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