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redis 学习笔记(5)-Spring与Jedis的集成
首先不得不服Spring这个宇宙无敌的开源框架,几乎整合了所有流行的其它框架,http://projects.spring.io/spring-data/ 从这上面看,当下流行的redis、solr、hadoop、mongoDB、couchBase... 全都收入囊中。对于redis整合而言,主要用到的是spring-data-redis
使用步骤:
一、pom添加依赖项
<dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>1.4.1.RELEASE</version> </dependency>
其它Spring必备组件,比如Core,Beans之类,大家自行添加吧
观察一下:
jedis、jredis等常用java的redis client已经支持了,不知道以后会不会集成Redisson,spring-data-redis提供了一个非常有用的类:StringRedisTemplate
对于大多数缓存应用场景而言,字符串是最常用的缓存项,用StringRedisTemplate可以轻松应付。
二、spring配置
1 <bean id="redisSentinelConfiguration" 2 class="org.springframework.data.redis.connection.RedisSentinelConfiguration"> 3 <property name="master"> 4 <bean class="org.springframework.data.redis.connection.RedisNode"> 5 <property name="name" value="mymaster"></property> 6 </bean> 7 </property> 8 <property name="sentinels"> 9 <set>10 <bean class="org.springframework.data.redis.connection.RedisNode">11 <constructor-arg index="0" value="10.6.1**.**5" />12 <constructor-arg index="1" value="7031" /> 13 </bean>14 <bean class="org.springframework.data.redis.connection.RedisNode">15 <constructor-arg index="0" value="10.6.1**.**6" />16 <constructor-arg index="1" value="7031" /> 17 </bean>18 <bean class="org.springframework.data.redis.connection.RedisNode"> 19 <constructor-arg index="0" value="10.6.1**.**1" />20 <constructor-arg index="1" value="7031" /> 21 </bean>22 </set>23 </property>24 </bean>25 26 <bean id="jedisConnFactory"27 class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">28 <constructor-arg ref="redisSentinelConfiguration" /> 29 </bean>30 31 <bean id="stringRedisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">32 <property name="connectionFactory" ref="jedisConnFactory" />33 </bean>
这里我们使用Sentinel模式来配置redis连接,从上篇学习知道,sentinel是一种高可用架构,个人推荐在生产环境中使用sentinel模式。
三、单元测试
1 @Test 2 public void testSpringRedis() { 3 ConfigurableApplicationContext ctx = null; 4 try { 5 ctx = new ClassPathXmlApplicationContext("spring.xml"); 6 7 StringRedisTemplate stringRedisTemplate = ctx.getBean("stringRedisTemplate", StringRedisTemplate.class); 8 9 // String读写10 stringRedisTemplate.delete("myStr");11 stringRedisTemplate.opsForValue().set("myStr", "http://yjmyzz.cnblogs.com/");12 System.out.println(stringRedisTemplate.opsForValue().get("myStr"));13 System.out.println("---------------");14 15 // List读写16 stringRedisTemplate.delete("myList");17 stringRedisTemplate.opsForList().rightPush("myList", "A");18 stringRedisTemplate.opsForList().rightPush("myList", "B");19 stringRedisTemplate.opsForList().leftPush("myList", "0");20 List<String> listCache = stringRedisTemplate.opsForList().range(21 "myList", 0, -1);22 for (String s : listCache) {23 System.out.println(s);24 }25 System.out.println("---------------");26 27 // Set读写28 stringRedisTemplate.delete("mySet");29 stringRedisTemplate.opsForSet().add("mySet", "A");30 stringRedisTemplate.opsForSet().add("mySet", "B");31 stringRedisTemplate.opsForSet().add("mySet", "C");32 Set<String> setCache = stringRedisTemplate.opsForSet().members(33 "mySet");34 for (String s : setCache) {35 System.out.println(s);36 }37 System.out.println("---------------");38 39 // Hash读写40 stringRedisTemplate.delete("myHash");41 stringRedisTemplate.opsForHash().put("myHash", "PEK", "北京");42 stringRedisTemplate.opsForHash().put("myHash", "SHA", "上海虹桥");43 stringRedisTemplate.opsForHash().put("myHash", "PVG", "浦东");44 Map<Object, Object> hashCache = stringRedisTemplate.opsForHash()45 .entries("myHash");46 for (Map.Entry<Object, Object> entry : hashCache.entrySet()) {47 System.out.println(entry.getKey() + " - " + entry.getValue());48 }49 50 System.out.println("---------------");51 52 } finally {53 if (ctx != null && ctx.isActive()) {54 ctx.close();55 }56 }57 58 }
运行一下,行云流水般的输出:
...
