redis集成到Springmvc中及使用实例

redis是现在主流的缓存工具了，因为使用简单、高效且对服务器要求较小，用于大数据量下的缓存

spring也提供了对redis的支持： org.springframework.data.redis.core.RedisTemplate

为了在springmvc环境中使用redis，官方推荐是和jedis结合使用，由jedis来管理连接这些

首先进行整合配置

1.properties文件

#############Common Redis configuration
cache.redis.maxIdle=5
cache.redis.maxActive=20
cache.redis.maxWait=1000
cache.redis.testOnBorrow=true

##############Redis configuration
cache.redis.host=127.0.0.1
cache.redis.port=6379
cache.redis.password=
cache.redis.db=0
cache.redis.timeout=2000

##############
cache.cacheExpire=500

2.xml配置文档

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">

    <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
        <property name="maxTotal" value="${cache.redis.maxActive}" />
        <property name="maxIdle" value="${cache.redis.maxIdle}" />
        <property name="maxWaitMillis" value="${cache.redis.maxWait}" />
        <property name="testOnBorrow" value="${cache.redis.testOnBorrow}" />
    </bean>

    <bean id="redisConnectionFactory"
        class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory">
        <property name="usePool" value="true"></property>
        <property name="hostName" value="${cache.redis.host}" />
        <property name="port" value="${cache.redis.port}" />
        <property name="password" value="${cache.redis.password}" />
        <property name="timeout" value="${cache.redis.timeout}" />
        <property name="database" value="${cache.redis.db}"></property>
        <constructor-arg index="0" ref="jedisPoolConfig" />
    </bean>

    <bean id="redisCache" class="org.springframework.data.redis.core.RedisTemplate">
        <property name="connectionFactory" ref="redisConnectionFactory" />
        <property name="keySerializer" ref="stringRedisSerializer" />
        <property name="valueSerializer" ref="stringRedisSerializer" />
        <property name="hashKeySerializer" ref="stringRedisSerializer" />
        <property name="hashValueSerializer" ref="stringRedisSerializer" />
    </bean>

    <bean id="stringRedisSerializer"
        class="org.springframework.data.redis.serializer.StringRedisSerializer" />
</beans>

3.使用实例之，存入到redis

package net.zicp.xiaochangwei.web.cache;

import java.util.List;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import net.zicp.xiaochangwei.web.dao.CityDao;
import net.zicp.xiaochangwei.web.dao.FeedBackDao;
import net.zicp.xiaochangwei.web.dao.HobbyDao;
import net.zicp.xiaochangwei.web.dao.PhotoDao;
import net.zicp.xiaochangwei.web.dao.RolePermissionDao;
import net.zicp.xiaochangwei.web.dao.UserDao;
import net.zicp.xiaochangwei.web.entity.City;
import net.zicp.xiaochangwei.web.entity.Hobby;
import net.zicp.xiaochangwei.web.entity.HobbyType;
import net.zicp.xiaochangwei.web.entity.Permission;
import net.zicp.xiaochangwei.web.entity.Photos;
import net.zicp.xiaochangwei.web.entity.Role;
import net.zicp.xiaochangwei.web.entity.UserInfo;
import net.zicp.xiaochangwei.web.utils.Constant;
import net.zicp.xiaochangwei.web.utils.NamedThreadFactory;

import org.apache.commons.collections.CollectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import com.alibaba.fastjson.JSON;

/**
 *
 * @author xiaochangwei
 * redis缓存变动较少的数据并定时刷新
 */
@Component
public class BasicDataCacheLoader implements InitializingBean, DisposableBean {

    private final Logger log = LoggerFactory.getLogger(this.getClass());

    protected static final int CORE_SIZE = Runtime.getRuntime().availableProcessors() * 2;

    @Value("${cache.cacheExpire}")
    private long cacheExpire;

    private ScheduledThreadPoolExecutor executor = null;

    @Autowired
    private RedisTemplate<String, String> redisCache;

    @Autowired
    private FeedBackDao feedBackDao;

    @Autowired
    private RolePermissionDao rolePermissionDao;

