Redis集群版在Java中的应用

1、配置redis集群

    <?xml version="1.0" encoding="UTF-8"?>
    <redisCluster>
        <!--userRoute -->
        <clusterGroup name="userRoute" selectdb="1">
            <server host="10.177.129.16" port="6379"></server>
            <server host="10.177.129.15" port="6379"></server>
        </clusterGroup>
        <!--sessionRoute -->
        <clusterGroup name="sessionRoute" selectdb="2">
            <server host="10.177.129.16" port="6379"></server>
            <server host="10.177.129.15" port="6379"></server>
        </clusterGroup>
        <!--publicData -->
        <clusterGroup name="publicData">
            <server host="10.177.129.16" port="6379"></server>
            <server host="10.177.129.15" port="6379"></server>
        </clusterGroup>
    </redisCluster>  

2、创建redis连接属性实体类

    package net.itxm.cms.syscore.pojo;
    /**
     * redis连接属性
     *
     */
    public class RedisCluster
    {
        private String selectdb;
        private String hostIp;
        private String  port;
        public String getSelectdb() {
            return selectdb;
        }
        public void setSelectdb(String selectdb) {
            this.selectdb = selectdb;
        }
        public String getHostIp() {
            return hostIp;
        }
        public void setHostIp(String hostIp) {
            this.hostIp = hostIp;
        }
        public String getPort() {
            return port;
        }
        public void setPort(String port) {
            this.port = port;
        }
    }  

3、解析redis集群配置

    package net.itxm.itreasury.test.jedis;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.List;
    import java.util.Map;
    import java.util.Set;
    import org.dom4j.Document;
    import org.dom4j.DocumentException;
    import org.dom4j.Element;
    import org.dom4j.io.SAXReader;
    import org.springframework.core.io.ClassPathResource;
    import org.springframework.core.io.Resource;
    import org.springframework.core.io.support.EncodedResource;
    /**
     * 解析redis集群配置
     *
     */
    public class RedisConfig {
    public static Map<String,List<RedisCluster>> redisGroupMap = null;
    //有参构造函数
    public RedisConfig()
    {
    }
    //获取所有clusterGroup组的键值对
    public static Map<String,List<RedisCluster>> getRedisGroupMap(){
        //读取xml文件
        Document document=readXmlFile();
        //获得clusterGroup节点的key 和 list
        if(redisGroupMap == null)
        {
            redisGroupMap=getMapByItemsGroup(document);
        }
        return redisGroupMap;
    }
    //读取redisConfig配置文件
    private static Document readXmlFile(){
        //创建读入对象
        SAXReader reader = new SAXReader();
        //创建document实例
        Document doc=null;
        try {
        //从类路径下加载文件redisConfig.xml
        Resource resource = new ClassPathResource("redisClusterConfig.xml");
        //指定文件资源对应的编码格式（UTF-8),这样才能正确读取文件的内容，而不会出现乱码
        EncodedResource encodeResource = new EncodedResource(resource,"UTF-8");
        doc = reader.read(encodeResource.getReader());
        }
        catch (IOException e) {
            System.out.println("无法读取系统配置文件redisConfig.xml,可能该文件不存在");
        } catch (DocumentException e) {
            System.out.println("解析redisConfig.xml文件出现异常");
        }
        return doc;
    }
    //读取xml节点,返回节点为redisGroup的Map
    private  static Map<String,List<RedisCluster>> getMapByItemsGroup(Document document){
        Map<String,List<RedisCluster>> itemmap=new HashMap<String,List<RedisCluster>>();
        try{
            //获得根节点
            Element root=document.getRootElement();
            //获得根节点下所有子节点clusterGroup的list
            List itemsList=root.selectNodes("./clusterGroup");
            for(int i=0;i<itemsList.size();i++){
            //获得节点Items
            Element items=(Element)itemsList.get(i);
            String groupName=items.attribute("name").getText();
            String selectdb = items.attribute("selectdb")==null?"":items.attribute("selectdb").getText();
    //      if(groupName!=null&&groupName.equals(this.getGroupName())){
                 //获得clusterGroup下所有子节点service的list
                 List itemList=items.elements();
                 //获得service节点的值
                 List<RedisCluster> redisClusterList = getItemList(itemList,selectdb);
                 itemmap.put(groupName, redisClusterList);
    //      }
            }
        }
        catch(Exception e){
        }
        return itemmap;
    }
    //获得所有Item下节点的redis服务节点
    private static List<RedisCluster> getItemList(List itemList,String selectdb){
        List<RedisCluster> redisClusterList = new ArrayList<RedisCluster>();
        for(int i=0;i<itemList.size();i++){
            //获得节点server
            Element item=(Element)itemList.get(i);
            String hostIp =  item.attribute("host").getText();
            String port = item.attribute("port").getText();
            RedisCluster redisCluster =new RedisCluster();
            redisCluster.setHostIp(hostIp);
            redisCluster.setPort(port);
            redisCluster.setSelectdb(selectdb);
            redisClusterList.add(redisCluster);
       }
        return redisClusterList;
    }
    public static void main(String[] args) {
        getRedisGroupMap();
        //JedisUtil.insertPublicDataObject("user1", "张三", JedisUtil.ONLINE_USER);
        //JedisUtil.insertPublicDataObject("user2", "李四", JedisUtil.ONLINE_USER);
        //JedisUtil.insertPublicDataObject("user3", "王五", JedisUtil.ONLINE_USER);
          Set s = JedisUtil.getAllSet(JedisUtil.ONLINE_USER);
          Iterator it = s.iterator();
          while (it.hasNext()) {
           String key = (String) it.next();
           String value = JedisUtil.getString(key,JedisUtil.ONLINE_USER);
           System.out.println(key + value);
          }
        String test = JedisUtil.getString("user1",JedisUtil.ONLINE_USER);
        System.out.println(test);
    }
    }  

