Redis系列八 使用Jedis

使用Jedis jar操作Redis

1、配置redis.conf文件,修改

  

2、建java工程,加入 jedis jar包

  

3、代码示例:

  1 package com.ntjr.redis;
  2 
  3 import java.util.HashMap;
  4 import java.util.Iterator;
  5 import java.util.List;
  6 import java.util.Map;
  7 import java.util.Set;
  8 
  9 import org.junit.Before;
 10 import org.junit.Test;
 11 
 12 import redis.clients.jedis.Jedis;
 13 
 14 public class TestApi {
 15     private Jedis jedis;
 16 
 17     /**
 18      * 连接192.168.15.128:6379 Redis
 19      */
 20     @Before
 21     public void before() {
 22         jedis = new Jedis("192.168.15.128", 6379);
 23     }
 24 
 25     
 26     /**
 27      * 测试set get  及 过期时间,返回-1代表永不过期
 28      */
 29     @Test
 30     public void testSetKey() {
 31         jedis.set("k1", "v1");
 32         jedis.set("k2", "v2");
 33         jedis.set("k3", "v3");
 34         System.out.println(jedis.get("k3"));
 35         System.out.println(jedis.ttl("k1"));
 36     }
 37 
 38     
 39     /**
 40      * 获取所有的key
 41      */
 42     @Test
 43     public void testGet() {
 44         Set<String> keys = jedis.keys("*");
 45         for (Iterator<String> iterator = keys.iterator(); iterator.hasNext();) {
 46             String key = (String) iterator.next();
 47             System.out.println(key);
 48         }
 49     }
 50 
 51     /**
 52      * 是否存在k2
 53      */
 54     @Test
 55     public void testExists() {
 56         System.out.println(jedis.exists("k2"));
 57     }
 58 
 59     /**
 60      * string 追加
 61      */
 62     @Test
 63     public void testAppend() {
 64         jedis.append("k1", "myredis");
 65         System.out.println(jedis.get("k1"));
 66     }
 67 
 68     /**
 69      * 设置多个键值对
 70      */
 71     @Test
 72     public void testMSET() {
 73         jedis.mset("str1", "v1", "str2", "v2", "str3", "v3");
 74         System.out.println(jedis.mget("str1", "str2", "str3"));
 75     }
 76 
 77     /**
 78      * 测试为list设置值,获取list集合
 79      */
 80     @Test
 81     public void testLPUSH() {
 82         jedis.lpush("mylist", "v1", "v2", "v3", "v4", "v5");
 83         List<String> myList = jedis.lrange("mylist", 0, -1);
 84         for (String element : myList) {
 85             System.out.println(element);
 86         }
 87     }
 88 
 89     /**
 90      * Set集合的添加、遍历、删除
 91      */
 92     @Test
 93     public void testSet() {
 94         jedis.sadd("orders", "jd001");
 95         jedis.sadd("orders", "jd002");
 96         jedis.sadd("orders", "jd003");
 97         Set<String> orders = jedis.smembers("orders");
 98         for (Iterator<String> iterator = orders.iterator(); iterator.hasNext();) {
 99             System.out.println(iterator.next());
100         }
101         jedis.srem("orders", "jd002");
102         System.out.println(jedis.smembers("orders").size());
103     }
104 
105     /**
106      * Map集合操作,获取多个值
107      */
108     @Test
109     public void testHash() {
110         jedis.hset("hash1", "uername", "lisi");
111         System.out.println(jedis.hget("hash1", "uername"));
112         Map<String, String> map = new HashMap<>();
113         map.put("telphone", "13811814763");
114         map.put("address", "atguigu");
115         map.put("email", "abc@163.com");
116         jedis.hmset("hash1", map);
117         List<String> result = jedis.hmget("hash1", "telphone", "email");
118         for (String element : result) {
119             System.out.println(element);
120         }
121     }
122 
123     /**
124      * Zset设置,为每个数据设置 score
125      */
126     @Test
127     public void testZSET() {
128         jedis.zadd("zset01", 60d, "v1");
129         jedis.zadd("zset01", 70d, "v2");
130         jedis.zadd("zset01", 80d, "v3");
131         jedis.zadd("zset01", 90d, "v4");
132         Set<String> zset = jedis.zrange("zset01", 0, -1);
133         for(Iterator<String> iterator = zset.iterator();iterator.hasNext(); ){
134             System.out.println(iterator.next());
135         }
136     }
137 
138 }

