SSM框架集成Redis数据库【Redis·4】

最近项目中引进redis用来存放图片或者一些不常修改的数据，以减轻程序及数据库压力。记录下配置过程。

框架：SpringMVC+Mybatis

版本：

            Spring4.0      

            Mybatis3.0     

            jedis-2.9.0    

            spring-data-commons-1.8.6.RELEASE.jar        

            spring-data-redis-1.8.6.RELEASE.jar

备注：如果是Spring3.0 的版本，请使用低版本的   jedis-2.4.2.jar    spring-data-commons-core-1.4.0.RELEASE.jar    spring-data-redis-1.4.2.RELEASE.jar  

redis配置

1、将下载好的jar包放入项目中。

jedis-2.9.0 下载    spring-data-commons-1.8.6.RELEASE.jar 下载   spring-data-redis-1.8.6.RELEASE.jar下载

2、创建一个spring-context-redis.xml，将redis相关信息集成进Spring中

<beans xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"    xmlns:aop="http://www.springframework.org/schema/aop"    xsi:schemaLocation="http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd      http://www.springframework.org/schema/context      http://www.springframework.org/schema/context/spring-context-3.0.xsd      http://www.springframework.org/schema/mvc      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd        http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd        http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd        http://www.springframework.org/schema/util       http://www.springframework.org/schema/util/spring-util-3.0.xsd">    <!-- 加载配置属性文件 -->    <context:property-placeholder ignore-unresolvable="true" location="classpath:config.properties" />        <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">         <property name="maxIdle" value="1" />         <property name="maxTotal" value="5" />         <property name="blockWhenExhausted" value="true" />         <property name="maxWaitMillis" value="30000" />         <property name="testOnBorrow" value="true" />      </bean>     <bean id="jedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">         <property name="hostName" value="${jedis.JedisServerIp}" />         <property name="port" value="${jedis.JedisServerPort}"/><!--    <property name="timeout" value="${jedis.timeout}"/>-->        <property name="password" value="${jedis.auth}"></property>        <property name="poolConfig" ref="jedisPoolConfig" />         <property name="usePool" value="true"/>     </bean>     <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">           <property name="connectionFactory"   ref="jedisConnectionFactory" />           <property name="keySerializer">               <bean class="org.springframework.data.redis.serializer.StringRedisSerializer" />           </property>              <property name="valueSerializer">               <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer" />           </property>           <property name="hashKeySerializer">                <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/>             </property>           <property name="hashValueSerializer">              <bean class="com.bonc.wechat.services.redis.CustomRedisSerializer"/>             </property>      </bean>   </beans>

注：hashValueSerializer 是 自己配置的用来序列化的类，可以注掉，也可以改用jedis本身的序列化方法。

在config.properties中配置好连接地址，端口，密码等信息。

3、在web.xml中注册刚才配置的文件，保证项目启动后能够加载

至此redis已经集成进了项目之中，可能出现的错误就是版本不匹配，即Spring的版本与jedis的版本不匹配产生的，更换相应的版本即可。

redis的使用

1、完成redis配置后，需要创建一个redis的工具类 或者 是 service方法，用来方便的调用redis中的相关增删改查的方法

package com.bonc.wechat.services.redis;import java.util.HashMap;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.redis.core.HashOperations;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.ValueOperations;import org.springframework.stereotype.Service;import com.bonc.wechat.common.util.JSONUtil;import com.bonc.wechat.common.util.RedisDecodeUtil;@Servicepublic class RedisService {@AutowiredRedisTemplate<String, Object> redisTemplate;/** * 清楚缓存对象 * @param rkey * @throws Exception */public void del(String rkey) throws Exception {redisTemplate.delete(rkey);}/** * 向redis缓存放入任意对象 * @param rkey Map键 * @param map  * @throws Exception */public void oset(String rkey, Object object) throws Exception {ValueOperations<String, Object> value = redisTemplate.opsForValue();if(object instanceof String){value.set(rkey, object.toString());}else{value.set(rkey, JSONUtil.serialize(object,true));}}/** * 向redis缓存放入Map * @param rkey Map键 * @param map  * @throws Exception */public void oset(String rkey, Map<String,Object> map) throws Exception {oset(rkey,map,false);}/** * 向redis缓存放入Map * @param rkey Map键 * @param map  * @param override 是否覆盖 * @throws Exception */public void oset(String rkey, Map<String,Object> map, boolean override) throws Exception {del(rkey);//if(override) {//}HashOperations<String, String, Object>  objList = redisTemplate.opsForHash();Set<Entry<String, Object>> keys = map.entrySet();Map<String,String> temp = new HashMap<String, String>();for (Entry<String, Object> entry : keys) {temp.put(entry.getKey(), JSONUtil.serialize(entry.getValue(),true));}objList.putAll(rkey,temp);}/** * 自增 * @param rkey 存放在redis的key * @return * @throws Exception */public Long incr(String rkey) throws Exception {return incrBy(rkey, 1L);}/** * 自增 * @param rkey 存放在redis的key * @return * @throws Exception */public Long incrBy(String rkey,long l) throws Exception {ValueOperations<String, Object> value = redisTemplate.opsForValue();return value.increment(rkey, l);}/** * 取出String * @param rkey 存放在redis的key * @return * @throws Exception */public String get(String rkey) throws Exception {ValueOperations<String, Object> value = redisTemplate.opsForValue();Object val = value.get(rkey);return val==null?null:val.toString();}/** * 取出对象 * @param rkey 存放在redis的key * @return * @throws Exception */public Object oget(String rkey) throws Exception {switch(redisTemplate.type(rkey).code()){case "string":ValueOperations<String, Object> value = redisTemplate.opsForValue();return RedisDecodeUtil.parse(value.get(rkey).toString());case "hash":HashOperations<String, String, Object>  objList = redisTemplate.opsForHash();return objList.entries(rkey);default:return null;}}/** * 按类型获取 * @param rkey 存放在redis的key * @param cls value的类类型 * @return * @throws Exception */@SuppressWarnings("unchecked")public <T> T oget(String rkey, Class<?> cls) throws Exception {return (T) oget(rkey);}/** * 按类型获取Map值 * @param rkey 存放在redis的key * @param key map的key * @param cls value的类类型 * @return * @throws Exception */@SuppressWarnings("unchecked")public <T> T oget(String rkey, String key, Class<?> cls) throws Exception {return (T) hget(rkey,key);}/** * 获取map值 * @param rkey 存放在redis的key * @param key map的key * @return * @throws Exception */public Object hget(String rkey,String key) throws Exception {if(redisTemplate.hasKey(rkey)){HashOperations<String, String, Object>  objList = redisTemplate.opsForHash();return objList.get(rkey, key);}return null;}}

备注：JSONUtil 与 RedisDecodeUtil  下载地址

2、controller中调用。

@Resourceprivate RedisService redisService;

/** * 从redis中获取数据 * 返回值为对象 */@RequestMapping(value="/getRedisData")@ResponseBodypublic AppReply<T> getRedisData(@RequestParam("key")String key){AppReply<T> appReply = new AppReply<>();try {Object obj = redisService.oget(key);if(obj != null){appReply.setCode("1");appReply.setObj(obj);}else{appReply.setCode("0");appReply.setObj(null);}} catch (Exception e) {e.printStackTrace();}return appReply;}

3、返回数据查看

返回结果：

数据库数据：

至此，SSM整合redis就全部完成。