* */
public String lset(byte[] key, int index, byte[] value) {
Jedis jedis = getJedis();
String status = jedis.lset(key, index, value);
jedis.close();
return status;
} /**
* 覆盖操作,将覆盖List中指定位置的值
*
* @param key
* @param int index 位置
* @param String
* value 值
* @return 状态码
* */
public String lset(String key, int index, String value) {
return lset(SafeEncoder.encode(key), index,
SafeEncoder.encode(value));
} /**
* 在value的相对位置插入记录
*
* @param key
* @param LIST_POSITION
* 前面插入或后面插入
* @param String
* pivot 相对位置的内容
* @param String
* value 插入的内容
* @return 记录总数
* */
public long linsert(String key, LIST_POSITION where, String pivot,
String value) {
return linsert(SafeEncoder.encode(key), where,
SafeEncoder.encode(pivot), SafeEncoder.encode(value));
} /**
* 在指定位置插入记录
*
* @param String
* key
* @param LIST_POSITION
* 前面插入或后面插入
* @param byte[] pivot 相对位置的内容
* @param byte[] value 插入的内容
* @return 记录总数
* */
public long linsert(byte[] key, LIST_POSITION where, byte[] pivot,
byte[] value) {
Jedis jedis = getJedis();
long count = jedis.linsert(key, where, pivot, value);
jedis.close();
return count;
} /**
* 获取List中指定位置的值
*
* @param String
* key
* @param int index 位置
* @return 值
* **/
public String lindex(String key, int index) {
return SafeEncoder.encode(lindex(SafeEncoder.encode(key), index));
} /**
* 获取List中指定位置的值
*
* @param byte[] key
* @param int index 位置
* @return 值
* **/
public byte[] lindex(byte[] key, int index) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
byte[] value = sjedis.lindex(key, index);
sjedis.close();
return value;
} /**
* 将List中的第一条记录移出List
*
* @param String
* key
* @return 移出的记录
* */
public String lpop(String key) {
return SafeEncoder.encode(lpop(SafeEncoder.encode(key)));
} /**
* 将List中的第一条记录移出List
*
* @param byte[] key
* @return 移出的记录
* */
public byte[] lpop(byte[] key) {
Jedis jedis = getJedis();
byte[] value = jedis.lpop(key);
jedis.close();
return value;
} /**
* 将List中最后第一条记录移出List
*
* @param byte[] key
* @return 移出的记录
* */
public String rpop(String key) {
Jedis jedis = getJedis();
String value = jedis.rpop(key);
jedis.close();
return value;
} /**
* 向List尾部追加记录
*
* @param String
* key
* @param String
* value
* @return 记录总数
* */
public long lpush(String key, String value) {
return lpush(SafeEncoder.encode(key), SafeEncoder.encode(value));
} /**
* 向List头部追加记录
*
* @param String
* key
* @param String
* value
* @return 记录总数
* */
public long rpush(String key, String value) {
Jedis jedis = getJedis();
long count = jedis.rpush(key, value);
jedis.close();
return count;
} /**
* 向List头部追加记录
*
* @param String
* key
* @param String
* value
* @return 记录总数
* */
public long rpush(byte[] key, byte[] value) {
Jedis jedis = getJedis();
long count = jedis.rpush(key, value);
jedis.close();
return count;
} /**
* 向List中追加记录
*
* @param byte[] key
* @param byte[] value
* @return 记录总数
* */
public long lpush(byte[] key, byte[] value) {
Jedis jedis = getJedis();
long count = jedis.lpush(key, value);
jedis.close();
return count;
} /**
* 获取指定范围的记录,可以做为分页使用
*
* @param String
* key
* @param long start
* @param long end
* @return List
* */
public List<String> lrange(String key, long start, long end) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<String> list = sjedis.lrange(key, start, end);
sjedis.close();
return list;
} /**
* 获取指定范围的记录,可以做为分页使用
*
* @param byte[] key
* @param int start
* @param int end 如果为负数,则尾部开始计算
* @return List
* */
public List<byte[]> lrange(byte[] key, int start, int end) {
// ShardedJedis sjedis = getShardedJedis();
