- 概述
- 示例
- 项目结构
- 数据库表数据Oracle
- 实体类
- 服务层
- Spring配置文件
- 单元测试
- 日志输出
- 日志分析
- 示例源码
概述
Spring Cache基于注解的配置
如果不想使用注解或者由于其他原因无法获得项目的源码等,Spring也支持使用XML的方式配置Spring Cache,主要是通过类似于aop:advice的cache:advice来进行的。
在cache命名空间下定义了一个cache:advice元素用来定义一个对于Cache的advice。其需要指定一个cache-manager属性,默认为cacheManager。
cache:advice下面可以指定多个cache:caching元素,其有点类似于使用注解时的@Caching注解。
cache:caching元素下又可以指定cache:cacheable、cache:cache-put和cache:cache-evict元素,它们类似于使用注解时的@Cacheable、@CachePut和@CacheEvict。
示例
项目结构:
数据库表数据(Oracle):
实体类
代码语言:javascript复制package com.xgj.cache.springCacheXml.domain;
import java.io.Serializable;
/**
*
*
* @ClassName: LittleArtisan
*
* @Description: Java中的缓存和序列化是息息相关的,注意实现Serializable接口
*
* @author: Mr.Yang
*
* @date: 2017年10月2日 下午1:40:53
*/
public class LittleArtisan implements Serializable {
private static final long serialVersionUID = 1L;
private String artisanId;
private String artisanName;
private String artisanDesc;
public String getArtisanId() {
return artisanId;
}
public void setArtisanId(String artisanId) {
this.artisanId = artisanId;
}
public String getArtisanName() {
return artisanName;
}
public void setArtisanName(String artisanName) {
this.artisanName = artisanName;
}
public String getArtisanDesc() {
return artisanDesc;
}
public void setArtisanDesc(String artisanDesc) {
this.artisanDesc = artisanDesc;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
}
服务层
代码语言:javascript复制package com.xgj.cache.springCacheXml.service;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;
import com.xgj.cache.springCacheXml.domain.LittleArtisan;
/**
*
*
* @ClassName: LittleArtisanSpringCacheService
*
* @Description:
*
* @author: Mr.Yang
*
* @date: 2017年10月4日 上午12:41:32
*/
public class LittleArtisanSpringCacheService {
private Logger logger = Logger
.getLogger(LittleArtisanSpringCacheService.class);
private static final String selectArtisanSQL = "select artisan_id ,artisan_name ,artisan_desc from little_artisan where artisan_name = ?";
private JdbcTemplate jdbcTemplate;
@Autowired
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
/**
*
*
* @Title: getArtisan
*
* @Description: getArtisan 通过在xml中配置 缓存数据
*
* @param artisanName
* @return
*
* @return: LittleArtisan
*/
public LittleArtisan getArtisan(String artisanName) {
// 方法内部实现不考虑缓存逻辑,直接实现业务
System.out.println("查找Artisan:" artisanName);
return getFromDB(artisanName);
}
/**
*
*
* @Title: reloadArtisan
*
* @Description: 清除缓存
*
*
* @return: void
*/
public void reloadArtisan() {
System.out.println("cache cleared");
}
/**
*
*
* @Title: getFromDB
*
* @Description: 从数据库中获取LittleArtisan
*
* @param artisanName
* @return
*
* @return: LittleArtisan
*/
private LittleArtisan getFromDB(String artisanName) {
System.out.println("getFromDB");
final LittleArtisan littleArtisan = new LittleArtisan();
jdbcTemplate.query(selectArtisanSQL, new Object[] { artisanName },
new RowCallbackHandler() {
@Override
public void processRow(ResultSet rs) throws SQLException {
littleArtisan.setArtisanId(rs.getString("artisan_id"));
littleArtisan.setArtisanName(rs
.getString("artisan_name"));
littleArtisan.setArtisanDesc(rs
.getString("artisan_desc"));
}
});
return littleArtisan;
}
}
Spring配置文件
代码语言:javascript复制<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache.xsd">
<context:component-scan base-package="com.xgj.cache.springCacheXml"/>
