Redis GEO

关于redis GEO介绍命令可以参考官方文档：http://redis.io/commands/geoadd
主要命令：
GEOADD 添加地理位置信息
GEODIST 查询位置距离
GEOHASH 查询位置GEOHASH编码
GEOPOS 查询位置的坐标
GEORADIUS 查询某点的附近点
GEORADIUSBYMEMBER 查询某位置距离的附近点
如果要演示redis GEO功能我们需要下载Unstable版本进行编译安装，可以在官网下载：http://redis.io/download或到github去下载最新Unstable版本代码编译：https://github.com/antirez/redis。
关于安装请参考：http://blog.csdn.net/zhu_tianwei/article/details/44890579
下面我们来演示一下命令：
1.添加位置信息
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192.168.1.90:6379>
192.168.1.90:6379> GEOADD Guangdong-cities 113.2099647 23.593675 Qingyuan
(integer) 1
192.168.1.90:6379> GEOADD Guangdong-cities 113.2278442 23.1255978 Guangzhou 113.106308 23.0088312 Foshan 113.7943267 22.9761989 Dongguan 114.0538788 22.5551603 Shenzhen
(integer) 4
192.168.1.90:6379>
2.查询位置距离
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192.168.1.90:6379> GEODIST Guangdong-cities Qingyuan Guangzhou km

192.168.1.90:6379>
3.查询位置GEOHASH编码
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192.168.1.90:6379> GEOHASH Guangdong-cities Qingyuan Guangzhou
1) “ws0w0phgp70”
2) “ws0e89curg0”
192.168.1.90:6379>
4.查询位置的坐标
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192.168.1.90:6379> GEOPOS Guangdong-cities Qingyuan Guangzhou Foshan
1) 1) “113.20996731519699”
2) “23.593675019671288”
2) 1) “113.22784155607224”
2) “23.125598202060807”
3) 1) “113.10631066560745”
2) “23.008831202413539”
192.168.1.90:6379>
5.查询某点的附近点
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192.168.1.90:6379> GEORADIUS Guangdong-cities 113.2278442 23.1255978 50 km asc
1) “Guangzhou”
2) “Foshan”
192.168.1.90:6379>
6.查询某位置距离的附近点
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192.168.1.90:6379> GEORADIUSBYMEMBER Guangdong-cities Guangzhou 50 km asc
1) “Guangzhou”
2) “Foshan”
192.168.1.90:6379>
使用redis Java客户端jedis实例;
由于jedis并没有实现redis GEO的命令，测试使用lua脚本来实现：
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package test;

import java.util.List;

import redis.clients.jedis.Jedis;

public class Test {
private static Jedis jedis = null;
static{
jedis = new Jedis(“192.168.1.90”, 6379);
}

public static void main(String[] args) throws Exception {  
    System.out.println(geoADD("beijing", 116.312014, 39.963019,"haidian"));  
    System.out.println(geoADD("beijing", 116.227501, 39.90858,"shijingshan"));  
    System.out.println(geoADD("beijing", 116.297641, 39.861631,"fengtai"));  
    System.out.println(geoADD("beijing", 116.428146, 39.9316,"dongcheng"));  
    System.out.println(geoADD("beijing", 116.375829, 39.920091,"xicheng"));  
    System.out.println(geoADD("beijing", 116.110793, 39.943992,"mentougou"));  
    System.out.println(geoADD("beijing", 116.480464, 39.95948,"caoyang"));  
    System.out.println(geoADD("beijing", 116.663862, 39.916107,"tongzhou"));  
    System.out.println(geoADD("beijing", 116.349383, 39.729911,"daxing"));  
    System.out.println(geoADD("beijing", 116.157361, 39.748109,"fangshan"));  
    System.out.println(geoADD("beijing", 116.662137, 40.134017,"sunyi"));  
    System.out.println(geoADD("beijing", 116.2367, 40.224862,"changping"));  
    System.out.println(geoADD("beijing", 117.141617, 40.14196,"pinggu"));  
    System.out.println(geoADD("beijing", 116.64144, 40.316466,"huairou"));  


     System.out.println(geoHash("beijing","haidian"));  
     System.out.println(geoDist("beijing","haidian","shijingshan","km"));  
     System.out.println(geoPos("beijing","haidian"));  
     System.out.println(geoRadius("beijing",116.421822, 39.906809,10,"km",false));  
     System.out.println(geoRadiusByMember("beijing","dongcheng",10,"km",true));  
}  
/** 
 * 添加geo 
 * @param key  
 * @param longitude 
 * @param latitude 
 * @param name 位置名称 
 * @return 
 */  
public static Long geoADD(String key,double longitude,double latitude,String dName){  
    return (Long)jedis.eval("return redis.call('GEOADD',KEYS[1],KEYS[2],KEYS[3],KEYS[4])", 4,key,String.valueOf(longitude),String.valueOf(latitude),dName);  
}  

/** 
 * 查询2位置距离 
 * @param key 
 * @param d1 
 * @param d2 
 * @param unit 
 * @return 
 */  
public static Double geoDist(String key,String d1,String d2,String unit){  
    return Double.valueOf((String)jedis.eval("return redis.call('GEODIST',KEYS[1],KEYS[2],KEYS[3],KEYS[4])",4, key,d1,d2,unit));  
}  

/** 
 * 查询位置的geohash 
 * @param key 
 * @param dName 
 * @return 
 */  
public static String geoHash(String key,String dName){  
     Object data = jedis.eval("return redis.call('GEOHASH',KEYS[1],KEYS[2])", 2, key,dName);  
      List resultList = (List)data;  
      if(resultList!=null&&resultList.size() > 0){  
          return resultList.get(0);  
      }  
      return null;  
}  

/** 
 * 查询位置坐标 
 * @param key 
 * @param dName 
 * @return 
 */  
public static List geoPos(String key,String dName){  
     Object data = jedis.eval("return redis.call('GEOPOS',KEYS[1],KEYS[2])", 2, key,dName);  
      List> resultList = (List>)data;  
      if(resultList!=null&&resultList.size() > 0){  
          return resultList.get(0);  
      }  
      return null;  
}  

/** 
 * 查询附近坐标地址 
 * @param key 
 * @param longitude 
 * @param latitude 
 * @param unit 
 * @param asc 
 * @return 
 */  
public static List geoRadius(String key,double longitude,double latitude,int radius,String unit,boolean asc){  
     Object data = jedis.eval("return redis.call('GEORADIUS',KEYS[1],KEYS[2],KEYS[3],KEYS[4],KEYS[5],KEYS[6])", 6, key,String.valueOf(longitude),  
             String.valueOf(latitude),String.valueOf(radius),unit,asc?"ASC":"DESC");  
      return (List)data;  
}  

/** 
 * 根据位置查询附近点 
 * @param key 
 * @param dName 
 * @param unit 
 * @param asc 
 * @return 
 */  
public static List geoRadiusByMember(String key,String dName,int radius,String unit,boolean asc){  
     Object data = jedis.eval("return redis.call('GEORADIUSBYMEMBER',KEYS[1],KEYS[2],KEYS[3],KEYS[4],KEYS[5])", 5, key,dName,String.valueOf(radius),unit,asc?"ASC":"DESC");  
     return (List)data;  
}  

}
增加jar包依赖：
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redis.clients
jedis
2.7.3

参考文章：
1.redis官网lua脚本
2.spring+springdata redis入门教程实现java端调用redis lua脚本片段和lua脚本文件
3.利用redis + lua解决抢红包高并发的问题

原文地址：
http://blog.csdn.net/zhu_tianwei/article/details/49149699
其他介绍：
http://blog.jobbole.com/89225/