4、使用JedisPool连接池

 1 package com.ntjr.redis;
 2 
 3 import redis.clients.jedis.Jedis;
 4 import redis.clients.jedis.JedisPool;
 5 import redis.clients.jedis.JedisPoolConfig;
 6 
 7 public class JedisPoolUtils {
 8 
 9     private static volatile JedisPool jedisPool = null;
10 
11     private JedisPoolUtils() {
12     }
13 
14     public static JedisPool getJedisPoolInstance() {
15         synchronized (JedisPoolUtils.class) {
16             if (jedisPool == null) {
17                 synchronized (JedisPoolUtils.class) {
18                     if (jedisPool == null) {
19                         JedisPoolConfig poolConfig = new JedisPoolConfig();
20                         poolConfig.setMaxActive(1000);
21                         poolConfig.setMaxIdle(30);
22                         poolConfig.setMaxWait(100*1000);
23                         poolConfig.setTestOnBorrow(true);
24                         jedisPool = new JedisPool(poolConfig, "192.168.15.128", 6379);
25                     }
26                 }
27             }
28         }
29         return jedisPool;
30     }
31     
32     
33     
34     public static void release(JedisPool jedisPool,Jedis jedis){
35         if(jedis!=null){
36             jedisPool.returnResourceObject(jedis);
37         }
38     }
39 
40 }

5、JedisPool配置参数

  JedisPool的配置参数大部分是由JedisPoolConfig的对应项来赋值的。
  maxActive:控制一个pool可分配多少个jedis实例,通过pool.getResource()来获取;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。
  maxIdle:控制一个pool最多有多少个状态为idle(空闲)的jedis实例;
  whenExhaustedAction:表示当pool中的jedis实例都被allocated完时,pool要采取的操作;默认有三种。
   WHEN_EXHAUSTED_FAIL --> 表示无jedis实例时,直接抛出NoSuchElementException;
   WHEN_EXHAUSTED_BLOCK --> 则表示阻塞住,或者达到maxWait时抛出JedisConnectionException;
   WHEN_EXHAUSTED_GROW --> 则表示新建一个jedis实例,也就说设置的maxActive无用;
  maxWait:表示当borrow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JedisConnectionException;
  testOnBorrow:获得一个jedis实例的时候是否检查连接可用性(ping());如果为true,则得到的jedis实例均是可用的

  testOnReturn:return 一个jedis实例给pool时,是否检查连接可用性(ping());  

  testWhileIdle:如果为true,表示有一个idle object evitor线程对idle object进行扫描,如果validate失败,此object会被从pool中drop掉;这一项只有在timeBetweenEvictionRunsMillis大于0时才有意义;  

  timeBetweenEvictionRunsMillis:表示idle object evitor两次扫描之间要sleep的毫秒数;

  numTestsPerEvictionRun:表示idle object evitor每次扫描的最多的对象数;

  minEvictableIdleTimeMillis:表示一个对象至少停留在idle状态的最短时间,然后才能被idle object evitor扫描并驱逐;这一项只有在timeBetweenEvictionRunsMillis大于0时才有意义;

  softMinEvictableIdleTimeMillis:在minEvictableIdleTimeMillis基础上,加入了至少minIdle个对象已经在pool里面了。如果为-1,evicted不会根据idle time驱逐任何对象。如果minEvictableIdleTimeMillis>0,则此项设置无意义,且只有在timeBetweenEvictionRunsMillis大于0时才有意义;

  lifo:borrowObject返回对象时,是采用DEFAULT_LIFO(last in first out,即类似cache的最频繁使用队列),如果为False,则表示FIFO队列;

==================================================================================================================
  其中JedisPoolConfig对一些参数的默认设置如下:
  testWhileIdle=true
  minEvictableIdleTimeMills=60000
  timeBetweenEvictionRunsMillis=30000
numTestsPerEvictionRun=-1

6、链接集群

  第一步:使用JedisCluster对象。需要一个Set<HostAndPort>参数。Redis节点的列表。

  第二步:直接使用JedisCluster对象操作redis。在系统中单例存在。

  第三步:打印结果

  第四步:系统关闭前,关闭JedisCluster对象。

public void testJedisCluster() throws Exception {
        // 第一步:使用JedisCluster对象。需要一个Set<HostAndPort>参数。Redis节点的列表。
        Set<HostAndPort> nodes = new HashSet<>();
        nodes.add(new HostAndPort("192.168.25.153", 7001));
        nodes.add(new HostAndPort("192.168.25.153", 7002));
        nodes.add(new HostAndPort("192.168.25.153", 7003));
        nodes.add(new HostAndPort("192.168.25.153", 7004));
        nodes.add(new HostAndPort("192.168.25.153", 7005));
        nodes.add(new HostAndPort("192.168.25.153", 7006));
        JedisCluster jedisCluster = new JedisCluster(nodes);
        // 第二步:直接使用JedisCluster对象操作redis。在系统中单例存在。
        jedisCluster.set("hello", "100");
        String result = jedisCluster.get("hello");
        // 第三步:打印结果
        System.out.println(result);
        // 第四步:系统关闭前,关闭JedisCluster对象。
        jedisCluster.close();
    }

