认识达内从这里开始

昆明达内培训的老师这一期给大家讲SSH框架和Redis的整合。

一个已有的Struts+Spring+Hibernate项目，以前使用MySQL数据库，现在想把Redis也整合进去。

1.相关Jar文件

下载并导入以下3个Jar文件：

commons-pool2-2.4.2.jar、jedis-2.3.1.jar、spring-data-redis-1.3.4.RELEASE.jar。

2. Redis配置文件

在src文件夹下面新建一个redis.properties文件，设置连接Redis的一些属性。

redis.host=127.0.0.1  

redis.port=6379

redis.default.db=1 

redis.timeout=100000 

redis.maxActive=300 

redis.maxIdle=100 

redis.maxWait=1000 

redis.testOnBorrow=true

再新建一个redis.xml文件。

<?xml version="1.0" encoding="UTF-8"?>  

<beans xmlns="#/schema/beans"  

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  

xmlns:p="#/schema/p"  

xmlns:context="#/schema/context"  

xsi:schemaLocation="#/schema/beans #/schema/beans/spring-beans.xsd  

#/schema/context #/schema/context/spring-context-4.0.xsd"> 

<context:property-placeholder location="classpath:redis.properties"/>

<bean id="propertyConfigurerRedis" 

class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 

<property name="order" value="1" /> 

<property ame="ignoreUnresolvablePlaceholders" value="true" /> 

<property ame="systemPropertiesMode" value="1" /> 

<property ame="searchSystemEnvironment" value="true" /> 

<property ame="locations"> 

<list> 

<value>classpath:redis.properties</value> 

</list> 

</property> 

</bean>

<bean id="jedisPoolConfig" 

class="redis.clients.jedis.JedisPoolConfig"> 

<property name="maxIdle" value="${redis.maxIdle}" /> 

<property ame="testOnBorrow" value="${redis.testOnBorrow}" /> 

</bean>

<bean id="jedisConnectionFactory" 

class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"> 

<property name="usePool" value="true"></property> 

<property name="hostName" value="${redis.host}" /> 

<property name="port" value="${redis.port}" /> 

<property name="timeout" value="${redis.timeout}" /> 

<property name="database" value="${redis.default.db}"></property> 

<constructor-arg index="0" ref="jedisPoolConfig" /> 

</bean>

<bean id="redisTemplate" 

class="org.springframework.data.redis.core.StringRedisTemplate" 

p:connectionFactory-ref="jedisConnectionFactory" 

> 

</bean>

<bean id="redisBase" abstract="true"> 

<property name="template" ref="redisTemplate"/> 

</bean>

<context:component-scan base-package="com.school.redisclient" />

</beans>

3. Redis类

新建一个com.school.redisclient包，结构如下：

接口IRedisService：

public interface IRedisService<K, V> {      

public void set(K key, V value, long expiredTime); 

public V get(K key);

public Object getHash(K key, String name);

public void del(K key);          

}

抽象类AbstractRedisService，主要是对RedisTemplate进行操作：

public abstract class AbstractRedisService<K, V> implements IRedisService<K, V> { 

@Autowired 

private RedisTemplate<K, V> redisTemplate; 

public RedisTemplate<K, V> getRedisTemplate() { 

return redisTemplate; 

} 

public void setRedisTemplate(RedisTemplate<K, V> redisTemplate) { 

this.redisTemplate = redisTemplate; 

} 

@Override 

public void set(final K key, final V value, final long expiredTime) { 

BoundValueOperations<K, V> valueOper = redisTemplate.boundValueOps(key); 

if (expiredTime <= 0) { 

valueOper.set(value); 

} else { 

valueOper.set(value, expiredTime, TimeUnit.MILLISECONDS); 

} 

} 

@Override 

public V get(final K key) { 

BoundValueOperations<K, V> valueOper = redisTemplate.boundValueOps(key); 

return valueOper.get(); 

}

@Override

public Object getHash(K key, String ame){

Object res = redisTemplate.boundHashOps(key).get(name);

return res;

}

@Override 

public void del(K key) { 

if (redisTemplate.hasKey(key)) { 

redisTemplate.delete(key); 

} 

}  

}

实现类RedisService：

@Service("redisService") 

public class RedisService extends AbstractRedisService<String, String> { 

}

工具类RedisTool：

public class RedisTool {

private static ApplicationContext factory;

private static RedisService redisService;

public static ApplicationContext getFactory(){

if (factory == null){

factory = new ClassPathXmlApplicationContext("classpath:redis.xml");

}

return factory;

}

public static RedisService getRedisService(){

if (redisService == null){

redisService = (RedisService) getFactory().getBean("redisService");

}       

return redisService;

}

}

4.查询功能的实现

新建一个Action：RClasQueryAction，返回Redis里面所有的课程数据。

@SuppressWarnings("serial")

public class RClasQueryAction extends ActionSupport {

RedisService rs = RedisTool.getRedisService();

List<Clas> claslist = new ArrayList<Clas>();

Clas c;

public String execute(){

if (rs != null){

System.out.println("RedisService : " + rs);

getAllClas();

}

ServletActionContext.getRequest().setAttribute("claslist", claslist);

return SUCCESS;

}

private void getAllClas(){

claslist = new ArrayList<Clas>();       

int num = Integer.parseInt(rs.get("clas:count"));

for (int i=0; i<num; i++){

String cid = "clas:" + (i+1);

c = new Clas();

int id = Integer.parseInt(String.valueOf(rs.getHash(cid, "ID")));

c.setId(id);

System.out.println("ID:" + id);

String name = (String) rs.getHash(cid, "NAME");

c.setName(name);

System.out.println("NAME:" + name);

String comment = (String) rs.getHash(cid, "COMMENT");

c.setComment(comment);

System.out.println("COMMENT:" + comment);

claslist.add(c);

}

}

}

Struts的设置和jsp文件就不详细讲了。

5. Redis数据库

Redis数据库里面的内容（使用的是Redis Desktop Manager）：

最后是运行结果：

当然，这只是实现了从Redis查询数据，还没有实现将Redis作为MySQL的缓存。

了解详情请登陆昆明达内IT培训官网（km.tedu.cn）！