- Jredis:https://github.com/alphazero/jredis
- Jedis:https://github.com/xetorthio/jedis
- Redis4J:https://github.com/guming/redis4j
Jedis是官方提供的唯一Redis Client For Java Provider。
- <dependency>
- <groupId>redis.clients</groupId>
- <artifactId>jedis</artifactId>
- <version>2.6.2</version>
- </dependency>
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.6.2</version> </dependency>
一、Jedis简单使用
- package cn.slimsmart.redis.demo.jedis;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import java.util.Set;
- import redis.clients.jedis.Jedis;
- @SuppressWarnings(“resource”)
- public class JedisTest {
- private static final String HASH_KEY = “key”;
- public static void main(String[] args) {
- Jedis jedis = new Jedis(“192.168.36.189”, 6379);
- /**
- * 存储String key-value
- */
- jedis.set(HASH_KEY, ”value”);
- /**
- * 如果已经存在key了,先删除掉
- */
- if (jedis.exists(HASH_KEY)) {
- System.out.println(jedis.get(HASH_KEY));
- jedis.del(HASH_KEY);
- }
- /**
- * 存入单个key-value
- */
- jedis.hset(HASH_KEY, ”username”, “yourUsername”);
- /**
- * 存入多个key-value键值对
- */
- Map<String, String> keyValueMap = new HashMap<String, String>();
- keyValueMap.put(”password”, “YourPassword”);
- keyValueMap.put(”age”, “20”);
- jedis.hmset(HASH_KEY, keyValueMap);
- /**
- * 判断某个key是否在指定的Hash key中
- */
- boolean existsUsernameKey = jedis.hexists(HASH_KEY, “username”);
- // true
- System.out.println(existsUsernameKey);
- /**
- * 获取某个hash中键值对的数量
- */
- Long len = jedis.hlen(HASH_KEY);
- // 3
- System.out.println(len);
- /**
- * 获取一个hash中的所有key
- */
- Set<String> keys = jedis.hkeys(HASH_KEY);
- // [password, username, age]
- System.out.println(keys);
- /**
- * 获取一个hash中的所有values
- */
- List<String> values = jedis.hvals(HASH_KEY);
- // [yourUsername, YourPassword, 20]
- System.out.println(values);
- /**
- * 获取指定hash的所有的键值对
- */
- Map<String, String> allKVMap = jedis.hgetAll(HASH_KEY);
- // {username=yourUsername, age=20, password=YourPassword}
- System.out.println(allKVMap);
- /**
- * 从一个hash中获取某个field的值
- */
- String value = jedis.hget(HASH_KEY, ”username”);
- // yourUsername
- System.out.println(value);
- List<String> multValues = jedis.hmget(HASH_KEY, ”username”, “password”);
- // [yourUsername, YourPassword]
- System.out.println(multValues);
- }
- }
package cn.slimsmart.redis.demo.jedis; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import redis.clients.jedis.Jedis; @SuppressWarnings("resource") public class JedisTest { private static final String HASH_KEY = "key"; public static void main(String[] args) { Jedis jedis = new Jedis("192.168.36.189", 6379); /** * 存储String key-value */ jedis.set(HASH_KEY, "value"); /** * 如果已经存在key了,先删除掉 */ if (jedis.exists(HASH_KEY)) { System.out.println(jedis.get(HASH_KEY)); jedis.del(HASH_KEY); } /** * 存入单个key-value */ jedis.hset(HASH_KEY, "username", "yourUsername"); /** * 存入多个key-value键值对 */ Map<String, String> keyValueMap = new HashMap<String, String>(); keyValueMap.put("password", "YourPassword"); keyValueMap.put("age", "20"); jedis.hmset(HASH_KEY, keyValueMap); /** * 判断某个key是否在指定的Hash key中 */ boolean existsUsernameKey = jedis.hexists(HASH_KEY, "username"); // true System.out.println(existsUsernameKey); /** * 获取某个hash中键值对的数量 */ Long len = jedis.hlen(HASH_KEY); // 3 System.out.println(len); /** * 获取一个hash中的所有key */ Set<String> keys = jedis.hkeys(HASH_KEY); // [password, username, age] System.out.println(keys); /** * 获取一个hash中的所有values */ List<String> values = jedis.hvals(HASH_KEY); // [yourUsername, YourPassword, 20] System.out.println(values); /** * 获取指定hash的所有的键值对 */ Map<String, String> allKVMap = jedis.hgetAll(HASH_KEY); // {username=yourUsername, age=20, password=YourPassword} System.out.println(allKVMap); /** * 从一个hash中获取某个field的值 */ String value = jedis.hget(HASH_KEY, "username"); // yourUsername System.out.println(value); List<String> multValues = jedis.hmget(HASH_KEY, "username", "password"); // [yourUsername, YourPassword] System.out.println(multValues); } }二、连接池的使用
Jedis使用commons-pool完成池化实现。
1.配置文件redis.properties
- redis.pool.maxTotal=10
- redis.pool.minIdle=2
- redis.pool.maxIdle=10
- redis.pool.maxWait=1000
- redis.pool.testWhileIdle=true
- redis.pool.testOnBorrow=true
- redis.pool.testOnReturn=true
- #IP
- redis.ip=192.168.36.189
- #Port
- redis.port=6379
redis.pool.maxTotal=10 redis.pool.minIdle=2 redis.pool.maxIdle=10 redis.pool.maxWait=1000 redis.pool.testWhileIdle=true redis.pool.testOnBorrow=true redis.pool.testOnReturn=true
IP
redis.ip=192.168.36.189
Port
redis.port=63792.实例代码
- package cn.slimsmart.redis.demo.jedis;
- import java.util.ResourceBundle;
- import redis.clients.jedis.Jedis;
- import redis.clients.jedis.JedisPool;
- import redis.clients.jedis.JedisPoolConfig;
- public class JedisPoolTest {
- public static void main(String[] args) {
- ResourceBundle bundle = ResourceBundle.getBundle(”redis”);
- if (bundle == null) {
- throw new IllegalArgumentException(“[redis.properties] is not found!”);
- }
- JedisPoolConfig config = new JedisPoolConfig();
- config.setMaxTotal(Integer.valueOf(bundle.getString(”redis.pool.maxTotal”)));
- config.setMinIdle(Integer.valueOf(bundle.getString(”redis.pool.minIdle”)));
- config.setMaxIdle(Integer.valueOf(bundle.getString(”redis.pool.maxIdle”)));
- config.setMaxWaitMillis(Long.valueOf(bundle.getString(”redis.pool.maxWait”)));
- config.setTestWhileIdle(Boolean.valueOf(bundle.getString(”redis.pool.testWhileIdle”)));
- config.setTestOnBorrow(Boolean.valueOf(bundle.getString(”redis.pool.testOnBorrow”)));
- config.setTestOnReturn(Boolean.valueOf(bundle.getString(”redis.pool.testOnReturn”)));
- JedisPool pool = new JedisPool(config, bundle.getString(“redis.ip”), Integer.valueOf(bundle.getString(“redis.port”)));
- // 从池中获取一个Jedis对象
- Jedis jedis = pool.getResource();
- String key = ”key”;
- // 删数据
- jedis.del(key);
- // 存数据
- jedis.set(key, ”abc123”);
- // 取数据
- String value = jedis.get(key);
- System.out.println(value);
- // 释放对象池
- pool.returnResource(jedis);
- }
- }
