Java应用：经纬度匹配（geohash加密）

本文采用http://gc.ditu.aliyun.com地址进行经纬度匹配，无数量限制

如果给定经纬度进行geohash加密操作，先解密得到相应gps坐标，具体程序如下所示：

import java.text.DecimalFormat;
import java.util.BitSet;
import java.util.HashMap;

public class Lon_Lat {
    
    public static String location;
    public static String strlatlon[];
    
    private static int numbits=5*7;
    final static char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8',            
            '9', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p',
            'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
    final static HashMap<Character,Integer> lookup=new HashMap<Character,Integer>();
    static {
        int i = 0;
        for (char c : digits) {
            lookup.put(c, i++);
        }    
    }
    
    public static void main(String ages) {
        double[] latlon=new Lon_Lat().decode(ages);
        Location loc=new Location();
        strlatlon=new String[2];
        
        strlatlon[0]=String.valueOf(latlon[0]);
        strlatlon[1]=String.valueOf(latlon[1]);
        loc.main(strlatlon);
        
        location=loc.location;
        
        //System.out.println("纬度："+latlon[0]+"
经度："+latlon[1]+"
地址："+location);
    }
    /* 
     * 将GeoHash字串解码成经纬度
     */
    public double[] decode(String geohash) {
        StringBuffer buffer=new StringBuffer();
        for(char c:geohash.toCharArray()) {
            int i=lookup.get(c);
            String _buffer=Integer.toBinaryString(i);
            //_buffer=String.format("%05d",_buffer);
            if(_buffer.length()==1)
                _buffer="0000"+_buffer;
            else if(_buffer.length()==2)
                _buffer="000"+_buffer;
            else if(_buffer.length()==3)
                _buffer="00"+_buffer;
            else if(_buffer.length()==4)
                _buffer="0"+_buffer;
            //System.out.println("i:"+i+"   "+_buffer);
            buffer.append(_buffer);
            
        }
        //System.out.println(buffer);
        
        BitSet lonset=new BitSet();
        BitSet latset=new BitSet();
        
        int j=0;
        for(int i=0;i<numbits*2;i+=2) {
            boolean isSet=false;
            if(i<buffer.length())
                isSet=buffer.charAt(i)=='1';
            lonset.set(j++, isSet);
        }
        
        j=0;
        for(int i=1;i<numbits*2;i+=2) {
            boolean isSet=false;
            if(i<buffer.length())
                isSet=buffer.charAt(i)=='1';
            latset.set(j++, isSet);
        }
        
        double lat=decode(latset,-90,90);
        double lon=decode(lonset,-180,180);
        
        DecimalFormat df=new DecimalFormat("0.000000");
        return new double[] {Double.parseDouble(df.format(lat)),Double.parseDouble(df.format(lon))};
    }
    
    /*
     * 根据二进制编码串和指定的数值变化范围计算得到经纬值
     */
    private double decode(BitSet bs,double floor,double ceiling) {
        double mid=0;
        for(int i=0;i<bs.length();i++) {
            mid=(floor+ceiling)/2;
            if(bs.get(i)) 
                floor=mid;
            else
                ceiling=mid;
        }
        return mid;
    }

}

根据上述得到的地址进行地址匹配，具体程序如下：

import java.net.URL;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class Location {
    public static String location;
    public static  void main(String ags[]) {
        
        String add=getAdd("40.072632","116.424866");
        //System.out.println(add.substring(0,1));
        
        JSONObject jsonObject=JSONObject.fromObject(add);
        JSONArray jsonArray=JSONArray.fromObject(jsonObject.getString("addrList"));
        JSONObject j_2=JSONObject.fromObject(jsonArray.get(1));
        String allAdd=j_2.getString("admName");
        String addr=j_2.getString("addr");
        String name=j_2.getString("name");
        
        //String loc=allAdd+addr+name;
        String arr[]=allAdd.split(",");
        if(arr.length==3) {
            if(arr[0]==arr[1]) 
                location=arr[0]+arr[2]+addr+name;
            else 
                location=arr[0]+arr[1]+arr[2]+addr+name;
        }else {
            if(arr[0]==arr[1])
                location=arr[0]+addr+name;
            else
                location=arr[0]+arr[1]+addr+name;
        }
        
        System.out.println(allAdd+addr+name);
        System.out.println("省："+arr[0]+"
市："+arr[1]+"
区:"+arr[2]+"
"+name);
    }
    public static  String getAdd(String lat,String lon) {
        String urlString="http://gc.ditu.aliyun.com/regeocoding?l="+lat+","+lon+"type=010";
        String res="";
        try {
            URL url=new URL(urlString);
            java.net.HttpURLConnection conn=(java.net.HttpURLConnection)url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            java.io.BufferedReader in=new java.io.BufferedReader(new java.io.InputStreamReader(conn.getInputStream(),"UTF-8"));
            String line;
            while((line=in.readLine())!=null) {
                res+=line+"
";
            }
            in.close();
        }catch(Exception e) {
            System.out.println("error in wapaction,and e is"+e.getMessage());
        }
        //System.out.println(res);
        return res;
    }
    
}

地址匹配信息如下，可按名称提取相应信息：