4、操作redis数据库的工具类

    package net.itxm.cms.syscore.utils;
    import java.lang.reflect.Type;
    import java.util.List;
    import java.util.Set;
    import java.util.zip.CRC32;
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.exceptions.JedisConnectionException;
    import com.google.gson.Gson;
    import com.isoftstone.cms.syscore.pojo.RedisCluster;
    public class JedisUtil {
        // 数据库
        public static final String STORE_LOGINUSER = "4";// 商户登陆用户
        public static final String STORE_INFO = "5";// 商户状态 商户购买服务有效期
        public static final String CHECK_CODE = "6";// 验证码
        public static final String MENU = "7";// 全部菜单
        public static final String SERVICE = "8";// 服务收费信息
        public static final String STORE_LOGINKEY = "9";// 初始化登录公钥 私钥对
        // 固定key
        public static final String ALL_MENU_KEY = "ALL_MENU_KEY";
        public static final String BUY_SERVICE_KEY = "BUY_SERVICE_KEY";// 服务收费购买key
        public static final String ALL_SERVICE_KEY = "ALL_SERVICE_KEY";//所有服务
        public static final String MENU_AUTHORITY = "MENU_AUTHORITY";// 菜单权限
        public static final String STORE_MENU_KEY = "STORE_MENU_KEY";// 需要商户分配的业务菜单
        public static final String STORE_SERVICE_KEY = "STORE_SERVICE_KEY";// 商户收费key
        public static final String SYSTE_MENU_KEY = "SYSTE_MENU_KEY";// 系统管理菜单key
        // jedis服务组业务类型
        public static final String CONT_CLUSTERNAME_PUBLICDATA = "publicData";
        public static final String CONT_CLUSTERNAME_SESSIONROUTE = "sessionRoute";
        public static final String CONT_CLUSTERNAME_USERROUTE = "userRoute";
        // 操作方式 0 插入 1获取 2 删除
        public static final long INSERT_OPERATION = 0;
        public static final long GET_OPERATION = 1;
        public static final long DELETE_OPERATION = 2;
        // 验证码过期秒数
        public static final int CHECKCODE_EXPIRESECONDS = 5*60;
        // session过期秒数
        public static final int EXPIRESECONDS = 30 * 60;
        private static void closeJedis(Jedis jedis) {
            try {
                jedis.quit();
            } catch (JedisConnectionException e) {
                e.printStackTrace();
            }
            jedis.disconnect();
        }
        /**
         * 根据Key获取字符串
         *
         * @param key
         * @param jedisGroup
         */
        public static String getString(String key, String selectdb) {
            Jedis jedis = getPublicDataJedis(key, GET_OPERATION, selectdb);
            return jedis.get(key);
        }
        /**
         * 获取所有数据set
         * @param selectdb
         * @return
         */
        public static Set getAllSet(String selectdb) {
            Jedis jedis = getDataJedis(GET_OPERATION, selectdb);
            return jedis.keys("*");
        }
        /**
         * 默认取配置文件的第一个数据库
         * @param operation
         * @param selectdb
         * @return
         */
        private static Jedis getDataJedis(long operation, String selectdb) {
            if (RedisConfig.redisGroupMap == null) {
                RedisConfig.redisGroupMap = RedisConfig.getRedisGroupMap();
            }
            List<RedisCluster> clustersList = RedisConfig.redisGroupMap.get(CONT_CLUSTERNAME_PUBLICDATA);
            int clusterNo = 0;//默认存到第一个
            RedisCluster cluster = clustersList.get(clusterNo);
            Jedis jedis = new Jedis(cluster.getHostIp(), Integer.valueOf(cluster.getPort()));
            jedis.select(Integer.valueOf(selectdb));