信息: Created JedisPool to master at 10.6.144.***:7030
http://yjmyzz.cnblogs.com/
---------------
0
A
B
---------------
C
B
A
---------------
SHA - 上海虹桥
PVG - 浦东
PEK - 北京
---------------
...
注意红色标出部分,从eclipse控制台的输出,还能看出当前的master是哪台服务器
三、POJO对象的缓存
Spring提供的StringRedisTemplate只能对String操作,大多数情况下已经够用,但如果真需要向redis中存放POJO对象也不难,我们可以参考StringRedisTemplate的源码,扩展出ObjectRedisTemplate
1 package org.springframework.data.redis.core; 2 3 import org.springframework.data.redis.connection.DefaultStringRedisConnection; 4 import org.springframework.data.redis.connection.RedisConnection; 5 import org.springframework.data.redis.connection.RedisConnectionFactory; 6 import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer; 7 import org.springframework.data.redis.serializer.RedisSerializer; 8 9 public class ObjectRedisTemplate<T> extends RedisTemplate<String, T> {10 11 public ObjectRedisTemplate(RedisConnectionFactory connectionFactory,12 Class<T> clazz) {13 14 RedisSerializer<T> objectSerializer = new Jackson2JsonRedisSerializer<T>(15 clazz);16 setKeySerializer(objectSerializer);17 setValueSerializer(objectSerializer);18 setHashKeySerializer(objectSerializer);19 setHashValueSerializer(objectSerializer);20 21 setConnectionFactory(connectionFactory);22 afterPropertiesSet();23 }24 25 protected RedisConnection preProcessConnection(RedisConnection connection,26 boolean existingConnection) {27 return new DefaultStringRedisConnection(connection);28 }29 }
然后就可以这样用了:
1 @Test 2 public void testSpringRedis() { 3 ConfigurableApplicationContext ctx = null; 4 try { 5 ctx = new ClassPathXmlApplicationContext("spring.xml"); 6 7 JedisConnectionFactory connFactory = ctx.getBean( 8 "jedisConnFactory", JedisConnectionFactory.class); 9 10 ObjectRedisTemplate<SampleBean> template = new ObjectRedisTemplate<SampleBean>(11 connFactory, SampleBean.class);12 13 template.delete("myBean");14 SampleBean bean = new SampleBean("菩提树下的杨过");15 template.opsForValue().set("myBean", bean);16 17 System.out.println(template.opsForValue().get("myBean"));18 19 } finally {20 if (ctx != null && ctx.isActive()) {21 ctx.close();22 }23 }24 }
其中SampleBean的定义如下:
1 package com.cnblogs.yjmyzz; 2 3 import java.io.Serializable; 4 5 public class SampleBean implements Serializable { 6 7 private static final long serialVersionUID = -303232410998377570L; 8 9 private String name;10 11 public SampleBean() {12 }13 14 public SampleBean(String name) {15 this.name = name;16 }17 18 public String getName() {19 return name;20 }21 22 public void setName(String name) {23 this.name = name;24 }25 26 public String toString() {27 return "name:" + name;28 }29 30 }
注:由于不是标准的String类型,所以在redis控制台,用./redis-cli get myBean是看不到缓存内容的,只能得到nil的输出,不要误以为set没成功!通过代码是可以正常get到缓存值的。
redis 学习笔记(5)-Spring与Jedis的集成