이 기사에서는 Spring의 Redis Cache 통합과 주석 형식(@Cacheable, @CachePut, @CacheEvict)을 주로 소개합니다. 관심 있는 분은 더 자세히 알아볼 수 있습니다.
maven 프로젝트는 pom.xml에 있는 2개의 jar 패키지에 의존하며 다른 spring jar 패키지는 생략됩니다.
<dependency> <groupId>redis.clients</groupId> <artifactId>jedis</artifactId> <version>2.8.1</version> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>1.7.2.RELEASE</version> </dependency>
spring-Redis.xml의 콘텐츠:
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-4.2.xsd">
<context:property-placeholder location="classpath:redis-config.properties" />
<!-- 启用缓存注解功能，这个是必须的，否则注解不会生效，另外，该注解一定要声明在spring主配置文件中才会生效 -->
<cache:annotation-driven cache-manager="cacheManager" />
<!-- redis 相关配置 -->
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="${redis.maxIdle}" />
<property name="maxWaitMillis" value="${redis.maxWait}" />
<property name="testOnBorrow" value="${redis.testOnBorrow}" />
</bean>
<bean id="JedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}" p:pool-config-ref="poolConfig"/>
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory" ref="JedisConnectionFactory" />
</bean>
<!-- spring自己的缓存管理器，这里定义了缓存位置名称 ，即注解中的value -->
<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
<property name="caches">
<set>
<!-- 这里可以配置多个redis -->
<!-- <bean class="com.cn.util.RedisCache">
<property name="redisTemplate" ref="redisTemplate" />
<property name="name" value="default"/>
</bean> -->
<bean class="com.cn.util.RedisCache">
<property name="redisTemplate" ref="redisTemplate" />
<property name="name" value="common"/>
<!-- common名称要在类或方法的注解中使用 -->
</bean>
</set>
</property>
</bean>
</beans>Contents redis-config.properties:
# Redis settings # server IP redis.host=127.0.0.1 # server port redis.port=6379 # server pass redis.pass= # use dbIndex redis.database=0 # 控制一个pool最多有多少个状态为idle(空闲的)的jedis实例 redis.maxIdle=300 # 表示当borrow(引入)一个jedis实例时，最大的等待时间，如果超过等待时间(毫秒)，则直接抛出JedisConnectionException； redis.maxWait=3000 # 在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的 redis.testOnBorrow=true
com.cn.util.RedisCache 클래스의 내용:
package com.cn.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.springframework.cache.Cache;
import org.springframework.cache.support.SimpleValueWrapper;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
public class RedisCache implements Cache{
private RedisTemplate<String, Object> redisTemplate;
private String name;
public RedisTemplate<String, Object> getRedisTemplate() {
return redisTemplate;
}
public void setRedisTemplate(RedisTemplate<String, Object> redisTemplate) {
this.redisTemplate = redisTemplate;
}
public void setName(String name) {
this.name = name;
}
@Override
public String getName() {
// TODO Auto-generated method stub
return this.name;
}
@Override
public Object getNativeCache() {
// TODO Auto-generated method stub
return this.redisTemplate;
}
@Override
public ValueWrapper get(Object key) {
// TODO Auto-generated method stub
System.out.println("get key");
final String keyf = key.toString();
Object object = null;
object = redisTemplate.execute(new RedisCallback<Object>() {
public Object doInRedis(RedisConnection connection)
throws DataAccessException {
byte[] key = keyf.getBytes();
byte[] value = connection.get(key);
if (value == null) {
return null;
}
return toObject(value);
}
});
return (object != null ? new SimpleValueWrapper(object) : null);
}
@Override
public void put(Object key, Object value) {
// TODO Auto-generated method stub
System.out.println("put key");
final String keyf = key.toString();
final Object valuef = value;
final long liveTime = 86400;
redisTemplate.execute(new RedisCallback<Long>() {
public Long doInRedis(RedisConnection connection)
throws DataAccessException {
byte[] keyb = keyf.getBytes();
byte[] valueb = toByteArray(valuef);
connection.set(keyb, valueb);
if (liveTime > 0) {
connection.expire(keyb, liveTime);
}
return 1L;
}
});
}
private byte[] toByteArray(Object obj) {
byte[] bytes = null;
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(obj);
oos.flush();
bytes = bos.toByteArray();
oos.close();
bos.close();
}catch (IOException ex) {
ex.printStackTrace();
}
return bytes;
}
private Object toObject(byte[] bytes) {
Object obj = null;
try {
ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bis);
obj = ois.readObject();
ois.close();
bis.close();
} catch (IOException ex) {
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
return obj;
}
@Override
public void evict(Object key) {
// TODO Auto-generated method stub
System.out.println("del key");
final String keyf = key.toString();
redisTemplate.execute(new RedisCallback<Long>() {
public Long doInRedis(RedisConnection connection)
throws DataAccessException {
return connection.del(keyf.getBytes());
}
});
}
@Override
public void clear() {
// TODO Auto-generated method stub
System.out.println("clear key");
redisTemplate.execute(new RedisCallback<String>() {
public String doInRedis(RedisConnection connection)
throws DataAccessException {
connection.flushDb();
return "ok";
}
});
}
@Override
public <T> T get(Object key, Class<T> type) {
// TODO Auto-generated method stub
return null;
}
@Override
public ValueWrapper putIfAbsent(Object key, Object value) {
// TODO Auto-generated method stub
return null;
}
}이 시점에서 대부분의 사람들은 web.xml Spring-redis.xml을 사용하기를 원할 것입니다. 시작 구성 파일(context-param)에 추가되었습니다. 프로젝트가 시작될 때 이 구성 파일이 로드되도록 하세요. 그러나 시작 후에는 주석이 적용되지 않습니다.
올바른 접근 방식은 web.xml에서 서블릿 컨트롤러를 구성하는 것입니다.
<servlet> <servlet-name>SpringMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> <async-supported>true</async-supported> </servlet>
DispatcherServlet 초기화 프로세스 중에 프레임워크는 웹의 WEB-INF 폴더에 있습니다. application spring-mvc.xml이라는 구성 파일을 찾으세요. 지정하지 않은 경우 기본값은 applicationContext.xml
입니다. spring-mvc.xml 파일에 spring-redis 구성 파일을 추가하세요. spring-redis.xml의 활성화 주석에 따르면
spring-mvc.xml 콘텐츠, spring과 spring MVC를 통합하는 부분 생략:
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
<!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->
<context:component-scan base-package="com.cn" />
<!-- 引入同文件夹下的redis属性配置文件 -->
<import resource="spring-redis.xml"/>
</beans>서비스 구현 클래스 내:
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserBo userBo;
@Cacheable(value="common",key="'id_'+#id")
public User selectByPrimaryKey(Integer id) {
return userBo.selectByPrimaryKey(id);
}
@CachePut(value="common",key="#user.getUserName()")
public void insertSelective(User user) {
userBo.insertSelective(user);
}
@CacheEvict(value="common",key="'id_'+#id")
public void deleteByPrimaryKey(Integer id) {
userBo.deleteByPrimaryKey(id);
}
}위 내용은 Spring이 Redis Cache를 통합하여 Annotation 형태로 활용하는 사례에 대한 자세한 설명의 상세 내용입니다. 자세한 내용은 PHP 중국어 웹사이트의 기타 관련 기사를 참조하세요!
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