详解java之redis篇(spring-data-redis整合)

1，利用spring-data-redis整合

项目使用的pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.x.redis</groupId>
<artifactId>Spring_redis</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Spring_redis</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>1.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.1</version>
</dependency>
<!-- 将现有的jakarta commons logging的调用转换成lsf4j的调用。 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.6.1</version>
</dependency>
<!-- Hack：确保commons-logging的jar包不被引入，否则将和jcl-over-slf4j冲突 -->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
<scope>provided</scope>
</dependency>
<!-- slf4j的实现：logback，用来取代log4j。更快、更强！ -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>0.9.24</version>
<scope>runtime</scope>
</dependency>
</dependencies>
</project>

除了log部分，只有一个spring core 和 spring-data-redis了

项目文件目录结构：

applicationContext.xml：

1，context:property-placeholder 标签用来导入properties文件。从而替换${redis.maxIdle}这样的变量。

2，context:component-scan 是为了在com.x.redis.dao报下的类能够实用spring的注解注入的方式。

3，事实上我们只需要把JedisPoolConfig配数来就好了，接下来就是spring的封装了。所以直接看UserDAOImpl的实现就明白了。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:redis.properties" />
<context:component-scan base-package="com.x.redis.dao">
</context:component-scan>
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="${redis.maxIdle}" />
<property name="maxActive" value="${redis.maxActive}" />
<property name="maxWait" value="${redis.maxWait}" />
<property name="testOnBorrow" value="${redis.testOnBorrow}" />
</bean>
<bean id="connectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}" p:pool-config-ref="poolConfig"/>
<bean id="redisTemplate" class="org.springframework.data.redis.core.StringRedisTemplate">
<property name="connectionFactory" ref="connectionFactory" />
</bean>
<bean id="userDAO" class="com.x.redis.dao.impl.UserDAOImpl" />
</beans>

redis.properties：

# Redis settings
#redis.host=192.168.20.101
#redis.port=6380
#redis.pass=foobared
redis.host=127.0.0.1
redis.port=6379
redis.pass=
redis.maxIdle=300
redis.maxActive=600
redis.maxWait=1000
redis.testOnBorrow=true

UserDAOImpl：

1，spring对dao层的封装很多用了类似于下面代码的模板方式。

2，RedisTemplate就是spring对redis的一个封装而已。

public class UserDAOImpl implements UserDAO {
@Autowired
protected RedisTemplate<Serializable, Serializable> redisTemplate;
public void saveUser(final User user) {
redisTemplate.execute(new RedisCallback<Object>() {
@Override
public Object doInRedis(RedisConnection connection) throws DataAccessException {
connection.set(redisTemplate.getStringSerializer().serialize("user.uid." + user.getId()),
redisTemplate.getStringSerializer().serialize(user.getName()));
return null;
}
});
}
@Override
public User getUser(final long id) {
return redisTemplate.execute(new RedisCallback<User>() {
@Override
public User doInRedis(RedisConnection connection) throws DataAccessException {
byte[] key = redisTemplate.getStringSerializer().serialize("user.uid." + id);
if (connection.exists(key)) {
byte[] value = connection.get(key);
String name = redisTemplate.getStringSerializer().deserialize(value);
User user = new User();
user.setName(name);
user.setId(id);
return user;
}
return null;
}
});
}
}

其他：

User：

public class User {
private long id;
private String name;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

测试代码：

public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:/applicationContext.xml");
UserDAO userDAO = (UserDAO)ac.getBean("userDAO");
User user1 = new User();
user1.setId(1);
user1.setName("obama");
userDAO.saveUser(user1);
User user2 = userDAO.getUser(1);
System.out.println(user2.getName());
}

2，不利用spring-data-redis整合

个人觉得这样整合灵活度更大，能够更加明了的完成任务。

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.d.work</groupId>
<artifactId>Redis_Templete</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Redis_Templete</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>3.1.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.1</version>
</dependency>
<!-- 将现有的jakarta commons logging的调用转换成lsf4j的调用。 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.6.1</version>
</dependency>
<!-- Hack：确保commons-logging的jar包不被引入，否则将和jcl-over-slf4j冲突 -->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
<scope>provided</scope>
</dependency>
<!-- slf4j的实现：logback，用来取代log4j。更快、更强！ -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>0.9.24</version>
<scope>runtime</scope>
</dependency>
</dependencies>
</project>

