• 三:Redis连接池、JedisPool详解、Redisi分布式


    单机模式

     1 package com.ljq.utils;
     2 
     3 import redis.clients.jedis.Jedis;
     4 import redis.clients.jedis.JedisPool;
     5 import redis.clients.jedis.JedisPoolConfig;
     6 
     7 /**   
     8  * Redis操作接口
     9  *
    10  * @author NiceCui
    11  * @version 1.0 2017-6-14 上午08:54:14   
    12  */
    13 public class RedisAPI {
    14     private static JedisPool pool = null;
    15     
    16     /**
    17      * 构建redis连接池
    18      * 
    19      * @param ip
    20      * @param port
    21      * @return JedisPool
    22      */
    23     public static JedisPool getPool() {
    24         if (pool == null) {
    25             JedisPoolConfig config = new JedisPoolConfig();
    26             //控制一个pool可分配多少个jedis实例,通过pool.getResource()来获取;
    27             //如果赋值为-1,则表示不限制;如果pool已经分配了maxActive个jedis实例,则此时pool的状态为exhausted(耗尽)。
    28             config.setMaxActive(500);
    29             //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例。
    30             config.setMaxIdle(5);
    31             //表示当borrow(引入)一个jedis实例时,最大的等待时间,如果超过等待时间,则直接抛出JedisConnectionException;
    32             config.setMaxWait(1000 * 100);
    33             //在borrow一个jedis实例时,是否提前进行validate操作;如果为true,则得到的jedis实例均是可用的;
    34             config.setTestOnBorrow(true);
    35             pool = new JedisPool(config, "192.168.2.191", 8888);
    36         }
    37         return pool;
    38     }
    39     
    40     /**
    41      * 返还到连接池
    42      * 
    43      * @param pool 
    44      * @param redis
    45      */
    46     public static void returnResource(JedisPool pool, Jedis redis) {
    47         if (redis != null) {
    48             pool.returnResource(redis);
    49         }
    50     }
    51     
    52     /**
    53      * 获取数据
    54      * 
    55      * @param key
    56      * @return
    57      */
    58     public static String get(String key){
    59         String value = null;
    60         
    61         JedisPool pool = null;
    62         Jedis jedis = null;
    63         try {
    64             pool = getPool();
    65             jedis = pool.getResource();
    66             value = jedis.get(key);
    67         } catch (Exception e) {
    68             //释放redis对象
    69             pool.returnBrokenResource(jedis);
    70             e.printStackTrace();
    71         } finally {
    72             //返还到连接池
    73             returnResource(pool, jedis);
    74         }
    75         
    76         return value;
    77     }
    78 }

    分布式模式

    ShardedJe、dis是基于一致性哈希算法实现的分布式Redis集群客户端

     1 package com.jd.redis.client;
     2   
     3 import java.util.ArrayList;
     4 import java.util.List;
     5   
     6 import redis.clients.jedis.JedisPoolConfig;
     7 import redis.clients.jedis.JedisShardInfo;
     8 import redis.clients.jedis.ShardedJedis;
     9 import redis.clients.jedis.ShardedJedisPool;
    10 import redis.clients.util.Hashing;
    11 import redis.clients.util.Sharded;
    12   
    13 publicclass RedisShardPoolTest {
    14      
    15 static ShardedJedisPoolpool;
    16      
    17 static{
    18          
    19 JedisPoolConfig config =new JedisPoolConfig();//Jedis池配置
    20          
    21 config.setMaxActive(500);//最大活动的对象个数
    22          
    23 config.setMaxIdle(1000 * 60);//对象最大空闲时间
    24         
    25 config.setMaxWait(1000 * 10);//获取对象时最大等待时间
    26        
    27 config.setTestOnBorrow(true);
    28          
    29 String hostA = "10.10.224.44";
    30         
    31 int portA = 6379;
    32         
    33 String hostB = "10.10.224.48";
    34         
    35 int portB = 6379;
    36          
    37 List<JedisShardInfo> jdsInfoList =new ArrayList<JedisShardInfo>(2);
    38          
    39 JedisShardInfo infoA = new JedisShardInfo(hostA, portA);
    40          
    41 infoA.setPassword("redis.360buy");
    42          
    43 JedisShardInfo infoB = new JedisShardInfo(hostB, portB);
    44          
    45 infoB.setPassword("redis.360buy");
    46          
    47 jdsInfoList.add(infoA);
    48          
    49 jdsInfoList.add(infoB);
    50          
    51          
    52 pool =new ShardedJedisPool(config, jdsInfoList, Hashing.MURMUR_HASH,
    53 Sharded.DEFAULT_KEY_TAG_PATTERN);
    54     //传入连接池配置、分布式redis服务器主机信息、分片规则(存储到哪台redis服务器)
    55 }
    56      
    57      
    58 /**
    59      
    60  * @param args
    61      
    62  */
    63      
    64 publicstaticvoid main(String[] args) {
    65          
    66 for(int i=0; i<100; i++){
    67            String key =generateKey();
    68            //key += "{aaa}";
    69            ShardedJedis jds =null;
    70            try {
    71                jds =pool.getResource();
    72                System.out.println(key+":"+jds.getShard(key).getClient().getHost());
    73                System.out.println(jds.set(key,"1111111111111111111111111111111"));
    74            }catch (Exception e) {
    75                e.printStackTrace();
    76            }
    77            finally{
    78                pool.returnResourceObject(jds);
    79            }
    80          
    81 }
    82      
    83 }
    84   
    85      
    86 privatestaticintindex = 1;
    87      
    88 publicstatic String generateKey(){
    89          
    90 return String.valueOf(Thread.currentThread().getId())+"_"+(index++);
    91      
    92 }
    93 }
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  • 原文地址:https://www.cnblogs.com/NiceCui/p/8075103.html
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