springboot + redis 案例

pom及配置

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.1.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>youmei</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>youmei</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.1.1</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>tk.mybatis</groupId>
			<artifactId>mapper</artifactId>
			<version>4.1.5</version>
		</dependency>
		<dependency>
			<groupId>tk.mybatis</groupId>
			<artifactId>mapper-spring-boot-starter</artifactId>
			<version>2.1.5</version>
		</dependency>
		<!-- 分頁 -->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper</artifactId>
			<version>5.0.4</version>
		</dependency>
		<!-- redis -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-redis</artifactId>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

#tomcat
server.port=8088
#鏈接數據庫
spring.datasource.url=jdbc:mysql://47.95.6.64/o2o?useUnicode=true&characterEncoding=utf8
spring.datasource.username=SongDaYe
spring.datasource.password=Rui@hao521
spring.datasource.driverClassName=com.mysql.jdbc.Driver
#Mybatis映射文件
mybatis.mapper-locations=classpath*:mapper/*.xml
# Redis數據庫索引（默認爲0）  
spring.redis.database=0
# Redis服務器地址  
spring.redis.host=127.0.0.1
# Redis服務器連接端口  
spring.redis.port=6379
# Redis服務器連接密碼（默認爲空）  
spring.redis.password=song
# 連接池最大連接數（使用負值表示沒有限制）  
spring.redis.pool.max-active=200
# 連接池最大阻塞等待時間（使用負值表示沒有限制）  
spring.redis.pool.max-wait=-1
# 連接池中的最大空閒連接  
spring.redis.pool.max-idle=10
# 連接池中的最小空閒連接  
spring.redis.pool.min-idle=0
# 連接超時時間（毫秒）  
spring.redis.timeout=1000

redis配置類

package com.youmei.sh.config;
import org.springframework.cache.CacheManager;

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.RedisCacheConfiguration;

import org.springframework.data.redis.cache.RedisCacheManager;

import org.springframework.data.redis.cache.RedisCacheWriter;

import org.springframework.data.redis.connection.RedisConnectionFactory;

import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;

import org.springframework.data.redis.serializer.RedisSerializationContext;

import org.springframework.data.redis.serializer.RedisSerializer;

import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.lang.reflect.Method;

import java.time.Duration;

@Configuration

@EnableCaching

public class CachingConfig extends CachingConfigurerSupport {

    private RedisSerializer<String> keySerializer() {

        return new StringRedisSerializer();

    }

    //使用Jackson序列化器

    private RedisSerializer<Object> valueSerializer() {

        return new GenericJackson2JsonRedisSerializer();

    }

    @Bean

    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {

        //緩存配置對象

        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();

        redisCacheConfiguration = redisCacheConfiguration.entryTtl(Duration.ofMinutes(30L)) //設置緩存的默認超時時間：30分鐘

                .disableCachingNullValues()             //如果是空值，不緩存

                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(keySerializer()))         //設置key序列化器

                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer((valueSerializer())));  //設置value序列化器

        return RedisCacheManager

                .builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))

                .cacheDefaults(redisCacheConfiguration).build();

    }

    @Override

    @Bean

    public KeyGenerator keyGenerator() {

        // TODO Auto-generated method stub

        return new KeyGenerator() {

            @Override

            public Object generate(Object object, Method method, Object... objects) {

                // TODO Auto-generated method stub

                StringBuilder sb = new StringBuilder();

                sb.append(object.getClass().getName());

                sb.append(method.getName());

                for (Object obj : objects) {

                    if (obj != null) {

                        sb.append(obj.toString());

                    }

                }

                return sb.toString();

            }

        };

    }

}

啓動類

package com.youmei.sh;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.ConfigurableApplicationContext;

import com.youmei.sh.config.CachingConfig;
import com.youmei.sh.config.RedisConfig;

import tk.mybatis.spring.annotation.MapperScan;
@SpringBootApplication
@MapperScan("com.youmei.sh.mapper")
public class YoumeiApplication {

	public static void main(String[] args) {
		SpringApplication.run(YoumeiApplication.class, args);
	}

}

以上爲主要配置。

基本註解

 *  @Cacheable註解的作用：緩存被調用方法的結果（返回值），已經緩存就不再調用註解修飾的方法，適用於查詢接口
 *  @CachePut註解適用於更新操作和插入操作
 *  @CacheEvict註解的作用：刪除redis中對應的緩存，適用於刪除接口