目录结构：

data-source.xml

1，context:property-placeholder 和 context:component-scan 前面解释过啦。

2，配置了一个ShardedJedisPool，在jdeis里 还有个JedisPool。这两个的区别:

一个是分片形式，可以连接有主备的redis服务端，一个是单个的。详细后续学习

3，因为不使用spring-data-redis的封装，所以自己要自己封装一个

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:redis.properties" />
<context:component-scan base-package="com.d.work.main">
</context:component-scan>
<context:component-scan base-package="com.d.work.redis">
</context:component-scan>
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxActive" value="50" />
<property name="maxIdle" value="8" />
<property name="maxWait" value="1000" />
<property name="testOnBorrow" value="true"/>
<property name="testOnReturn" value="true"/>
<!-- <property name="testWhileIdle" value="true"/> -->
</bean>
<bean id="shardedJedisPool" class="redis.clients.jedis.ShardedJedisPool" scope="singleton">
<constructor-arg index="0" ref="jedisPoolConfig" />
<constructor-arg index="1">
<list>
<bean class="redis.clients.jedis.JedisShardInfo">
<constructor-arg name="host" value="${redis.host}" />
<constructor-arg name="port" value="${redis.port}" />
<constructor-arg name="timeout" value="${redis.timeout}" />
<constructor-arg name="weight" value="1" />
</bean>
</list>
</constructor-arg>
</bean>
</beans>

RedisDataSource:定义三个方法

public interface RedisDataSource {
public abstract ShardedJedis getRedisClient();
public void returnResource(ShardedJedis shardedJedis);
public void returnResource(ShardedJedis shardedJedis,boolean broken);
}

实现redisDataSource:

1, 注入配置好的ShardedJedisPool，这三个方法的作用：

•  getRedisClient() ： 取得redis的客户端，可以执行命令了。
• returnResource(ShardedJedis shardedJedis) ： 将资源返还给pool
• returnResource(ShardedJedis shardedJedis, boolean broken) : 出现异常后，将资源返还给pool （其实不需要第二个方法）

@Repository("redisDataSource")
public class RedisDataSourceImpl implements RedisDataSource {
private static final Logger log = LoggerFactory.getLogger(RedisDataSourceImpl.class);
@Autowired
private ShardedJedisPool shardedJedisPool;
public ShardedJedis getRedisClient() {
try {
ShardedJedis shardJedis = shardedJedisPool.getResource();
return shardJedis;
} catch (Exception e) {
log.error("getRedisClent error", e);
}
return null;
}
public void returnResource(ShardedJedis shardedJedis) {
shardedJedisPool.returnResource(shardedJedis);
}
public void returnResource(ShardedJedis shardedJedis, boolean broken) {
if (broken) {
shardedJedisPool.returnBrokenResource(shardedJedis);
} else {
shardedJedisPool.returnResource(shardedJedis);
}
}
}

第二层的封装：RedisClientTemplate，例子实现了放值和取值。最后代码提供了全部命令的实现。

代码就是映射性质的又一次调用jedis的方法而已，用了个broken来做标示符，决定返还资源的方式。

这一层的目的主要也是让再上层的调用不需要关心pool中链接的取得和返还问题了。

@Repository("redisClientTemplate")
public class RedisClientTemplate {
private static final Logger log = LoggerFactory.getLogger(RedisClientTemplate.class);
@Autowired
private RedisDataSource  redisDataSource;
public void disconnect() {
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
shardedJedis.disconnect();
}
/**
* 设置单个值
*
* @param key
* @param value
* @return
*/
public String set(String key, String value) {
String result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.set(key, value);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
/**
* 获取单个值
*
* @param key
* @return
*/
public String get(String key) {
String result = null;
ShardedJedis shardedJedis = redisDataSource.getRedisClient();
if (shardedJedis == null) {
return result;
}
boolean broken = false;
try {
result = shardedJedis.get(key);
} catch (Exception e) {
log.error(e.getMessage(), e);
broken = true;
} finally {
redisDataSource.returnResource(shardedJedis, broken);
}
return result;
}
}

测试代码：

public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:/data-source.xml");
RedisClientTemplate redisClient = (RedisClientTemplate)ac.getBean("redisClientTemplate");
redisClient.set("a", "abc");
System.out.println(redisClient.get("a"));
}

附上RedisClientTemplate全部实现：

RedisClientTemplate代码太多，附上下载地址：http://xiazai.jb51.net/201701/yuanma/RedisClientTemplate_jb51.rar

 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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