Jedis sjedis = getJedis();
List<byte[]> list = sjedis.lrange(key, start, end);
sjedis.close();
return list;
} /**
* 删除List中c条记录,被删除的记录值为value
*
* @param byte[] key
* @param int c 要删除的数量,如果为负数则从List的尾部检查并删除符合的记录
* @param byte[] value 要匹配的值
* @return 删除后的List中的记录数
* */
public long lrem(byte[] key, int c, byte[] value) {
Jedis jedis = getJedis();
long count = jedis.lrem(key, c, value);
jedis.close();
return count;
} /**
* 删除List中c条记录,被删除的记录值为value
*
* @param String
* key
* @param int c 要删除的数量,如果为负数则从List的尾部检查并删除符合的记录
* @param String
* value 要匹配的值
* @return 删除后的List中的记录数
* */
public long lrem(String key, int c, String value) {
return lrem(SafeEncoder.encode(key), c, SafeEncoder.encode(value));
} /**
* 算是删除吧,只保留start与end之间的记录
*
* @param byte[] key
* @param int start 记录的开始位置(0表示第一条记录)
* @param int end 记录的结束位置(如果为-1则表示最后一个,-2,-3以此类推)
* @return 执行状态码
* */
public String ltrim(byte[] key, int start, int end) {
Jedis jedis = getJedis();
String str = jedis.ltrim(key, start, end);
jedis.close();
return str;
} /**
* 算是删除吧,只保留start与end之间的记录
*
* @param String
* key
* @param int start 记录的开始位置(0表示第一条记录)
* @param int end 记录的结束位置(如果为-1则表示最后一个,-2,-3以此类推)
* @return 执行状态码
* */
public String ltrim(String key, int start, int end) {
return ltrim(SafeEncoder.encode(key), start, end);
}
} }
redis相关配置信息(spring-redis.xml):配置redis信息,连接池,工具类等:
<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-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<!-- Redis连接池配置 -->
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<!-- 控制一个pool能分配多少个jedis实例 -->
<property name="maxTotal" value="${redis.pool.maxActive}" />
<!-- 连接池中最多空闲多少个maxIdle个连接,这里为20,表示即使没有数据库连接时依然可以保持20空闲的连接,而不被清除,处于待命状态,随时连接 -->
<property name="maxIdle" value="${redis.pool.maxIdle}" />
<!-- 最大等待时间,当没有可用连接时,连接池等待连接被归还的最大时间(以毫秒计数),超过时间即抛出异常 -->
<property name="maxWaitMillis" value="${redis.pool.maxWait}" />
<!-- 在获取连接时,检查有效性 -->
<property name="testOnBorrow" value="${redis.pool.testOnBorrow}" />
</bean>
<!-- 创建Redis连接池,并做相关配置 -->
<bean id="jedisWritePool" class="com.swpu.o2o.cache.JedisPoolWriper"
depends-on="jedisPoolConfig">
<constructor-arg index="0" ref="jedisPoolConfig" />
<constructor-arg index="1" value="${redis.hostname}" />
<constructor-arg index="2" value="${redis.port}" type="int" />
</bean>
<!-- 创建Redis工具类,封装好Redis的连接以进行相关操作 -->
<bean id="jedisUtil" class="com.swpu.o2o.cache.JedisUtil"
scope="singleton">
<property name="jedisPool">
<ref bean="jedisWritePool" />
</property>
</bean>
<bean id="jedisKeys" class="com.swpu.o2o.cache.JedisUtil$Keys"
scope="singleton">
<constructor-arg ref="jedisUtil"></constructor-arg>
</bean>
<bean id="jedisStrings" class="com.swpu.o2o.cache.JedisUtil$Strings"
scope="singleton">
<constructor-arg ref="jedisUtil"></constructor-arg>
</bean>
<bean id="jedisLists" class="com.swpu.o2o.cache.JedisUtil$Lists"
scope="singleton">
<constructor-arg ref="jedisUtil"></constructor-arg>
</bean>
<bean id="jedisSets" class="com.swpu.o2o.cache.JedisUtil$Sets"
scope="singleton">
<constructor-arg ref="jedisUtil"></constructor-arg>
</bean>
<bean id="jedisHash" class="com.swpu.o2o.cache.JedisUtil$Hash"
scope="singleton">
<constructor-arg ref="jedisUtil"></constructor-arg>
</bean> </beans>
三.redis的使用
1.redis缓存相应数据例子(简单实现,未设置过期时间):
1.1redis缓存地区列表信息(Service):
package com.swpu.o2o.service.impl; import java.io.IOException;
import java.util.ArrayList;
import java.util.List; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional; import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.swpu.o2o.cache.JedisUtil;