package cn.slimsmart.redis.demo.jedis; import java.util.ResourceBundle; import redis.clients.jedis.Jedis; import redis.clients.jedis.JedisPool; import redis.clients.jedis.JedisPoolConfig; public class JedisPoolTest { public static void main(String[] args) { ResourceBundle bundle = ResourceBundle.getBundle("redis"); if (bundle == null) { throw new IllegalArgumentException("[redis.properties] is not found!"); } JedisPoolConfig config = new JedisPoolConfig(); config.setMaxTotal(Integer.valueOf(bundle.getString("redis.pool.maxTotal"))); config.setMinIdle(Integer.valueOf(bundle.getString("redis.pool.minIdle"))); config.setMaxIdle(Integer.valueOf(bundle.getString("redis.pool.maxIdle"))); config.setMaxWaitMillis(Long.valueOf(bundle.getString("redis.pool.maxWait"))); config.setTestWhileIdle(Boolean.valueOf(bundle.getString("redis.pool.testWhileIdle"))); config.setTestOnBorrow(Boolean.valueOf(bundle.getString("redis.pool.testOnBorrow"))); config.setTestOnReturn(Boolean.valueOf(bundle.getString("redis.pool.testOnReturn"))); JedisPool pool = new JedisPool(config, bundle.getString("redis.ip"), Integer.valueOf(bundle.getString("redis.port"))); // 从池中获取一个Jedis对象 Jedis jedis = pool.getResource(); String key = "key"; // 删数据 jedis.del(key); // 存数据 jedis.set(key, "abc123"); // 取数据 String value = jedis.get(key); System.out.println(value); // 释放对象池 pool.returnResource(jedis); } }三、一致性哈希
Memcached完全基于分布式集群,而Redis是Master-Slave,如果想把Reids,做成集群模式,无外乎多做几套Master-Slave,每套Master-Slave完成各自的容灾处理,通过Client工具,完成一致性哈希。Memcached是在Server端完成Sharding,Redis只能依靠各个Client做Sharding。在Redis 3.0系列支持Server端Sharding。
shared一致性哈希采用以下方案:
1.Redis服务器节点划分:将每台服务器节点采用hash算法划分为160个虚拟节点(可以配置划分权重)
2.将划分虚拟节点采用TreeMap存储
3.对每个Redis服务器的物理连接采用LinkedHashMap存储
4.对Key采用同样的hash算法,然后从TreeMap获取大于等于键hash值得节点,取最邻近节点存储;当key的hash值大于虚拟节点hash值得最大值时,存入第一个虚拟节点
sharded采用的hash算法:MD5和MurmurHash两种;默认采用64位的MurmurHash算法。
1.配置文件redis.properties
- redis.pool.maxTotal=10
- redis.pool.minIdle=2
- redis.pool.maxIdle=10
- redis.pool.maxWait=1000
- redis.pool.testWhileIdle=true
- redis.pool.testOnBorrow=true
- redis.pool.testOnReturn=true
- #IP
- redis1.ip=192.168.36.189
- redis2.ip=192.168.36.54
- #Port
- redis.port=6379
redis.pool.maxTotal=10 redis.pool.minIdle=2 redis.pool.maxIdle=10 redis.pool.maxWait=1000 redis.pool.testWhileIdle=true redis.pool.testOnBorrow=true redis.pool.testOnReturn=true
IP
redis1.ip=192.168.36.189
redis2.ip=192.168.36.54
Port
redis.port=6379
2.实例代码
- package cn.slimsmart.redis.demo.jedis;
- import java.util.LinkedList;
- import java.util.List;
- import java.util.ResourceBundle;
- import redis.clients.jedis.JedisPoolConfig;
- import redis.clients.jedis.JedisShardInfo;
- import redis.clients.jedis.ShardedJedis;
- import redis.clients.jedis.ShardedJedisPool;
- public class JedisShardInfoTest {
- public static void main(String[] args) {
- ResourceBundle bundle = ResourceBundle.getBundle(”redis”);
- if (bundle == null) {
- throw new IllegalArgumentException(“[redis.properties] is not found!”);
- }
- JedisPoolConfig config = new JedisPoolConfig();
- config.setMaxTotal(Integer.valueOf(bundle.getString(”redis.pool.maxTotal”)));
- config.setMinIdle(Integer.valueOf(bundle.getString(”redis.pool.minIdle”)));
- config.setMaxIdle(Integer.valueOf(bundle.getString(”redis.pool.maxIdle”)));