            return jedis;
        }
        /**
         * 删除数据
         *
         * @param key
         * @param jedisGroup
         */
        public static void deleteObject(String key, String jedisGroup) {
            Jedis jedis = getJedis(key, jedisGroup, DELETE_OPERATION);
            jedis.del(key);
            closeJedis(jedis);
        }
        /**
         * 删除公共数据
         *
         * @param key
         * @param objClass
         * @param selectdb
         */
        public static void deletePublicDataObject(String key, String selectdb) {
            Jedis jedis = getPublicDataJedis(key, DELETE_OPERATION, selectdb);
            jedis.del(key);
            closeJedis(jedis);
        }
        /**
         * 获取jedis的库实例
         *
         * @param key
         * @param jedisGroup
         * @param operation
         * @return
         */
        private static Jedis getJedis(String key, String jedisGroup, long operation) {
            if (RedisConfig.redisGroupMap == null) {
                RedisConfig.redisGroupMap = RedisConfig.getRedisGroupMap();
            }
            List<RedisCluster> clustersList = RedisConfig.redisGroupMap.get(jedisGroup);
            int arrayLength = clustersList.size();
            // 根据key值算出该信息应该存入到那个
            int clusterNo = getRedisNo(key, arrayLength);
            RedisCluster cluster = clustersList.get(clusterNo);
            Jedis jedis = new Jedis(cluster.getHostIp(), Integer.valueOf(cluster.getPort()));
            jedis.select(Integer.valueOf(cluster.getSelectdb()));
            return jedis;
        }
        /**
         * redis key值获取对象
         *
         * @param key
         * @param objClass
         * @param jedisGroup
         * @return
         */
        public static Object getObject(String key, Class objClass, String jedisGroup) {
            Jedis jedis = getJedis(key, jedisGroup, GET_OPERATION);
            String sObj = jedis.get(key);
            closeJedis(jedis);
            Gson gson = new Gson();
            return gson.fromJson(sObj, objClass);
        }
        /**
         * 获取公共数据jedis的库实例
         *
         * @param key
         * @param jedisGroup
         * @param operation
         * @return
         */
        private static Jedis getPublicDataJedis(String key, long operation, String selectdb) {
            if (RedisConfig.redisGroupMap == null) {
                RedisConfig.redisGroupMap = RedisConfig.getRedisGroupMap();
            }
            List<RedisCluster> clustersList = RedisConfig.redisGroupMap.get(CONT_CLUSTERNAME_PUBLICDATA);
            int arrayLength = clustersList.size();
            // 根据key值算出该信息应该存入到那个
            int clusterNo = getRedisNo(key, arrayLength);
            RedisClustercluster = clustersList.get(clusterNo);
            Jedis jedis = new Jedis(cluster.getHostIp(), Integer.valueOf(cluster.getPort()));
            jedis.select(Integer.valueOf(selectdb));
            return jedis;
        }
        /**
         * publicdata redis key值获取对象
         *
         * @param key
         * @param objClass
         * @param jedisGroup
         * @return
         */
        public static Object getPublicDataObject(String key, Class objClass, String selectdb) {
            Jedis jedis = getPublicDataJedis(key, GET_OPERATION, selectdb);
            String sObj = jedis.get(key);
            closeJedis(jedis);
            Gson gson = new Gson();
            return gson.fromJson(sObj, objClass);
