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：

[html] view plain copy print?<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>

<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

[plain] view plain copy print?#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=

#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：

[html] view plain copy print?<!– Jedis 连接池配置–>
<bean id=“jedisPoolConfig” class=“redis.clients.jedis.JedisPoolConfig”>
<property name=“maxActive” value=“{redis.pool.maxActive}"</span><span> </span><span class="tag">/></span><span>  </span></span></li><li class=""><span>    <span class="tag"><</span><span class="tag-name">property</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"maxIdle"</span><span> </span><span class="attribute">value</span><span>=</span><span class="attribute-value">"{redis.pool.maxIdle}” />
<property name=“maxWait” value=“{redis.pool.maxWait}"</span><span> </span><span class="tag">/></span><span>  </span></span></li><li class=""><span>    <span class="tag"><</span><span class="tag-name">property</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"testOnBorrow"</span><span> </span><span class="attribute">value</span><span>=</span><span class="attribute-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}"</span><span> </span><span class="tag">/></span><span>  </span></span></li><li class="alt"><span>    <span class="tag"><</span><span class="tag-name">property</span><span> </span><span class="attribute">name</span><span>=</span><span class="attribute-value">"port"</span><span> </span><span class="attribute">value</span><span>=</span><span class="attribute-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” />

<!-- 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。

[java] view plain copy print?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;
}
}

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。

[java] view plain copy print?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()); } }

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：

[html] view plain copy print?<bean id=“userService” class=“Service.UserService”>
<property name=“redisTemplate”>
<ref bean=“redisTemplate” />
</property>
</bean>

<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。

[java] view plain copy print?@Service(“userService”)
public class UserService {

@Autowired
RedisTemplate<String, User> redisTemplate;
……
……
}

@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：[html] view plain copy print?<context:component-scan base-package=“*” />

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

在main中来简单操作一下：

[java] view plain copy print?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));

}
}

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));

}
}

确保redis服务器是开启状态之后就可以运行程序。运行结果如下：



非Maven项目需要导入spring-data-redis-1.6.2.RELEASE.jar

jedis-2.7.2.jar（依赖 commons-pool2-2.3.jar）

commons-pool2-2.3.jar

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"> 
<!--[redis-JedisPoolConfig配置](http://blog.csdn.net/liang_love_java/article/details/50510753)-->
<!--    jedis-2.7.2.jar 依赖jar包 commons-pool2-2.3.jar
jedis基于 commons-pool2-2.3.jar 自己实现了一个资源池。
配置参数 详见 http://blog.csdn.net/liang_love_java/article/details/50510753 -->
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="1" />
<property name="maxTotal" value="5" />
<property name="blockWhenExhausted" value="true" />
<property name="maxWaitMillis" value="30000" />
<property name="testOnBorrow" value="true" />
</bean>

<bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
<property name="hostName" value="10.1.8.200" />
<property name="port" value="6379"/>
<property name="poolConfig" ref="jedisPoolConfig" />
<property name="usePool" value="true"/>
</bean>

<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">
<property name="connectionFactory"   ref="jedisConnectionFactory" />
<property name="keySerializer">
<bean class="org.springframework.data.redis.serializer.StringRedisSerializer" />
</property>
<property name="valueSerializer">
<bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer" />
</property>
<property name="hashKeySerializer">
<bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>
</property>
<property name="hashValueSerializer">
<bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/>
</property>
</bean>

</beans>