- config.setMaxWaitMillis(Long.valueOf(bundle.getString(”redis.pool.maxWait”)));
- config.setTestWhileIdle(Boolean.valueOf(bundle.getString(”redis.pool.testWhileIdle”)));
- config.setTestOnBorrow(Boolean.valueOf(bundle.getString(”redis.pool.testOnBorrow”)));
- config.setTestOnReturn(Boolean.valueOf(bundle.getString(”redis.pool.testOnReturn”)));
- JedisShardInfo jedisShardInfo1 = new JedisShardInfo(bundle.getString(“redis1.ip”), Integer.valueOf(bundle.getString(“redis.port”)));
- JedisShardInfo jedisShardInfo2 = new JedisShardInfo(bundle.getString(“redis2.ip”), Integer.valueOf(bundle.getString(“redis.port”)));
- List<JedisShardInfo> list = new LinkedList<JedisShardInfo>();
- list.add(jedisShardInfo1);
- list.add(jedisShardInfo2);
- // 初始化ShardedJedisPool代替JedisPool
- ShardedJedisPool pool = new ShardedJedisPool(config, list);
- // 从池中获取一个Jedis对象
- ShardedJedis jedis = pool.getResource();
- String keys = ”key”;
- String value = ”abc123”;
- // 删数据
- jedis.del(keys);
- // 存数据
- jedis.set(keys, value);
- // 取数据
- String v = jedis.get(keys);
- System.out.println(v);
- // 释放对象池
- pool.returnResource(jedis);
- }
- }
package cn.slimsmart.redis.demo.jedis;
import java.util.LinkedList;
import java.util.List;
import java.util.ResourceBundle;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisShardInfo;
import redis.clients.jedis.ShardedJedis;
import redis.clients.jedis.ShardedJedisPool;
public class JedisShardInfoTest {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("redis");
if (bundle == null) {
throw new IllegalArgumentException("[redis.properties] is not found!");
}
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(Integer.valueOf(bundle.getString("redis.pool.maxTotal")));
config.setMinIdle(Integer.valueOf(bundle.getString("redis.pool.minIdle")));
config.setMaxIdle(Integer.valueOf(bundle.getString("redis.pool.maxIdle")));
config.setMaxWaitMillis(Long.valueOf(bundle.getString("redis.pool.maxWait")));
config.setTestWhileIdle(Boolean.valueOf(bundle.getString("redis.pool.testWhileIdle")));
config.setTestOnBorrow(Boolean.valueOf(bundle.getString("redis.pool.testOnBorrow")));
config.setTestOnReturn(Boolean.valueOf(bundle.getString("redis.pool.testOnReturn")));
JedisShardInfo jedisShardInfo1 = new JedisShardInfo(bundle.getString("redis1.ip"), Integer.valueOf(bundle.getString("redis.port")));
JedisShardInfo jedisShardInfo2 = new JedisShardInfo(bundle.getString("redis2.ip"), Integer.valueOf(bundle.getString("redis.port")));
List<JedisShardInfo> list = new LinkedList<JedisShardInfo>();
list.add(jedisShardInfo1);
list.add(jedisShardInfo2);
// 初始化ShardedJedisPool代替JedisPool
ShardedJedisPool pool = new ShardedJedisPool(config, list);
// 从池中获取一个Jedis对象
ShardedJedis jedis = pool.getResource();
String keys = "key";
String value = "abc123";
// 删数据
jedis.del(keys);
// 存数据
jedis.set(keys, value);
// 取数据
String v = jedis.get(keys);
System.out.println(v);
// 释放对象池
pool.returnResource(jedis);
}
}
通过以上方式,向redis进行set操作的key-value,会通过hash而均匀的分配到pool里的redis机器中。
四、Spring集成
如果有必要,可以用Spring封装初始化。
- <context:property-placeholder location=“classpath:redis.properties” />