import com.swpu.o2o.dao.AreaDao;
import com.swpu.o2o.entity.Area;
import com.swpu.o2o.exceptions.AreaOperationException;
import com.swpu.o2o.service.AreaService; @Service
@Transactional
public class AreaSeriviceImpl implements AreaService{
@Autowired
private AreaDao areaDao;
@Autowired
//redis键对象
private JedisUtil.Keys jedisKeys;
@Autowired
//redis字符串对象
private JedisUtil.Strings jedisStrings;
//区域信息key
private static String AREALISTKEY="arealist";
//日志
private Logger logger=LoggerFactory.getLogger(AreaSeriviceImpl.class);
@Override
public List<Area> getAreaList() {
String key=AREALISTKEY;
List<Area> areaList=null;
ObjectMapper mapper=new ObjectMapper();
if(!jedisKeys.exists(key)){
areaList=areaDao.queryArea();
String jsonString;
try {
//转换为字符串
jsonString = mapper.writeValueAsString(areaList);
} catch (JsonProcessingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
}
//设置对应键值(字符串)
jedisStrings.set(key, jsonString); }
else{
//获取对应值
String jsonString=jedisStrings.get(key);
JavaType javaType=mapper.getTypeFactory().constructParametricType(ArrayList.class, Area.class);
try {
//获取为对应对象
areaList=mapper.readValue(jsonString, javaType);
} catch (JsonParseException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
} catch (JsonMappingException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
} catch (IOException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
}
}
return areaList;
} }
1.2redis缓存轮播图信息(Service):
package com.swpu.o2o.service.impl; import java.io.IOException;
import java.util.ArrayList;
import java.util.List; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.swpu.o2o.cache.JedisUtil;
import com.swpu.o2o.dao.HeadLineDao;
import com.swpu.o2o.entity.HeadLine;
import com.swpu.o2o.exceptions.AreaOperationException;
import com.swpu.o2o.service.HeadLineService; @Service
public class HeadLineServiceImpl implements HeadLineService{
@Autowired
private HeadLineDao headLineDao;
@Autowired
private JedisUtil.Keys jedisKeys;
@Autowired
private JedisUtil.Strings jedisStrings;
//头条缓存中对应的键
private static String HEADLISTKEY="headlist";
private Logger logger=LoggerFactory.getLogger(HeadLineServiceImpl.class); @Override
public List<HeadLine> getHeadLineList(HeadLine headLineCondition) throws IOException {
String key=HEADLISTKEY;
List<HeadLine> headlist=null;
//定义jackson数据转换操作类
ObjectMapper mapper=new ObjectMapper();
//拼接redis的key(轮播图有两种状态:0【禁用】和1【可用】)
if(headLineCondition!=null&&headLineCondition.getEnableStatus()!=null){
key=key+"_"+headLineCondition.getEnableStatus();
}
//判断key是否存在
if(!jedisKeys.exists(key)){
//不存在,则调用Dao层从mysql取出相应数据
headlist=headLineDao.queryHeadLine(headLineCondition);
//将相关实体类集合转换为string,存入redis里面对应的key中
String jsonString;
try {
//转换为字符串
jsonString = mapper.writeValueAsString(headlist);
} catch (JsonProcessingException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
}
jedisStrings.set(key, jsonString); }
else{
//该key存在,直接从redis将数据取出
String jsonString=jedisStrings.get(key);
//指定要将将string转换为相应的集合类型
JavaType javaType=mapper.getTypeFactory().constructParametricType(ArrayList.class, HeadLine.class);
try {
//将相关key对应的值string取出来转换为相应的对象的实体类集合
headlist=mapper.readValue(jsonString, javaType);
} catch (JsonParseException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
} catch (JsonMappingException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
} catch (IOException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new AreaOperationException(e.getMessage());
}
}
return headlist;
} }
