spring集成redis(单节点)

xiaoxiao2021-03-01  8

redis是一种非关系型数据库,与mongoDB不同的是redis是内存数据库,所以访问速度很快。常用作缓存和发布-订阅式的消息队列。redis官方没有提供windows版本的软件。windows版本一直是微软维护的。

下载地址:https://github.com/MSOpenTech/redis/releases

这里是redis相关的教程。http://muxiulin.cn/archives/1197

在spring中集成redis很简单,这里用的是ssm框架+maven构建的项目。

1、首先是需要引入的pom.xml文件:

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.redis</groupId> <artifactId>spring-redis</artifactId> <version>1.0-SNAPSHOT</version> <name>spring-redis</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> <spring.version>4.3.17.RELEASE</spring.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!-- 日志 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.25</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.25</version> </dependency> <!-- redis --> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>1.7.2.RELEASE</version> </dependency> <dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.9.0</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.5</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.45</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.8.8</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.7</version> </dependency> </dependencies> <build> <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.5.1</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.0.0</version> </plugin> <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging --> <plugin> <artifactId>maven-resources-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.7.0</version> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.20.1</version> </plugin> <plugin> <artifactId>maven-jar-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-install-plugin</artifactId> <version>2.5.2</version> </plugin> <plugin> <artifactId>maven-deploy-plugin</artifactId> <version>2.8.2</version> </plugin> </plugins> </pluginManagement> </build> </project> 2、Redis参数配置 :redis.properties #ip地址 redis.host=127.0.0.1 #端口号 redis.port=6389 #如果有密码 redis.pass=123456 redis.dbIndex=0 redis.expiration=3000 #最大空闲数 redis.maxIdle=300 #连接池的最大数据库连接数。设为0表示无限制,如果是jedis 2.4以后用redis.maxTotal redis.maxActive=600 #最大建立连接等待时间 redis.maxWait=1000 #是否在从池中取出连接前进行检验,如果检验失败,则从池中去除连接并尝试取出另一个 redis.testOnBorrow=true #客户端超时时间单位是毫秒 默认是2000 redis.timeout=10000 #控制一个pool可分配多少个jedis实例,用来替换上面的redis.maxActive,如果是jedis 2.4以后用该属性 redis.maxTotal=1000 #最大建立连接等待时间。如果超过此时间将接到异常。设为-1表示无限制。 redis.maxWaitMillis=1000 #连接的最小空闲时间 默认1800000毫秒(30分钟) redis.minEvictableIdleTimeMillis=300000 #每次释放连接的最大数目,默认3 redis.numTestsPerEvictionRun=1024 #逐出扫描的时间间隔(毫秒) 如果为负数,则不运行逐出线程, 默认-1 redis.timeBetweenEvictionRunsMillis=30000 #在空闲时检查有效性, 默认false redis.testWhileIdle=true

3、Redis配置文件 :redis.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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"> <description>redis单节点</description> <!-- 加载properties文件 --> <bean id="propertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath*:/redis.properties</value> </list> </property> </bean> <!-- 配置JedisPoolConfig实例 --> <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig"> <!--最大空闲数--> <property name="maxIdle" value="${redis.maxIdle}" /> <!--连接池的最大数据库连接数 --> <property name="maxTotal" value="${redis.maxActive}" /> <!--最大建立连接等待时间--> <property name="maxWaitMillis" value="${redis.maxWait}" /> <!--是否在从池中取出连接前进行检验,如果检验失败,则从池中去除连接并尝试取出另一个--> <property name="testOnBorrow" value="${redis.testOnBorrow}" /> <!--逐出连接的最小空闲时间 默认1800000毫秒(30分钟)--> <property name="minEvictableIdleTimeMillis" value="${redis.minEvictableIdleTimeMillis}" /> <!--每次逐出检查时 逐出的最大数目 如果为负数就是 : 1/abs(n), 默认3--> <property name="numTestsPerEvictionRun" value="${redis.numTestsPerEvictionRun}" /> <!--逐出扫描的时间间隔(毫秒) 如果为负数,则不运行逐出线程, 默认-1--> <property name="timeBetweenEvictionRunsMillis" value="${redis.timeBetweenEvictionRunsMillis}" /> </bean> <!-- 配置JedisConnectionFactory --> <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"> <property name="hostName" value="${redis.host}" /> <property name="port" value="${redis.port}" /> <property name="password" value="${redis.pass}" /> <property name="database" value="${redis.dbIndex}" /> <property name="poolConfig" ref="poolConfig" /> </bean> <!-- key序列化 --> <bean id="stringRedisSerializer" class="org.springframework.data.redis.serializer.StringRedisSerializer" /> <bean id="stringRedisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate"> <property name="connectionFactory" ref="jedisConnectionFactory" /> </bean> <!-- 配置RedisTemplate --> <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"> <property name="connectionFactory" ref="jedisConnectionFactory" /> <!--<property name="keySerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> <property name="valueSerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> <property name="hashKeySerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> <property name="hashValueSerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property>--> </bean> <!-- 配置RedisCacheManager --> <bean id="redisCacheManager" class="org.springframework.data.redis.cache.RedisCacheManager"> <constructor-arg name="redisOperations" ref="redisTemplate" /> <property name="defaultExpiration" value="${redis.expiration}" /> </bean> <!-- 配置RedisCacheConfig --> <bean id="redisCacheConfig" class="com.custom.config.redis.RedisCacheConfig"> <constructor-arg ref="jedisConnectionFactory" /> <constructor-arg ref="redisTemplate" /> <constructor-arg ref="redisCacheManager" /> </bean> </beans>4、将redis配置文件加入到applicationContext中:applicationContext-basic.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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"> <description>Spring公共配置 </description> <!-- 使用annotation 自动注册bean, 并保证@Required、@Autowired的属性被注入 --> <context:component-scan base-package="com.custom"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" /> </context:component-scan> <!-- redis单节点配置 --> <import resource="classpath*:redis.xml" /> </beans>

