1, 项目实在springboot 集成mybatis 的基础上的:
https://www.cnblogs.com/pickKnow/p/11189729.html
2,pom 如下,有的不需要加,只需要加下ehcache 相关就行
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.0.RELEASE</version> </parent> <dependencies> <!-- SpringBoot 对lombok 支持 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> <!-- SpringBoot web 核心组件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </dependency> <!-- SpringBoot 外部tomcat支持 --> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> </dependency> <!-- springboot-log4j --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-log4j</artifactId> <version>1.3.8.RELEASE</version> </dependency> <!-- springboot-aop 技术 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/commons-lang/commons-lang --> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.6</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> <!--开启 cache 缓存 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency> <!-- ehcache缓存 --> <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache</artifactId> <version>2.9.1</version><!--$NO-MVN-MAN-VER$ --> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.1.1</version> </dependency> <!-- mysql 依赖 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> </dependencies>
3,需要缓存的方法上加上注解
@Cacheable 在类上给缓存加上名字
@CacheConfig(cacheNames = "userCache")
package com.aiyuesheng.mapper; import org.springframework.cache.annotation.CacheConfig; import org.springframework.cache.annotation.Cacheable; import com.aiyuesheng.entity.User; @CacheConfig(cacheNames = "userCache") public interface UserMapperdb { void insertUser(User user); @Cacheable User selectUserById(int id); }
4,启动类上加上读取缓存
@EnableCaching @MapperScan("com.aiyuesheng.mapper") @SpringBootApplication public class App { public static void main(String[] args) { SpringApplication.run(App.class, args); } }
5,设置了缓存的名字userCache,那么这个缓存的参数在哪里?
在配置文件:ehcache.xml
<?xml version="1.0" encoding="UTF-8"?> <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"> <!-- 指定一个文件目录,当EhCache把数据写到硬盘上时,将把数据写到这个文件目录下 --> <diskStore path="java.io.tmpdir" /> <!-- userCache缓存 --> <cache name="userCache" maxElementsInMemory="1000" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" diskSpoolBufferSizeMB="30" maxElementsOnDisk="10000000" diskPersistent="false" diskExpiryThreadIntervalSeconds="120" memoryStoreEvictionPolicy="LRU"> </cache> </ehcache>
6,在application.yml 定义去读取这个文件
#单数据源 spring: datasource: url: jdbc:mysql://127.0.0.1:3306/testdb username: root password: 123456 driver-class-name: com.mysql.jdbc.Driver mybatis: mapper-locations: classpath:com/aiyuesheng/mapping/*Mapper.xml type-aliases-package: com.aiyuesheng.entity # 缓存配置读取 cache: type: ehcache ehcache: config: classpath:ehcache.xml
7,配置OK ,缓存里面有数据,他就会读取缓存里面的值。
8,配置信息解读
<diskStore path="java.io.tmpdir" /> 指定数据(.data and .index)存储位置,可指定磁盘中的文件夹位置期
<cache name="userCache" Cache的名称,必须是唯一的(ehcache会把这个cache放到HashMap里)。
maxElementsInMemory="1000" 在内存中缓存的element的最大数目
eternal="false" 设定缓存的elements是否永远不过期。如果为true,则缓存的数据始终有效,如果为false那么还要根据timeToIdleSeconds,timeToLiveSeconds判断。 timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" 如果内存中数据超过内存限制,是否要缓存到磁盘上。 diskSpoolBufferSizeMB="30" maxElementsOnDisk="10000000" diskPersistent="false" 否在磁盘上持久化。指重启jvm后,数据是否有效。默认为false。 diskExpiryThreadIntervalSeconds="120" 对象检测线程运行时间间隔。标识对象状态的线程多长时间运行一次。 memoryStoreEvictionPolicy="LRU"> 缓存策略。默认值LRU,可选FIFO、LFU。
原文地址:https://www.cnblogs.com/pickKnow/p/11290732.html
时间: 2024-11-05 20:34:22