        }
        /**
         * publicdata redis key值获取对象 List<Entity>
         *
         * @param key
         * @param objClass
         * @param jedisGroup
         * @return
         */
        public static Object getPublicDataObjectByType(String key, Type type, String selectdb) {
            Jedis jedis = getPublicDataJedis(key, GET_OPERATION, selectdb);
            String sObj = jedis.get(key);
            closeJedis(jedis);
            Gson gson = new Gson();
            return gson.fromJson(sObj, type);
        }
        /**
         * 获取redis服务器库编号
         *
         * @param hashKey
         * @return
         */
        public static int getRedisNo(String key, int arraySize) {
            long hashKey = hash(key);
            int redisNo = (int) (hashKey % arraySize);
            return redisNo;
        }
        /**
         * 根据key值算出hash值
         *
         * @param k
         * @return
         */
        public static long hash(String k) {
            CRC32 crc32 = new CRC32();
            crc32.update(k.getBytes());
            return crc32.getValue();
        }
        /**
         * redis 根据key值将对象插入到不同的库中
         *
         * @param key
         * @param insertObj
         * @param jedisGroup
         */
        public static void insertObject(String key, Object insertObj, String jedisGroup) {
            Jedis jedis = getJedis(key, jedisGroup, INSERT_OPERATION);
            Gson gson = new Gson();
            jedis.set(key, gson.toJson(insertObj));
            closeJedis(jedis);
        }
        /**
         * redis 根据key值将对象插入到不同的库中
         *
         * @param key
         * @param insertObj
         * @param jedisGroup
         * @param expire
         */
        public static void insertObject(String key, Object insertObj, String jedisGroup, int expireSeconds) {
            Jedis jedis = getJedis(key, jedisGroup, INSERT_OPERATION);
            Gson gson = new Gson();
            jedis.setex(key, expireSeconds, gson.toJson(insertObj));
            closeJedis(jedis);
        }
        /**
         * publicdata redis 根据key值将对象插入到不同的库中
         *
         * @param key
         * @param insertObj
         * @param jedisGroup
         */
        public static void insertPublicDataObject(Stringkey, Object insertObj, String selectdb) {
            Jedis jedis = getPublicDataJedis(key, INSERT_OPERATION, selectdb);
            Gson gson = new Gson();
            jedis.set(key, gson.toJson(insertObj));
            closeJedis(jedis);
        }
        /**
         * publicdata redis 根据key值将对象插入到不同的库中,
         *
         * @param key
         * @param insertObj
         * @param jedisGroup
         * @param expireSeconds
         */
        public static void insertPublicDataObject(String key, Object insertObj, String selectdb, int expireSeconds) {
            Jedis jedis = getPublicDataJedis(key, INSERT_OPERATION, selectdb);
            Gson gson = new Gson();
            jedis.setex(key, expireSeconds, gson.toJson(insertObj));
            closeJedis(jedis);
        }
        /**
         * 更新redis中key的超时时间
         *
         * @param key
         * @param jedisGroup
         * @param expireSeconds
         */
        public static void resetExpireSeconds(String key, String jedisGroup, int expireSeconds) {
            Jedis jedis = getJedis(key, jedisGroup, GET_OPERATION);
            jedis.expire(key, expireSeconds);
            closeJedis(jedis);
        }
    }  

5、所需jar包