http://blog.csdn.net/u010739551/article/details/48207691
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));
-
- }
- }
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:
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