使用Java客戶端對Redis進行操作

阿豪聊乾貨發表於2017-07-09
Java客戶端Redis

一、背景

　　上篇文章我們介紹瞭如何在centos7下面進行安裝單機版redis以及redis叢集。這篇文章，我們來聊一聊如何使用java客戶端來進行操作redis。我們知道redis的java客戶端有很多,如：jedis、redission等。這篇文章著重介紹我們平常使用最多的redis的java客戶端jedis。

二、通過單元測試來小試牛刀

　　1.首先在maven的pom.xml中引入jedis-client的依賴

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
    <version>2.7.2</version>
</dependency>

　　2.使用junit進行單元測試

package com.hafiz.redis.test;

import java.util.HashSet;
import java.util.Set;

import org.junit.Test;

import redis.clients.jedis.HostAndPort;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.JedisPool;

public class JedisTest {

    @Test
    public void testJedisSingle() {
        // 建立一個jedis連線
        Jedis client = new Jedis("192.168.25.153", 6379);
        client.set("name", "zhangsan");
        String name = client.get("name");
        System.out.println(name);
        // 關閉連線
        client.close();
    }
    
    @Test
    public void testJedisPoolSingle() {
        // 建立一個連線池物件，系統中應該是單例的
        JedisPool pool = new JedisPool("192.168.25.153", 6379);
        // 從連線池中獲取一個連線
        Jedis client = pool.getResource();
        client.set("age", "100");
        String name = client.get("name");
        String age = client.get("age");
        System.out.println(name);
        System.out.println(age);
        // jedis必須關閉連線
        client.close();
        
        // 關閉連線池
        pool.close();
    }
    
    @Test
    public void testJedisCluster() {
        // 建立一個jedisCluster物件的節點集合
        Set<HostAndPort> nodes = new HashSet<>();
        // 在nodes中指定每個節點的地址
        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));
        // 建立一個jedisCluster物件，該物件在系統中應該是單例的
        JedisCluster cluster = new JedisCluster(nodes);
        cluster.set("id", "100");
        cluster.set("value", "Hello Jedis");
        System.out.println(cluster.get("id"));
        System.out.println(cluster.get("value"));
        
        // 系統關閉時，關閉叢集
        cluster.close();
    }
}

三、在專案中，使用Spring整合Redis

1.redis.properties檔案如下：

#Redis stand-alone config
redis.single.host=192.168.25.153
redis.single.port=6379

#Redis cluster config
redis.cluster.node1.host=192.168.25.153
redis.cluster.node1.port=7001
redis.cluster.node2.host=192.168.25.153
redis.cluster.node2.port=7002
redis.cluster.node3.host=192.168.25.153
redis.cluster.node3.port=7003
redis.cluster.node4.host=192.168.25.153
redis.cluster.node4.port=7004
redis.cluster.node5.host=192.168.25.153
redis.cluster.node5.port=7005
redis.cluster.node6.host=192.168.25.153
redis.cluster.node6.port=7006

2.spring-redis配置檔案如下：

<?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-beans-4.0.xsd
    　 http://www.springframework.org/schema/context 
　　　　http://www.springframework.org/schema/context/spring-context-4.0.xsd
    　 http://www.springframework.org/schema/aop 
　　　　http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
　　　　http://www.springframework.org/schema/tx
　　　　http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    　 http://www.springframework.org/schema/util 
　　　　http://www.springframework.org/schema/util/spring-util-4.0.xsd">

    <!-- Redis stand-alone config -->
    <bean id = "jedisPool" class = "redis.clients.jedis.JedisPool">
        <constructor-arg name="host" value="${redis.single.host}"/>
        <constructor-arg name="port" value="${redis.single.port}"/>
    </bean>
    <bean id = "singleJedisClient" class = "com.taotao.rest.component.impl.SingleJedisClient"/>

　　 <!-- Redis cluster config -->
　　 <!-- <bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
        <constructor-arg name="nodes">
            <set>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.cluster.node1.host}"/>
                    <constructor-arg name="port" value="${redis.cluster.node1.port}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.cluster.node2.host}"/>
                    <constructor-arg name="port" value="${redis.cluster.node2.port}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.cluster.node3.host}"/>
                    <constructor-arg name="port" value="${redis.cluster.node3.port}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.cluster.node4.host}"/>
                    <constructor-arg name="port" value="${redis.cluster.node4.port}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.cluster.node5.host}"/>
                    <constructor-arg name="port" value="${redis.cluster.node5.port}"/>
                </bean>
                <bean class="redis.clients.jedis.HostAndPort">
                    <constructor-arg name="host" value="${redis.cluster.node6.host}"/>
                    <constructor-arg name="port" value="${redis.cluster.node6.port}"/>
                </bean>
            </set>
        </constructor-arg>
    </bean>
    <bean id="clusterJedisClient" class="com.hafiz.rest.component.impl.ClusterJedisClient"/> -->
</beans>

預設放開的是單機版配置，如需使用叢集版請註釋上面單機版配置，並開啟下面叢集版配置。

3.接著我們編寫一個JedisClient介面類

package com.hafiz.component;

public interface JedisClient {
    
    String set(String key, String value);
    String get(String key);
    Long del(String key);
    Long hset(String key, String item, String value);
    String hget(String key, String item);
    Long hdel(String key, String... item);
    Long incr(String key);
    Long decr(String key);
    Long expire(String key, int seconds);
    Long ttl(String key);
}

4.然後我們給出單機版的實現類：SingleJedisClient.java 

package com.hafiz.component.impl;

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

import com.taotao.rest.component.JedisClient;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

/**
 * Redis單機客戶端工具類
 * @author Administrator
 */
public class SingleJedisClient implements JedisClient {
    
    @Autowired
    private JedisPool jedisPool;

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

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

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

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

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

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

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

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

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

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

}

5.我們再提供叢集版的實現類:ClusterJedisClient.java 

package com.hafiz.component.impl;

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

import com.taotao.rest.component.JedisClient;

import redis.clients.jedis.JedisCluster;

/**
 * Redis叢集客戶端工具類
 * @author Administrator
 */
public class ClusterJedisClient 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 Long del(String key) {
        return jedisCluster.del(key);
    }

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

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

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

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

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

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

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

}

6.spring整合redis單元測試

package com.taotao.rest.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.taotao.rest.component.JedisClient;

public class SpringJedisTest {
    
    @Test
    public void testJedisClientSpring() throws Exception {
        //建立一個spring容器
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext-*.xml");
        //從容器中獲得JedisClient物件
        JedisClient jedisClient = applicationContext.getBean(JedisClient.class);
        //jedisClient操作redis
        jedisClient.set("cliet1", "1000");
        String string = jedisClient.get("cliet1");
        System.out.println(string);
    }
}

四、總結

　　通過本文我們對jedis的使用有了進一步的瞭解，知道了如何使用spring對redis進行整合，也對jedisClient做了單機以及叢集的實現。很有成就感，未來走向架構師的路還有很遠，繼續努力吧！

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