实战SSM_O2O商铺_45【Redis缓存】配置Redis在Service层加入缓存
2024-03-23 14:44:41
文章目录
- 概述
- Windows下安装Redis
- O2O-Service层加入缓存的配置步骤
- 1. pom.xml 添加jedis依赖包
- 2. redis配置文件
- 3.spring-dao.xml加载redis.properties
- 4.封装JedisPool,用于创建JedisPool
- 5.封装操作redis的工具类 JedisUtil
- 6.新建spring-redis.xml 配置redis连接池和bean
- 7. web.xml中加载spring-redis.xml
- 8.Service层使用缓存
- 9.单元测试
- 9.1 BaseTest基类中加载 classpath:spring-redis.xml
- 9.2 debug调测
- 10 Redis中验证数据
- Github地址
概述
Redis 是一个高性能的key-value数据库。
Redis性能十分优越，可以支持每秒十几万次的读／写操作，其性能远超数据库，并且支持集群、分布式、主从同步等配置，原则上可以无限扩展，让更多的数据存储在内存中，它还能支持一定的事务能力，这在高并发访问的场景下保证数据安全和一致性特别有用。
Windows下安装Redis
我这里的是windows的操作系统，下载地址：
https://github.com/ServiceStack/redis-windows/tree/master/downloads
下载最新版本
解压即可，为了方便启动，在解压后的目录下新建一个文件 startup.cmd，内容如下
redis-server redis.windows.conf
该命令是调用 redis-server.exe 的命令读取 redis.window.conf 的内容，用来启动 redis,后面双击startup.cmd就可以看到 如下Redis 启动的信息了.
可以双击放在同一个文件夹下的文件redis -cli .exe ，它是一个 Redis 自带的客户端工具，这样就可以连接到 Redis 服务器. 通常我们使用第三方的客户端，比如RedisDesktopManager
O2O-Service层加入缓存的配置步骤
1. pom.xml 添加jedis依赖包
在 Java 中使用 Redis 工具 ， 要先下载 jedis.Jar 包，把它加载到工程的路径中，首先去maven仓库中查找 http://mvnrepository.com/artifact/redis.clients/jedis
<!-- redis客户端:Jedis --><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.9.0</version></dependency>
我们没有使用Spring提供的RedisTemplate 所以 这里没有添加spring-data-redis.jar
2. redis配置文件
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
3.spring-dao.xml加载redis.properties
<bean class="com.artisan.o2o.util.EncryptPropertyPlaceholderConfigurer"><property name="locations"><list><value>classpath:jdbc.properties</value><value>classpath:redis.properties</value></list></property><property name="fileEncoding" value="UTF-8"/></bean>
4.封装JedisPool,用于创建JedisPool
package com.artisan.o2o.cache;import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;/*** * * @ClassName: JedisPoolWriper* * @Description: 强指定redis的JedisPool接口构造函数，创建jedispool* * @author: Mr.Yang* * @date: 2018年8月10日 上午10:45:51*/
public class JedisPoolWriper {private JedisPool jedisPool;/*** * * @Title:JedisPoolWriper* * @Description:构造函数* * @param poolConfig* @param host* @param port*/public JedisPoolWriper(final JedisPoolConfig poolConfig, final String host,final int port) {try {jedisPool = new JedisPool(poolConfig, host, port);} catch (Exception e) {e.printStackTrace();}}public JedisPool getJedisPool() {return jedisPool;}public void setJedisPool(JedisPool jedisPool) {this.jedisPool = jedisPool;}}5.封装操作redis的工具类 JedisUtil
package com.artisan.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* * @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* * @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);}}}
6.新建spring-redis.xml 配置redis连接池和bean
<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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"><!-- redis连接池设置 --><bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig"><!-- 控制一个pool 可以分配多少个jedis实例 --><property name="maxTotal" value="${redis.pool.maxActive}" /><!-- 连接池中最多可空闲 maxIdle个连接，假设设置为20，表示即使没有数据库连接依然保持20个空闲连接，随时处于待命状态--><property name="maxIdle" value="${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（单位为毫秒）,超时则抛出异常 --><property name="maxWaitMillis" value="${redis.pool.maxWait}" /><!-- 在获取连接时，检查连接有效性 --><property name="testOnBorrow" value="${redis.pool.testOnBorrow}" /></bean><!-- 创建redis连接池，并做相关配置 --><bean id="jedisWritePool" class="com.artisan.