- <bean
- id=“jedisPoolConfig”
- class=“redis.clients.jedis.JedisPoolConfig”>
- <property
- name=“maxTotal”
- value=“ {redis.pool.minIdle}” />
- <property
- name=“maxIdle”
- value=“ {redis.pool.maxWait}” />
- <property
- name=“testWhileIdle”
- value=“ {redis.pool.testOnBorrow}” />
- <property
- name=“testOnReturn”
- value=“ {redis1.ip}” />
- <constructor-arg
- index=“1”
- value=“ {redis2.ip}” />
- <constructor-arg
- index=“1”
- value=“${redis.port}”
- type=“int” />
- </bean>
- </list>
- </constructor-arg>
- </bean>
<context:property-placeholder location="classpath:redis.properties" />当然,Spring提供了对于Redis的专门支持: spring-data-redis。
<bean
id="jedisPoolConfig"
class="redis.clients.jedis.JedisPoolConfig">
<property
name="maxTotal"
value="${redis.pool.maxTotal}" />
<property
name="minIdle"
value="${redis.pool.minIdle}" />
<property
name="maxIdle"
value="${redis.pool.maxIdle}" />
<property
name="maxWait"
value="${redis.pool.maxWait}" />
<property
name="testWhileIdle"
value="${redis.pool.testWhileIdle}" />
<property
name="testOnBorrow"
value="${redis.pool.testOnBorrow}" />
<property
name="testOnReturn"
value="${redis.pool.testOnReturn}" />
</bean>
<bean
id="shardedJedisPool"
class="redis.clients.jedis.ShardedJedisPool">
<constructor-arg
index="0"
ref="jedisPoolConfig" />
<constructor-arg index="1">
<list>
<bean class="redis.clients.jedis.JedisShardInfo">
<constructor-arg
index="0"
value="${redis1.ip}" />
<constructor-arg
index="1"
value="${redis.port}"
type="int" />
</bean>
<bean class="redis.clients.jedis.JedisShardInfo">
<constructor-arg
index="0"
value="${redis2.ip}" />
<constructor-arg
index="1"
value="${redis.port}"
type="int" />
</bean>
</list>
</constructor-arg>
</bean>
- Jredis:https://github.com/alphazero/jredis
- Jedis:https://github.com/xetorthio/jedis
- Redis4J:https://github.com/guming/redis4j
Jedis是官方提供的唯一Redis Client For Java Provider。
- <dependency>
- <groupId>redis.clients</groupId>
- <artifactId>jedis</artifactId>
- <version>2.6.2</version>
- </dependency>
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.6.2</version> </dependency>
一、Jedis简单使用
- package cn.slimsmart.redis.demo.jedis;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import java.util.Set;
- import redis.clients.jedis.Jedis;
- @SuppressWarnings(“resource”)
- public class JedisTest {
- private static final String HASH_KEY = “key”;
- public static void main(String[] args) {
- Jedis jedis = new Jedis(“192.168.36.189”, 6379);
- /**
- * 存储String key-value
- */
- jedis.set(HASH_KEY, ”value”);
- /**
- * 如果已经存在key了,先删除掉
- */
- if (jedis.exists(HASH_KEY)) {
- System.out.println(jedis.get(HASH_KEY));
- jedis.del(HASH_KEY);
- }
- /**
- * 存入单个key-value
- */
- jedis.hset(HASH_KEY, ”username”, “yourUsername”);
- /**
- * 存入多个key-value键值对
- */
- Map<String, String> keyValueMap = new HashMap<String, String>();
- keyValueMap.put(”password”, “YourPassword”);
- keyValueMap.put(”age”, “20”);
- jedis.hmset(HASH_KEY, keyValueMap);
- /**
- * 判断某个key是否在指定的Hash key中
- */
- boolean existsUsernameKey = jedis.hexists(HASH_KEY, “username”);
