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]+"\n经度："+latlon[1]+"\n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]+"\n市："+arr[1]+"\n区:"+arr[2]+"\n"+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+"\n";
             }
             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：