spring集成redis(单节点)

妖狐艹你老母 2022-05-22 11:11 274阅读 0赞

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][https_github.com_MSOpenTech_redis_releases]。

这里是redis相关的教程。[http://muxiulin.cn/archives/1197][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>
       <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>
    
           <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>
    
           <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> <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>
                   <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>
    
    
        <bean id="propertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
          <property name="locations">
             <list>
                <value>classpath*:/redis.properties</value>
             </list>
          </property>
       </bean>
    
        <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
           <property name="maxIdle" value="${redis.maxIdle}" />
           <property name="maxTotal" value="${redis.maxActive}" />
           <property name="maxWaitMillis" value="${redis.maxWait}" />
           <property name="testOnBorrow" value="${redis.testOnBorrow}" />
           <property name="minEvictableIdleTimeMillis" value="${redis.minEvictableIdleTimeMillis}" />
           <property name="numTestsPerEvictionRun" value="${redis.numTestsPerEvictionRun}" />
           <property name="timeBetweenEvictionRunsMillis" value="${redis.timeBetweenEvictionRunsMillis}" />
       </bean>
    
        <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>
    
        <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>
    
        <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
          <property name="connectionFactory" ref="jedisConnectionFactory" />
           </bean>
    
        <bean id="redisCacheManager" class="org.springframework.data.redis.cache.RedisCacheManager">
          <constructor-arg name="redisOperations" ref="redisTemplate" />
          <property name="defaultExpiration" value="${redis.expiration}" />
       </bean>
    
        <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

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() {
    
    }

[https_github.com_MSOpenTech_redis_releases]: https://github.com/MSOpenTech/redis/releases
[http_muxiulin.cn_archives_1197]: http://muxiulin.cn/archives/1197