- // true
- System.out.println(existsUsernameKey);
- /**
- * 获取某个hash中键值对的数量
- */
- Long len = jedis.hlen(HASH_KEY);
- // 3
- System.out.println(len);
- /**
- * 获取一个hash中的所有key
- */
- Set<String> keys = jedis.hkeys(HASH_KEY);
- // [password, username, age]
- System.out.println(keys);
- /**
- * 获取一个hash中的所有values
- */
- List<String> values = jedis.hvals(HASH_KEY);
- // [yourUsername, YourPassword, 20]
- System.out.println(values);
- /**
- * 获取指定hash的所有的键值对
- */
- Map<String, String> allKVMap = jedis.hgetAll(HASH_KEY);
- // {username=yourUsername, age=20, password=YourPassword}
- System.out.println(allKVMap);
- /**
- * 从一个hash中获取某个field的值
- */
- String value = jedis.hget(HASH_KEY, ”username”);
- // yourUsername
- System.out.println(value);
- List<String> multValues = jedis.hmget(HASH_KEY, ”username”, “password”);
- // [yourUsername, YourPassword]
- System.out.println(multValues);
- }
- }
package cn.slimsmart.redis.demo.jedis; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import redis.clients.jedis.Jedis; @SuppressWarnings("resource") public class JedisTest { private static final String HASH_KEY = "key"; public static void main(String[] args) { Jedis jedis = new Jedis("192.168.36.189", 6379); /** * 存储String key-value */ jedis.set(HASH_KEY, "value"); /** * 如果已经存在key了,先删除掉 */ if (jedis.exists(HASH_KEY)) { System.out.println(jedis.get(HASH_KEY)); jedis.del(HASH_KEY); } /** * 存入单个key-value */ jedis.hset(HASH_KEY, "username", "yourUsername"); /** * 存入多个key-value键值对 */ Map<String, String> keyValueMap = new HashMap<String, String>(); keyValueMap.put("password", "YourPassword"); keyValueMap.put("age", "20"); jedis.hmset(HASH_KEY, keyValueMap); /** * 判断某个key是否在指定的Hash key中 */ boolean existsUsernameKey = jedis.hexists(HASH_KEY, "username"); // true System.out.println(existsUsernameKey); /** * 获取某个hash中键值对的数量 */ Long len = jedis.hlen(HASH_KEY); // 3 System.out.println(len); /** * 获取一个hash中的所有key */ Set<String> keys = jedis.hkeys(HASH_KEY); // [password, username, age] System.out.println(keys); /** * 获取一个hash中的所有values */ List<String> values = jedis.hvals(HASH_KEY); // [yourUsername, YourPassword, 20] System.out.println(values); /** * 获取指定hash的所有的键值对 */ Map<String, String> allKVMap = jedis.hgetAll(HASH_KEY); // {username=yourUsername, age=20, password=YourPassword} System.out.println(allKVMap); /** * 从一个hash中获取某个field的值 */ String value = jedis.hget(HASH_KEY, "username"); // yourUsername System.out.println(value); List<String> multValues = jedis.hmget(HASH_KEY, "username", "password"); // [yourUsername, YourPassword] System.out.println(multValues); } }二、连接池的使用
Jedis使用commons-pool完成池化实现。
1.配置文件redis.properties
- redis.pool.maxTotal=10
- redis.pool.minIdle=2
- redis.pool.maxIdle=10
- redis.pool.maxWait=1000
- redis.pool.testWhileIdle=true
- redis.pool.testOnBorrow=true
- redis.pool.testOnReturn=true
- #IP
- redis.ip=192.168.36.189
- #Port
- redis.port=6379
redis.pool.maxTotal=10 redis.pool.minIdle=2 redis.pool.maxIdle=10 redis.pool.maxWait=1000 redis.pool.testWhileIdle=true redis.pool.testOnBorrow=true redis.pool.testOnReturn=true