spring integrates redis cache and USES of @Cacheable @CachePut @CacheEvict annotations
- 2020-07-21 08:02:02
- OfStack
maven project relies on 2 jar packages in ES2en.xml, the jar packages of the other spring are omitted:
<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. Contents of 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: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" />
<!-- Enable cache annotations, this is necessary, otherwise the annotations will not take effect, in addition, the annotations 1 Be sure to declare in spring In the master configuration file -->
<cache:annotation-driven cache-manager="cacheManager" />
<!-- redis The related configuration -->
<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 Its own cache manager, where the cache location name is defined In the annotations value -->
<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
<property name="caches">
<set>
<!-- Multiple configurations can be configured here 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 The name is used in the annotation of the class or method -->
</bean>
</set>
</property>
</bean>
</beans>
redis-config. Contents of 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
# control 1 a pool How many states can I have at most idle( free ) the jedis The instance
redis.maxIdle=300
# Said when borrow( The introduction of )1 a jedis Instance, the maximum wait time if the wait time exceeds ( ms ) , then simply throw JedisConnectionException ;
redis.maxWait=3000
# in borrow1 a jedis Instance, whether to proceed ahead of time validate Operation; If it is true , you get jedis Examples are available
redis.testOnBorrow=true
com. cn. util. RedisCache the contents of the class:
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;
}
}
At this stage, most people would like to add spring-ES34en.xml to the startup profile of ES29en.xml (ES31en-ES32en) and have the profile load when the project starts, but the annotation doesn't take effect.
The correct approach is: ES39en. xml with servlet controller:
<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>
During the initialization of DispatcherServlet, the framework looks for a configuration file named spring-ES50en.xml in the ES47en-ES48en folder of web application. If not specified, the default is ES52en.xml
Simply introduce the ES60en-ES61en profile in the ES57en-ES58en.xml file, as stated in the enabling annotation in ES62en-ES63en.xml:
<
cache:annotation-driven cache-manager="cacheManager" /
>
Note 1 must be declared in the spring master configuration file to take effect.
spring-mvc.xml content, omit the part integrating spring and spring MVC:
<?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">
<!-- Automatically scan the package to make SpringMVC I think it's in the bag @controller The annotated class is the controller -->
<context:component-scan base-package="com.cn" />
<!-- Bring in the same folder redis Property profile -->
<import resource="spring-redis.xml"/>
</beans>
In the service implementation class:
@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);
}
}