Maven中Spring-Data-Redis存储对象(redisTemplate) （转）
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：
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<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
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#redis configredis.pool.maxActive=100redis.pool.maxIdle=20redis.pool.maxWait=1000redis.pool.testOnBorrow=trueredis.hostname=localhostredis.port=6379redis.password= |
在上下文配置中使用key-value读取方式读取properties中的值：
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<!-- 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。
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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。
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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：
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<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。
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@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：
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<context:component-scan base-package="*" /> |
在main中来简单操作一下：
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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)); }} |
http://www.cnblogs.com/jifeng/p/4422435.html