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的工具类，封装好Redis的连接以进行相关的操作 --><bean id="jedisUtil" class="com.artisan.o2o.cache.JedisUtil"scope="singleton"><property name="jedisPool"><ref bean="jedisWritePool" /></property></bean><bean id="jedisKeys" class="com.artisan.o2o.cache.JedisUtil$Keys"scope="singleton"><constructor-arg ref="jedisUtil"></constructor-arg></bean><bean id="jedisStrings" class="com.artisan.o2o.cache.JedisUtil$Strings"scope="singleton"><constructor-arg ref="jedisUtil"></constructor-arg></bean><bean id="jedisLists" class="com.artisan.o2o.cache.JedisUtil$Lists"scope="singleton"><constructor-arg ref="jedisUtil"></constructor-arg></bean><bean id="jedisSets" class="com.artisan.o2o.cache.JedisUtil$Sets"scope="singleton"><constructor-arg ref="jedisUtil"></constructor-arg></bean><bean id="jedisHash" class="com.artisan.o2o.cache.JedisUtil$Hash"scope="singleton"><constructor-arg ref="jedisUtil"></constructor-arg></bean></beans>
7. web.xml中加载spring-redis.xml
检查下即可
8.Service层使用缓存
首先从缓存中取，如果缓存中不存在则去DB中获取然后更新到缓存中，下次直接从缓存中获取。
package com.artisan.o2o.service.impl;import java.io.IOException;
import java.util.ArrayList;
import java.util.List;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.artisan.o2o.cache.JedisUtil;
import com.artisan.o2o.dao.AreaDao;
import com.artisan.o2o.entity.Area;
import com.artisan.o2o.service.AreaService;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;/*** * * @ClassName: AreaServiceImpl* * @Description: @Service标注的服务层* * @author: Mr.Yang* * @date: 2018年5月14日 下午9:06:45*/
@Service
public class AreaServiceImpl implements AreaService {@AutowiredAreaDao areaDao;@Autowiredprivate JedisUtil.Strings jedisStrings;@Autowiredprivate JedisUtil.Keys jedisKeys;private static String AREALISTKEY = "arealist";@Overridepublic List<Area> getAreaList() throws JsonParseException, JsonMappingException, IOException {// 定义redis中的keyString key = AREALISTKEY;// 定义接收对象List<Area> areaList = null;// 定义jackson数据转换操作类ObjectMapper mapper = new ObjectMapper();// 判断key是否存在if (!jedisKeys.exists(key)) {areaList = areaDao.queryArea();String jsonString = mapper.writeValueAsString(areaList);jedisStrings.set(key, jsonString);} else {String jsonString = jedisStrings.get(key);JavaType javaType = mapper.getTypeFactory().constructParametricType(ArrayList.class, Area.class);areaList = mapper.readValue(jsonString, javaType);}return areaList;}}9.单元测试
9.1 BaseTest基类中加载 classpath:spring-redis.xml
package com.artisan.o2o;import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;/*** * * @ClassName: BaseTest* * @Description: 测试类的基类,配置Spring和junit整合,junit启动时加载springIOC容器* * @author: Mr.Yang* * @date: 2018年5月14日 下午12:58:21*/@RunWith(SpringJUnit4ClassRunner.class)
// 告诉junit spring配置文件
@ContextConfiguration({ "classpath:spring/spring-dao.xml", "classpath:spring-service.xml", "classpath:spring-redis.xml" })
public class BaseTest {}
9.2 debug调测
package com.artisan.o2o.service;import java.io.IOException;
import java.util.List;import org.junit.Assert;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;import com.artisan.o2o.BaseTest;
import com.artisan.o2o.entity.Area;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;public class AreaServiceTest extends BaseTest {@AutowiredAreaService areaService;@Testpublic void testGetAreaList() throws JsonParseException, JsonMappingException, IOException {List<Area> areaList = areaService.getAreaList();Assert.assertEquals("北京", areaList.get(0).getAreaName());}
}getAreaList方法中加入断点，逐步调测。 测试两次，第一次从db中获取，第二次从redis中读取. 单元测试通过
10 Redis中验证数据
自带客户端 get arealist
第三方客户端
Github地址
代码地址： https://github.com/yangshangwei/o2o
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