    @Autowired
    private CityDao cityDao;

    @Autowired
    private HobbyDao hobbyDao;

    @Autowired
    private UserDao userDao;

    @Autowired
    private PhotoDao photoDao;

    @Override
    public void destroy() throws Exception {
        executor.shutdownNow();
    }

    @Override
    public void afterPropertiesSet() throws Exception {

        executor = new ScheduledThreadPoolExecutor(CORE_SIZE, new NamedThreadFactory("static-info-loader"));
        RefreshCache refreshCache = new RefreshCache();
        refreshCache.run();
        executor.scheduleWithFixedDelay(refreshCache, cacheExpire, cacheExpire, TimeUnit.SECONDS);

    }

    private class RefreshCache implements Runnable {
        @Override
        public void run() {
            log.info("---开始刷新角色权限缓存-----");
            List<Role> roles = rolePermissionDao.getAllRole();
            if (CollectionUtils.isNotEmpty(roles)) {
                for (Role role : roles) {
                    List<Permission> permissions = rolePermissionDao.getPermissionByRole(role.getRid());
                    role.setPermissions(permissions);
                    redisCache.opsForValue().set(Constant.ROLE + role.getRid(), JSON.toJSONString(role));
                }
            }

            log.info("---开始刷新城市缓存-----");
            List<City> cityProvince = cityDao.getAllProvince();
            redisCache.opsForValue().set(Constant.CITY_ROOT, JSON.toJSONString(cityProvince));
            if (CollectionUtils.isNotEmpty(cityProvince)) {
                for (City sheng : cityProvince) {
                    List<City> shis = cityDao.getCityByParentId(sheng.getCid());
                    sheng.setChildren(shis);
                    redisCache.opsForValue().set(Constant.CITY + sheng.getCid(), JSON.toJSONString(sheng));
                    if (CollectionUtils.isNotEmpty(shis)) {
                        for (City shi : shis) {
                            List<City> xians = cityDao.getCityByParentId(shi.getCid());
                            shi.setChildren(xians);
                            redisCache.opsForValue().set(Constant.CITY + shi.getCid(), JSON.toJSONString(shi));
                            for (City xian : xians) {
                                redisCache.opsForValue().set(Constant.CITY + xian.getCid(), JSON.toJSONString(xian));
                            }
                        }
                    }
                }
            }

            log.info("---开始刷新兴趣爱好缓存-----");
            List<HobbyType> allHobby = hobbyDao.getAllHobbys();
            if(CollectionUtils.isNotEmpty(allHobby)){
                for(HobbyType ht : allHobby){
                    List<Hobby> hobbys = hobbyDao.getHobbyItems(ht.getHtId());
                    if(CollectionUtils.isNotEmpty(hobbys)){
                        ht.setHobbys(hobbys);
                    }
                    redisCache.opsForValue().set(Constant.HOBBY + ht.getHtId(), JSON.toJSONString(ht));
                }
            }

            log.info("---开始刷新用户信息缓存-----");
            List<UserInfo> userinfos = userDao.getAllUserInfo();
            if(CollectionUtils.isNotEmpty(userinfos)){
                for(UserInfo userInfo : userinfos){
                    List<Photos> photos = photoDao.getUserPhotos(userInfo.getUserId());
                    if(CollectionUtils.isNotEmpty(photos)){
                        userInfo.setPhotos(photos);
                    }
                    redisCache.opsForValue().set(Constant.USER_INFO + userInfo.getUserId(), JSON.toJSONString(userInfo));
                }
            }

        }
    }
}

4.从redis中获取并解析为对象

@Override
    public List<UserInfo> getUserInfoFromCache(int number) {
        Set<String> sets = redis.keys(Constant.USER_INFO + "*");
        Iterator<String> it = sets.iterator();
        List<UserInfo> result = new LinkedList<UserInfo>();
        int i = 0;
        while(it.hasNext() && i<number){
            String item = it.next();
            String value = redis.opsForValue().get(item);
            result.add(JSON.parseObject(value,UserInfo.class));
            i++;
        }
        return result;
    }