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());  }  
}

使用注解方式自动注入，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));  }  
}

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：

转载自：点击打开链接