<context:property-placeholder location="classpath:spring/jdbc.properties" />
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close"
p:driverClassName="${jdbc.driverClassName}"
p:url="${jdbc.url}"
p:username="${jdbc.username}"
p:password="${jdbc.password}" />
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg ref="dataSource"/>
bean>
<bean id="littleArtisanSpringCacheService" class="com.xgj.cache.springCacheXml.service.LittleArtisanSpringCacheService"/>
<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
<property name="caches">
<set>
<bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean" p:name="littleArtisan"/>
set>
property>
bean>
<cache:advice id="cacheAdvice" cache-manager="cacheManager" >
<cache:caching cache="littleArtisan">
<cache:cacheable method="getArtisan" key="#artisanName"/>
<cache:cache-evict method="reloadArtisan" all-entries="true"/>
cache:caching>
cache:advice>
<aop:config>
<aop:pointcut id="cachePoint" expression="execution(* com.xgj.cache.springCacheXml.service.LittleArtisanSpringCacheService.*(..))" />
<aop:advisor advice-ref="cacheAdvice"
pointcut-ref="cachePoint"/>
aop:config>
beans>
单元测试
代码语言:javascript复制package com.xgj.cache.springCacheXml.service;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.xgj.cache.springCacheXml.domain.LittleArtisan;
public class TestXmlCache {
ClassPathXmlApplicationContext context = null;
LittleArtisanSpringCacheService service = null;
LittleArtisan littleArtisan;
@Before
public void initContext() {
// 启动Spring 容器
context = new ClassPathXmlApplicationContext(
"classpath:com/xgj/cache/springCacheXml/conf_spring.xml");
}
@Test
public void testXmlCache() {
service = context.getBean(
"littleArtisanSpringCacheService",
LittleArtisanSpringCacheService.class);
// 第一次 从数据库加载
littleArtisan = service.getArtisan("masterArtisan");
printArtisan();
// 第二次 从缓存加载
littleArtisan = service.getArtisan("masterArtisan");
printArtisan();
// 清空缓存
service.reloadArtisan();
// 再次查询,从数据库加载
service.getArtisan("masterArtisan");
printArtisan();
// 又查询,从缓存加载
service.getArtisan("masterArtisan");
printArtisan();
}
private void printArtisan() {
System.out.println(littleArtisan.getArtisanName() "||"
littleArtisan.getArtisanDesc());
}
@After
public void releaseContext() {
if (context != null) {
context.close();
}
}
}
日志输出
代码语言:javascript复制2017-10-04 08:40:00,529 INFO [main] (AbstractApplicationContext.java:583) - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@403d0d64: startup date [Wed Oct 04 08:40:00 BOT 2017]; root of context hierarchy
2017-10-04 08:40:00,623 INFO [main] (XmlBeanDefinitionReader.java:317) - Loading XML bean definitions from class path resource [com/xgj/cache/springCacheXml/conf_spring.xml]
查找Artisan:masterArtisan
getFromDB
masterArtisan||Spring Cache
masterArtisan||Spring Cache
cache cleared
查找Artisan:masterArtisan
getFromDB
masterArtisan||Spring Cache
masterArtisan||Spring Cache
2017-10-04 08:40:03,433 INFO [main] (AbstractApplicationContext.java:984) - Closing org.springframework.context.support.ClassPathXmlApplicationContext@403d0d64: startup date [Wed Oct 04 08:40:00 BOT 2017]; root of context hierarchy
日志分析
第一次从数据库中加载,第二次没有打印getFromDB,说明是从缓存中取的数据。 然后清空缓存,第一次从数据库中加载,第二次从缓存中取的数据。
示例源码
代码已托管到Github—> https://github.com/yangshangwei/SpringMaster