詳解java之redis篇(spring-data-redis整合)
1,利用spring-data-redis整合
項(xiàng)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> <!-- 將現(xiàn)有的jakarta commons logging的調(diào)用轉(zhuǎn)換成lsf4j的調(diào)用。 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>1.6.1</version> </dependency> <!-- Hack:確保commons-logging的jar包不被引入,否則將和jcl-over-slf4j沖突 --> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> <scope>provided</scope> </dependency> <!-- slf4j的實(shí)現(xiàn):logback,用來取代log4j。更快、更強(qiáng)! --> <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,只有一個(gè)spring core 和 spring-data-redis了
項(xiàng)目文件目錄結(jié)構(gòu):
applicationContext.xml:
1,context:property-placeholder 標(biāo)簽用來導(dǎo)入properties文件。從而替換${redis.maxIdle}這樣的變量。
2,context:component-scan 是為了在com.x.redis.dao報(bào)下的類能夠?qū)嵱胹pring的注解注入的方式。
3,事實(shí)上我們只需要把JedisPoolConfig配數(shù)來就好了,接下來就是spring的封裝了。所以直接看UserDAOImpl的實(shí)現(xiàn)就明白了。
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:property-placeholder location="classpath:redis.properties" /> <context:component-scan base-package="com.x.redis.dao"> </context:component-scan> <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig"> <property name="maxIdle" value="${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對(duì)dao層的封裝很多用了類似于下面代碼的模板方式。
2,RedisTemplate就是spring對(duì)redis的一個(gè)封裝而已。
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; } }
測(cè)試代碼:
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
個(gè)人覺得這樣整合靈活度更大,能夠更加明了的完成任務(wù)。
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> <!-- 將現(xiàn)有的jakarta commons logging的調(diào)用轉(zhuǎn)換成lsf4j的調(diào)用。 --> <dependency> <groupId>org.slf4j</groupId> <artifactId>jcl-over-slf4j</artifactId> <version>1.6.1</version> </dependency> <!-- Hack:確保commons-logging的jar包不被引入,否則將和jcl-over-slf4j沖突 --> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.1.1</version> <scope>provided</scope> </dependency> <!-- slf4j的實(shí)現(xiàn):logback,用來取代log4j。更快、更強(qiáng)! --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>0.9.24</version> <scope>runtime</scope> </dependency> </dependencies> </project>
目錄結(jié)構(gòu):
data-source.xml
1,context:property-placeholder 和 context:component-scan 前面解釋過啦。
2,配置了一個(gè)ShardedJedisPool,在jdeis里 還有個(gè)JedisPool。這兩個(gè)的區(qū)別:
一個(gè)是分片形式,可以連接有主備的redis服務(wù)端,一個(gè)是單個(gè)的。詳細(xì)后續(xù)學(xué)習(xí)
3,因?yàn)椴皇褂胹pring-data-redis的封裝,所以自己要自己封裝一個(gè)
<?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:定義三個(gè)方法
public interface RedisDataSource { public abstract ShardedJedis getRedisClient(); public void returnResource(ShardedJedis shardedJedis); public void returnResource(ShardedJedis shardedJedis,boolean broken); }
實(shí)現(xiàn)redisDataSource:
1, 注入配置好的ShardedJedisPool,這三個(gè)方法的作用:
- getRedisClient() : 取得redis的客戶端,可以執(zhí)行命令了。
- returnResource(ShardedJedis shardedJedis) : 將資源返還給pool
- returnResource(ShardedJedis shardedJedis, boolean broken) : 出現(xiàn)異常后,將資源返還給pool (其實(shí)不需要第二個(gè)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); } } }
第二層的封裝:RedisClientTemplate,例子實(shí)現(xiàn)了放值和取值。最后代碼提供了全部命令的實(shí)現(xiàn)。
代碼就是映射性質(zhì)的又一次調(diào)用jedis的方法而已,用了個(gè)broken來做標(biāo)示符,決定返還資源的方式。
這一層的目的主要也是讓再上層的調(diào)用不需要關(guān)心pool中鏈接的取得和返還問題了。
@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(); } /** * 設(shè)置單個(gè)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; } /** * 獲取單個(gè)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; } }
測(cè)試代碼:
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全部實(shí)現(xiàn):
RedisClientTemplate代碼太多,附上下載地址:http://xiazai.jb51.net/201701/yuanma/RedisClientTemplate_jb51.rar
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
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