Java中的Redis应用

时间：2023-03-08 16:26:02

1、配置redis集群

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<?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

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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

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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

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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); 
        <a href="http://www.itxm.net/" target="_blank">RedisCluster </a>cluster = 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(<a href="http://www.itxm.net/" target="_blank">String </a>key, 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
Java中的Redis应用

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