Redis --- Jedis 使用简单示例

Redis --- Jedis 使用简单示例

Jedis连接独立Redis

JedisPoolConfig config = new JedisPoolConfig();        config.setMaxTotal(100);        config.setMaxIdle(20);        config.setMaxWaitMillis(1000);        config.setTimeBetweenEvictionRunsMillis(60000);               JedisPool jedisPool = new JedisPool(config,               "192.168.89.131", 6379);                 Jedis jedis = jedisPool.getResource();               Iterator iter = jedis.keys("*").iterator();        while(iter.hasNext()){            System.out.println(iter.next());        }        jedis.close();        jedisPool.close();

 

 

Jedis 连接Sentinel

Sentinels的创建见《Redis ---Sentinel 》

Set sentinels = new HashSet();        sentinels.add("192.168.89.131:26379");        sentinels.add("192.168.89.131:27379");        sentinels.add("192.168.89.131:28379");   JedisSentinelPool jedisPool = new JedisSentinelPool("mymaster", sentinels, config); Jedis jedis = jedisPool.getResource();               Iterator iter = jedis.keys("*").iterator();        while(iter.hasNext()){            System.out.println(iter.next());        }        jedis.close();        jedisPool.close();

 

Jedis 连接Redis Cluster

创建实验用redis集群

简单实用Redis脚本create-cluster创建实验集群：。

运行脚本之前先安装：

Yum install ruby

Yum install rubygems

cd /usr/lib/ruby/site_ruby/1.8/rubygems

gem install redis

 

运行脚本创建redis集群

[root@localhost create-cluster]# ./create-cluster start Starting 30001 Starting 30002 Starting 30003 Starting 30004 Starting 30005 Starting 30006 [root@localhost create-cluster]# ./create-cluster create >>> Creating cluster Connecting to node 127.0.0.1:30001: OK Connecting to node 127.0.0.1:30002: OK Connecting to node 127.0.0.1:30003: OK Connecting to node 127.0.0.1:30004: OK Connecting to node 127.0.0.1:30005: OK Connecting to node 127.0.0.1:30006: OK >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 127.0.0.1:30001 127.0.0.1:30002 127.0.0.1:30003 Adding replica 127.0.0.1:30004 to 127.0.0.1:30001 Adding replica 127.0.0.1:30005 to 127.0.0.1:30002 Adding replica 127.0.0.1:30006 to 127.0.0.1:30003 M: e25cdacf0aac95464e0e5216d3b00424376f53a5 127.0.0.1:30001    slots:0-5460 (5461 slots) master M: 1b8e226332478e361d446bdd321ecad95bfd7173 127.0.0.1:30002    slots:5461-10922 (5462 slots) master M: 97be80ba39e51b51b8a502a8ce15485a85306867 127.0.0.1:30003    slots:10923-16383 (5461 slots) master S: 9692ea7687aa72c44c4ce9149fe802705d54ad8a 127.0.0.1:30004    replicates e25cdacf0aac95464e0e5216d3b00424376f53a5 S: a3aeb572fada8b4f4cc1d87fec7c76f59e223c01 127.0.0.1:30005    replicates 1b8e226332478e361d446bdd321ecad95bfd7173 S: 802fb8cc906b3b29c4babc9f91aed6a845743301 127.0.0.1:30006    replicates 97be80ba39e51b51b8a502a8ce15485a85306867 Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Assign a different config epoch to each node >>> Sending CLUSTER MEET messages to join the cluster Waiting for the cluster to join. >>> Performing Cluster Check (using node 127.0.0.1:30001) M: e25cdacf0aac95464e0e5216d3b00424376f53a5 127.0.0.1:30001    slots:0-5460 (5461 slots) master M: 1b8e226332478e361d446bdd321ecad95bfd7173 127.0.0.1:30002    slots:5461-10922 (5462 slots) master M: 97be80ba39e51b51b8a502a8ce15485a85306867 127.0.0.1:30003    slots:10923-16383 (5461 slots) master M: 9692ea7687aa72c44c4ce9149fe802705d54ad8a 127.0.0.1:30004    slots: (0 slots) master    replicates e25cdacf0aac95464e0e5216d3b00424376f53a5 M: a3aeb572fada8b4f4cc1d87fec7c76f59e223c01 127.0.0.1:30005    slots: (0 slots) master    replicates 1b8e226332478e361d446bdd321ecad95bfd7173 M: 802fb8cc906b3b29c4babc9f91aed6a845743301 127.0.0.1:30006    slots: (0 slots) master    replicates 97be80ba39e51b51b8a502a8ce15485a85306867 [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered. [root@localhost create-cluster]#

 

 

示例代码

Set nodes = new HashSet();        nodes.add(new HostAndPort("192.168.89.131",30001));        JedisCluster jedisCluster = new JedisCluster(nodes);        jedisCluster.set("testkey", "testvalue");               System.out.println(jedisCluster.get("testkey"));

这里注意到只需要添加一个主机节点到JedisCluster构造函数的节点集合中，其它会由jedisCluster自动发现和更新。

 

如果添加多个的话还会发生异常??

Exception in thread "main" redis.clients.jedis.exceptions.JedisClusterMaxRedirectionsException: Too many Cluster redirections?     at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:34)     at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:68)     at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:85)     at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:68)     at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:85)     at redis.clients.jedis.JedisClusterCommand.runWithRetries(JedisClusterCommand.java:68)     at redis.clients.jedis.JedisClusterCommand.run(JedisClusterCommand.java:29)     at redis.clients.jedis.JedisCluster.get(JedisCluster.java:96)     at com.lh.example.jedis.JedisTest.main(JedisTest.java:49)