1.3redis缓存商品类别信息(Service):
package com.swpu.o2o.service.impl; import java.io.IOException;
import java.util.List; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.swpu.o2o.cache.JedisUtil;
import com.swpu.o2o.dao.ShopCategoryDao;
import com.swpu.o2o.entity.ShopCategory;
import com.swpu.o2o.exceptions.ShopOperationException;
import com.swpu.o2o.service.ShopCategoryService; @Service
public class ShopCategoryServiceImpl implements ShopCategoryService {
@Autowired
private ShopCategoryDao shopCategoryDao;
@Autowired
private JedisUtil.Keys jedisKeys;
@Autowired
private JedisUtil.Strings jedisStrings; private static String SCLISTKEY = "shopcategorylist";
private static Logger logger = LoggerFactory.getLogger(ShopCategoryServiceImpl.class); @Override
public List<ShopCategory> getShopCategoeyList(ShopCategory shopCategoryCondition) {
// 定义redis的key前缀
String key = SCLISTKEY;
// 定义接收对象
List<ShopCategory> shopCategoryList = null;
// 定义jackson数据转换操作类
ObjectMapper mapper = new ObjectMapper();
// 拼接出redis的key
if (shopCategoryCondition == null) {
// 若查询条件为空,则列出所有首页大类,即parentId为空的店铺类别
key = key + "_allfirstlevel";
} else if (shopCategoryCondition != null && shopCategoryCondition.getParent() != null
&& shopCategoryCondition.getParent().getShopCategoryId() != null) {
//若parentId不为空,则列出所有该parentId下的所有子类别
key=key+"_parent"+shopCategoryCondition.getParent().getShopCategoryId(); }
else if(shopCategoryCondition!=null){
//列出所有子类别,不管属于哪个类,都列出来
key=key+"_allsecendlevel";
}
//判断key是否存在
if(!jedisKeys.exists(key)){
//若不存在,则从数据库中取出相应数据
shopCategoryList=shopCategoryDao.queryShopCategory(shopCategoryCondition);
//将相关的实体类集合转换成string,存入redis里面对应的key
String jsonString;
try{
jsonString=mapper.writeValueAsString(shopCategoryList);
}
catch(JsonProcessingException e){
e.printStackTrace();
logger.error(e.getMessage());
throw new ShopOperationException(e.getMessage()); }
jedisStrings.set(key, jsonString); }
else{
//键存在
String jsonString=jedisStrings.get(key);
//指定要将值转换为的集合类型
JavaType javaType=mapper.getTypeFactory().constructParametricType(String.class, ShopCategory.class);
try {
//将相关key中的value里的String类型转换为对象的实体类集合
shopCategoryList=mapper.readValue(jsonString, javaType);
} catch (JsonParseException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new ShopOperationException(e.getMessage());
} catch (JsonMappingException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new ShopOperationException(e.getMessage());
} catch (IOException e) {
e.printStackTrace();
logger.error(e.getMessage());
throw new ShopOperationException(e.getMessage());
}
}
return shopCategoryList;
} }
注意:
1.连接时需要检查redis是否可用,如果需要远程连接(注意是否绑定了IP,是则注销或者将IP修改为0.0.0.0),需要修改redis配置文件将保护状态(protected-mode修改为no),然后重启;
2.注意redis的key不能重复,否则值会覆盖。
2.删除相应键值对(把键移动到service接口中,便于使用):
2.1定义缓存删除接口:
package com.swpu.o2o.service; public interface CacheService {
/**
* 根据key前缀删除匹配该模式下的所有key-value(如shopcategory,则以该字符串开头的所有键值都会删除)
* @param keyPrefix
*/
void removeFromCatche(String keyPrefix); }
2.2实现缓存删除接口:
package com.swpu.o2o.service.impl; import java.util.Set; import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import com.swpu.o2o.cache.JedisUtil;
import com.swpu.o2o.service.CacheService; @Service
public class CacheServiceImpl implements CacheService {
// 定义操作key的对象
@Autowired
private JedisUtil.Keys jedisKeys; @Override
public void removeFromCatche(String keyPrefix) {
// 匹配获取所有以字符串keyPrefix开头的键的集合
Set<String> keySet = jedisKeys.keys(keyPrefix + "*");
for (String key : keySet) {
// 遍历删除集合中对应键
jedisKeys.del(key);
}
} }