Maven中Spring-Data-Redis存储对象(redisTemplate)

Redis是一种nosql数据库，在开发中常用做缓存。Jedis是Redis在java中的redis- client.在此之前，希望已经了解redis的基本使用和Maven的使用。建立Maven Project之后，在POM.xml中添加jedis和spring-data-redis的依赖如下：

<dependency>

	<groupId>redis.clients</groupId>

	<artifactId>jedis</artifactId>

	<version>2.0.0</version>

	<type>jar</type>

	<scope>compile</scope>

</dependency>

<!-- spring-redis -->

<dependency>

	<groupId>org.springframework.data</groupId>

	<artifactId>spring-data-redis</artifactId>

	<version>1.0.0.RELEASE</version>

</dependency>

　　Redis连接数据库参数如下：applicationContext-redis.properties

#redis config

redis.pool.maxActive=100

redis.pool.maxIdle=20

redis.pool.maxWait=1000

redis.pool.testOnBorrow=true

redis.hostname=localhost

redis.port=6379

redis.password=

　　在上下文配置中使用key-value读取方式读取properties中的值：

<!-- Jedis 连接池配置-->

<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">

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

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

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

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

</bean>

<!-- Jedis ConnectionFactory 数据库连接配置-->

<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">

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

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

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

	<property name="poolConfig" ref="jedisPoolConfig" />

</bean>

<!—- redisTemplate配置，redisTemplate是对Jedis的对redis操作的扩展，有更多的操作，封装使操作更便捷 -->

<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"                                   p:connection-factory-ref="jedisConnectionFactory" />

上面redisTemplate已经基本配置完成。

接下来创建User类，必须实现或者间接实现Serializable接口：

Redis存储对象是使用序列化，spring-data-redis已经将序列化的功能内置，不需要我们去管，我们只需要调用api就可以使用。SerialVersionUID字段对序列化扩展有用，为了以后扩展或者缩减字段时不会造成反序列化出错。

public class User implements Serializable {

	private static final long serialVersionUID = -7898194272883238670L;

	public static final String OBJECT_KEY = "USER";

	public User() {

	}

	public User(String id) {

	}

	public User(String id, String name) {

		this.id = id;

		this.name = name;

	}

	private String id;

	private String name;

	public String getId() {

		return id;

	}

	public void setId(String id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public String toString() {

		return "User [id=" + id + ", name=" + name + "]";

	}

	public String getKey() {

		return getId();

	}

	public String getObjectKey() {

		return OBJECT_KEY;

	}

}

　　创建userService类来操作redis增删查改缓存对象。

public class UserService {

	RedisTemplate<String, User> redisTemplate;

	public RedisTemplate<String, User> getRedisTemplate() {

		return redisTemplate;

	}

	public void setRedisTemplate(RedisTemplate<String, User> redisTemplate) {

		this.redisTemplate = redisTemplate;

	}

	public void put(User user) {

		redisTemplate.opsForHash().put(user.getObjectKey(), user.getKey(), user);

	}

	public void delete(User key) {

		redisTemplate.opsForHash().delete(key.getObjectKey(), key.getKey());

	}

	public User get(User key) {

		return (User) redisTemplate.opsForHash().get(key.getObjectKey(), key.getKey());

	}

}

　　在上下文中配置redisTemplate注入，在使用bean方式来注入时，redisTemplate必须有setter/getter方法：

<bean id="userService" class="Service.UserService">

	<property name="redisTemplate">

		<ref bean="redisTemplate" />

	</property>

</bean>

　　======如果使用注解方式自动注入，则可以注释掉上面的bean配置方式======

在UserService注解@Service(“userService”),也可以在Service里写名字，默认是第一字母小写。

@Service("userService")

public class UserService {

	@Autowired

	RedisTemplate<String, User> redisTemplate;

	……

        ……

}

　　在上下文配置文件中，添加自动扫描包的context节点，Base-package的路径要覆盖包含注解的类文件：

<context:component-scan base-package="*" />

　　在main中来简单操作一下：

public class Main {

	public static void main( String[] args )

	{

		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath*:/conf/applicationContext.xml"		);

		UserService userService =  (UserService) applicationContext.getBean("userService");

		User user1 = new User("user1ID", "User 1");

		User user2 = new User("user2ID", "User 2");

		System.out.println("==== getting objects from redis ====");

		System.out.println("User is not in redis yet: " + userService.get(user1));

		System.out.println("User is not in redis yet: " + userService.get(user2));

		System.out.println("==== putting objects into redis ====");

		userService.put(user1);

		userService.put(user2);

		System.out.println("==== getting objects from redis ====");

		System.out.println("User should be in redis yet: " + userService.get(user1));

		System.out.println("User should be in redis yet: " + userService.get(user2));

		System.out.println("==== deleting objects from redis ====");

		userService.delete(user1);

		userService.delete(user2);

		System.out.println("==== getting objects from redis ====");

		System.out.println("User is not in redis yet: " + userService.get(user1));

		System.out.println("User is not in redis yet: " + userService.get(user2));

	}

}

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Maven中Spring-Data-Redis存储对象(redisTemplate)

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