 

 7、使用Redis向业务逻辑中添加缓存

  1、接口封装:常用的操作redis的方法提取出一个接口,分别对应单机版和集群版创建两个实现类。

  2、接口定义

public interface JedisClient {

    String set(String key, String value);
    String get(String key);
    Boolean exists(String key);
    Long expire(String key, int seconds);
    Long ttl(String key);
    Long incr(String key);
    Long hset(String key, String field, String value);
    String hget(String key, String field);
    Long hdel(String key, String... field);
}

 

 3、单机版实现

public class JedisClientPool implements JedisClient {
    
    @Autowired
    private JedisPool jedisPool;

    @Override
    public String set(String key, String value) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.set(key, value);
        jedis.close();
        return result;
    }

    @Override
    public String get(String key) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.get(key);
        jedis.close();
        return result;
    }

    @Override
    public Boolean exists(String key) {
        Jedis jedis = jedisPool.getResource();
        Boolean result = jedis.exists(key);
        jedis.close();
        return result;
    }

    @Override
    public Long expire(String key, int seconds) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.expire(key, seconds);
        jedis.close();
        return result;
    }

    @Override
    public Long ttl(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.ttl(key);
        jedis.close();
        return result;
    }

    @Override
    public Long incr(String key) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.incr(key);
        jedis.close();
        return result;
    }

    @Override
    public Long hset(String key, String field, String value) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hset(key, field, value);
        jedis.close();
        return result;
    }

    @Override
    public String hget(String key, String field) {
        Jedis jedis = jedisPool.getResource();
        String result = jedis.hget(key, field);
        jedis.close();
        return result;
    }

    @Override
    public Long hdel(String key, String... field) {
        Jedis jedis = jedisPool.getResource();
        Long result = jedis.hdel(key, field);
        jedis.close();
        return result;
    }

}

  4、集群版实现

package cn.e3mall.jedis;

import org.springframework.beans.factory.annotation.Autowired;

import redis.clients.jedis.JedisCluster;

public class JedisClientCluster implements JedisClient {
    
    @Autowired
    private JedisCluster jedisCluster;

    @Override
    public String set(String key, String value) {
        return jedisCluster.set(key, value);
    }

    @Override
    public String get(String key) {
        return jedisCluster.get(key);
    }

    @Override
    public Boolean exists(String key) {
        return jedisCluster.exists(key);
    }

    @Override
    public Long expire(String key, int seconds) {
        return jedisCluster.expire(key, seconds);
    }

    @Override
    public Long ttl(String key) {
        return jedisCluster.ttl(key);
    }

    @Override
    public Long incr(String key) {
        return jedisCluster.incr(key);
    }

    @Override
    public Long hset(String key, String field, String value) {
        return jedisCluster.hset(key, field, value);
    }

    @Override
    public String hget(String key, String field) {
        return jedisCluster.hget(key, field);
    }

    @Override
    public Long hdel(String key, String... field) {
        return jedisCluster.hdel(key, field);
    }

}

 

 5、spring配置单机版 

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans4.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context4.2.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx4.2.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util4.2.xsd">

    <!-- 配置单机版的连接 -->
    <bean id="jedisPool" class="redis.clients.jedis.JedisPool">
        <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
        <constructor-arg name="port" value="6379"></constructor-arg>
    </bean>
    <bean id="jedisClientPool" class="cn.e3mall.jedis.JedisClientPool"/>
    
</beans>

 

  6、spring集群版配置

<!-- 集群版的配置 -->
    <bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
        <constructor-arg>
            <set>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
                    <constructor-arg name="port" value="7001"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
                    <constructor-arg name="port" value="7002"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
                    <constructor-arg name="port" value="7003"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
                    <constructor-arg name="port" value="7004"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
                    <constructor-arg name="port" value="7005"></constructor-arg>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="192.168.25.153"></constructor-arg>
                    <constructor-arg name="port" value="7006"></constructor-arg>
                </bean>
            </set>
        </constructor-arg>
    </bean>
    <bean id="jedisClientCluster" class="cn.e3mall.jedis.JedisClientCluster"/>

注意:单机版和集群版不能共存,使用单机版时注释集群版的配置。使用集群版,把单机版注释。

 

 

  

 

posted @ 2017-06-10 20:37  IT-執念  阅读(256)  评论(0编辑  收藏  举报