5、RedisCacheCofig配置文件:RedisCacheConfig.java

import org.springframework.cache.annotation.CachingConfigurerSupport; import org.springframework.cache.annotation.EnableCaching; import org.springframework.cache.interceptor.KeyGenerator; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.cache.RedisCacheManager; import org.springframework.data.redis.connection.jedis.JedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import java.lang.reflect.Method; /** * Copyright (C), 2011-2018 {company} * FileName: com.huateng.config.RedisCacheConfig.java * Author: xxx * Email: xxx * Date: 2018/6/6 17:49 * Description: * History: * <Author> <Time> <version> <desc> * {xxx} 17:49 1.0 Create */ @Configuration @EnableCaching public class RedisCacheConfig extends CachingConfigurerSupport { private volatile JedisConnectionFactory jedisConnectionFactory; private volatile RedisTemplate<String, String> redisTemplate; private volatile RedisCacheManager redisCacheManager; public RedisCacheConfig() { super(); } /** * 带参数的构造方法 初始化所有的成员变量 * * @param jedisConnectionFactory * @param redisTemplate * @param redisCacheManager */ public RedisCacheConfig(JedisConnectionFactory jedisConnectionFactory, RedisTemplate<String, String> redisTemplate, RedisCacheManager redisCacheManager) { this.jedisConnectionFactory = jedisConnectionFactory; this.redisTemplate = redisTemplate; this.redisCacheManager = redisCacheManager; } public JedisConnectionFactory getJedisConnecionFactory() { return jedisConnectionFactory; } public RedisTemplate<String, String> getRedisTemplate() { return redisTemplate; } public RedisCacheManager getRedisCacheManager() { return redisCacheManager; } @Bean public KeyGenerator customKeyGenerator() { return new KeyGenerator() { @Override public Object generate(Object target, Method method, Object... objects) { StringBuilder sb = new StringBuilder(); sb.append(target.getClass().getName()); sb.append(method.getName()); for (Object obj : objects) { sb.append(obj.toString()); } return sb.toString(); } }; } }

6、redis实现方法的结果缓存

缓存机制说明:所有的查询结果都放进了缓存,也就是把MySQL查询的结果放到了redis中去, 然后第二次发起该条查询时就可以从redis中去读取查询的结果,从而不与MySQL交互,从而达到优化的效果, redis的查询速度之于MySQL的查询速度相当于 内存读写速度 /硬盘读写速度 @Cacheable("a")注解的意义就是把该方法的查询结果放到redis中去, 下一次再发起查询就去redis中去取,存在redis中的数据的key就是a; @CacheEvict(value={"a","b"},allEntries=true) 的意思就是 执行该方法后要清除redis中key名称为a,b的数据;

如下示例:

@Cacheable("testMethod") //标注该方法查询的结果进入缓存,再次访问时直接读取缓存中的数据 public String testMethod(){ return "123456"; } @CacheEvict(value= {"testMethod"},allEntries=true) public void deleteRedis() { }
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