java之redis篇(spring-data-redis整合)，

2，context:component-scan 是为了在com.x.redis.dao报下的类能够实用spring的注解注入的方式。

3，事实上我们只需要把JedisPoolConfig配数来就好了，接下来就是spring的封装了。所以直接看UserDAOImpl的实现就明白了。

<?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:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    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">  
  
    <context:property-placeholder location="classpath:redis.properties" />  
    <context:component-scan base-package="com.x.redis.dao">
    </context:component-scan>
    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">  
        <property name="maxIdle" value="${redis.maxIdle}" />  
        <property name="maxActive" value="${redis.maxActive}" />  
        <property name="maxWait" value="${redis.maxWait}" />  
        <property name="testOnBorrow" value="${redis.testOnBorrow}" />  
    </bean>  
      
    <bean id="connectionFactory" 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.StringRedisTemplate">  
        <property name="connectionFactory"   ref="connectionFactory" />  
    </bean>         
      
    <bean id="userDAO" class="com.x.redis.dao.impl.UserDAOImpl" />   
</beans> 

redis.properties：

UserDAOImpl：

1，spring对dao层的封装很多用了类似于下面代码的模板方式。

2，RedisTemplate就是spring对redis的一个封装而已。

public class UserDAOImpl implements UserDAO {

    @Autowired
    protected RedisTemplate<Serializable, Serializable> redisTemplate;

    public void saveUser(final User user) {
        redisTemplate.execute(new RedisCallback<Object>() {

            @Override
            public Object doInRedis(RedisConnection connection) throws DataAccessException {
                connection.set(redisTemplate.getStringSerializer().serialize("user.uid." + user.getId()),
                               redisTemplate.getStringSerializer().serialize(user.getName()));
                return null;
            }
        });
    }

    @Override
    public User getUser(final long id) {
        return redisTemplate.execute(new RedisCallback<User>() {
            @Override
            public User doInRedis(RedisConnection connection) throws DataAccessException {
                byte[] key = redisTemplate.getStringSerializer().serialize("user.uid." + id);
                if (connection.exists(key)) {
                    byte[] value = connection.get(key);
                    String name = redisTemplate.getStringSerializer().deserialize(value);
                    User user = new User();
                    user.setName(name);
                    user.setId(id);
                    return user;
                }
                return null;
            }
        });
    }

}

其他：

User：

测试代码：

    public static void main(String[] args) {
        ApplicationContext ac =  new ClassPathXmlApplicationContext("classpath:/applicationContext.xml");
        UserDAO userDAO = (UserDAO)ac.getBean("userDAO");
        User user1 = new User();
        user1.setId(1);
        user1.setName("obama");
        userDAO.saveUser(user1);
        User user2 = userDAO.getUser(1);
        System.out.println(user2.getName());
    }

2，不利用spring-data-redis整合

个人觉得这样整合灵活度更大，能够更加明了的完成任务。

pom.xml:

目录结构：

data-source.xml

1，context:property-placeholder 和 context:component-scan 前面解释过啦。

2，配置了一个ShardedJedisPool，在jdeis里 还有个JedisPool。这两个的区别:

<?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:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    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">  

    <context:property-placeholder location="classpath:redis.properties" />  
    <context:component-scan base-package="com.d.work.main">
    </context:component-scan>
        <context:component-scan base-package="com.d.work.redis">
    </context:component-scan>
    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxActive" value="50" />
        <property name="maxIdle" value="8" />
        <property name="maxWait" value="1000" />
        <property name="testOnBorrow" value="true"/>
        <property name="testOnReturn" value="true"/>
        <!-- <property name="testWhileIdle" value="true"/> -->
    </bean>

    <bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool"  scope="singleton">
        <constructor-arg index="0" ref="jedisPoolConfig" />
        <constructor-arg index="1">
            <list>
                <bean class="redis.clients.jedis.JedisShardInfo">
                    <constructor-arg name="host" value="${redis.host}" />
                    <constructor-arg name="port" value="${redis.port}" />
                    <constructor-arg name="timeout" value="${redis.timeout}" />
                    <constructor-arg name="weight" value="1" />
                </bean>
            </list>
        </constructor-arg>
    </bean>
</beans>

RedisDataSource:定义三个方法

public interface RedisDataSource {
    public abstract ShardedJedis getRedisClient();
    public void returnResource(ShardedJedis shardedJedis);
    public void returnResource(ShardedJedis shardedJedis,boolean broken);
}

实现redisDataSource:

1, 注入配置好的ShardedJedisPool，这三个方法的作用：

getRedisClient() ： 取得redis的客户端，可以执行命令了。

returnResource(ShardedJedis shardedJedis) ： 将资源返还给pool

returnResource(ShardedJedis shardedJedis, boolean broken) : 出现异常后，将资源返还给pool （其实不需要第二个方法）

@Repository("redisDataSource")
public class RedisDataSourceImpl implements RedisDataSource {

    private static final Logger log = LoggerFactory.getLogger(RedisDataSourceImpl.class);

    @Autowired
    private ShardedJedisPool    shardedJedisPool;

    public ShardedJedis getRedisClient() {
        try {
            ShardedJedis shardJedis = shardedJedisPool.getResource();
            return shardJedis;
        } catch (Exception e) {
            log.error("getRedisClent error", e);
        }
        return null;
    }

    public void returnResource(ShardedJedis shardedJedis) {
        shardedJedisPool.returnResource(shardedJedis);
    }

    public void returnResource(ShardedJedis shardedJedis, boolean broken) {
        if (broken) {
            shardedJedisPool.returnBrokenResource(shardedJedis);
        } else {
            shardedJedisPool.returnResource(shardedJedis);
        }
    }
}

第二层的封装：RedisClientTemplate，例子实现了放值和取值。最后代码提供了全部命令的实现。

代码就是映射性质的又一次调用jedis的方法而已，用了个broken来做标示符，决定返还资源的方式。

这一层的目的主要也是让再上层的调用不需要关心pool中链接的取得和返还问题了。

@Repository("redisClientTemplate")
public class RedisClientTemplate {

    private static final Logger log = LoggerFactory.getLogger(RedisClientTemplate.class);

    @Autowired
    private RedisDataSource     redisDataSource;

    public void disconnect() {
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        shardedJedis.disconnect();
    }

    /**
     * 设置单个值
     * 
     * @param key
     * @param value
     * @return
     */
    public String set(String key, String value) {
        String result = null;

        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }
        boolean broken = false;
        try {
            result = shardedJedis.set(key, value);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }

    /**
     * 获取单个值
     * 
     * @param key
     * @return
     */
    public String get(String key) {
        String result = null;
        ShardedJedis shardedJedis = redisDataSource.getRedisClient();
        if (shardedJedis == null) {
            return result;
        }

        boolean broken = false;
        try {
            result = shardedJedis.get(key);

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            broken = true;
        } finally {
            redisDataSource.returnResource(shardedJedis, broken);
        }
        return result;
    }
}

测试代码：

    public static void main(String[] args) {
        ApplicationContext ac =  new ClassPathXmlApplicationContext("classpath:/data-source.xml");
        RedisClientTemplate redisClient = (RedisClientTemplate)ac.getBean("redisClientTemplate");
        redisClient.set("a", "abc");
        System.out.println(redisClient.get("a"));
    }

附上RedisClientTemplate全部实现：