Java obtains local city geographic location through extranet IP __java

I. Get the extranet IP

public static string Getwebip (string strurl) {
Strurl= "http://www.ip138.com/ip2city.asp";
try {


URL url = new URL (strurl);


BufferedReader br = new BufferedReader (new InputStreamReader (URL


. OpenStream ());


String s = "";


StringBuffer sb = new StringBuffer ("");

String webcontent = "";


while ((s = br.readline ())!= null) {
Sb.append (S + "\ r \ n");


}


Br.close ();
WebContent = Sb.tostring ();
int start = Webcontent.indexof ("[") +1;
int end = Webcontent.indexof ("]");
WebContent = webcontent.substring (start,end);

return webcontent;


catch (Exception e) {
E.printstacktrace ();
Return "Error open URL:" + strurl;


}
}

Two. Approach to geographic location via extranet IP

1.import Java.io.BufferedReader;

Import Java.io.DataOutputStream;
Import Java.io.InputStreamReader;
Import java.net.HttpURLConnection;
Import Java.net.URL;


Import Org.json.JSONObject;


public class Addressutils {


public string GetAddress (string params, string encoding) throws exception{

String Path = "http://ip.taobao.com/service/getIpInfo.php";

String returnstr = this.getrs (path, params, encoding);

Jsonobject Json=null;

if (returnstr!= null) {

JSON = new Jsonobject (RETURNSTR);

if ("0". Equals (Json.get ("code"). ToString ())) {

StringBuffer buffer = new StringBuffer ();

Buffer.append (Decodeunicode (Json.optjsonobject ("Data"). GetString ("country"))/Country

Buffer.append (Decodeunicode (Json.optjsonobject ("Data"). GetString ("area"));/region

Buffer.append (Decodeunicode) (Json.optjsonobject ("Data"). GetString ("region"));/Province

Buffer.append (Decodeunicode) (Json.optjsonobject ("Data"). GetString ("City"))

Buffer.append (Decodeunicode (Json.optjsonobject ("Data"). GetString ("county"));/region





return buffer.tostring ();

}else{

Return "Get address failed?";

}

}

return null;

}
/**
* Get results from URL
* @param path
* @param params
* @param encoding
* @return
*/
public string Getrs (string path, string params, string encoding) {

URL url = null;

HttpURLConnection connection = null;

try {

url = new URL (path);

Connection = (httpurlconnection) url.openconnection ();//New Connection instance

Connection.setconnecttimeout (200000)//Set the connection timeout time, Unit no?

Connection.setreadtimeout (200000)//Set the Read Data timeout, Unit no?

Connection.setdoinput (TRUE);//is the output turned on? True|false

Connection.setdooutput (TRUE);//whether to open the input stream true|false

Connection.setrequestmethod ("POST");//Submit Method post| Get

Connection.setusecaches (false);//whether to cache True|false

Connection.connect ()//Open connection port

DataOutputStream out = new DataOutputStream (Connection.getoutputstream ());

Out.writebytes (params);

Out.flush ();

Out.close ();

BufferedReader reader = new BufferedReader (New InputStreamReader (Connection.getinputstream (), encoding));

StringBuffer buffer = new StringBuffer ();

String line = "";

while (line = Reader.readline ())!= null) {

Buffer.append (line);

}

Reader.close ();

return buffer.tostring ();

catch (Exception e) {

E.printstacktrace ();

}finally{

Connection.disconnect ()//close connection

}

return null;
}
/**
* Character Transfer code
* @param thestring
* @return
*/
public static string Decodeunicode (string thestring) {

Char Achar;

int len = Thestring.length ();

StringBuffer buffer = new StringBuffer (len);

for (int i = 0; i < Len;) {

Achar = Thestring.charat (i++);

if (Achar = = ' \ ') {

Achar = Thestring.charat (i++);

if (Achar = = ' U ') {

int val = 0;

for (int j = 0; J < 4; J + +) {

Achar = Thestring.charat (i++);

Switch (Achar) {

Case ' 0 ':

Case ' 1 ':

Case ' 2 ':

Case ' 3 ':

Case ' 4 ':

Case ' 5 ':

Case ' 6 ':

Case ' 7 ':

Case ' 8 ':

Case ' 9 ':

val = (val << 4) + Achar-' 0 ';

Break

Case ' a ':

Case ' B ':

Case ' C ':

Case ' d ':

Case ' E ':

Case ' F ':

val = (val << 4) + + Achar-' a ';

Break

Case ' A ':

Case ' B ':

Case ' C ':

Case ' D ':

Case ' E ':

Case ' F ':

val = (val << 4) + + Achar-' A ';

Break

Default

throw New IllegalArgumentException (

"Malformed encoding.");
}

}

Buffer.append ((char) val);

}else{

if (Achar = = ' t ') {

Achar = ' t ';
}

if (Achar = = ' R ') {

Achar = ' \ r ';
}

if (Achar = = ' n ') {

Achar = ' \ n ';
}

if (Achar = = ' F ') {

Achar = ' \f ';

}

Buffer.append (Achar);
}

}else{

Buffer.append (Achar);

}

}

return buffer.tostring ();

}


}

2. Obtaining geographical location by means of

public class Getcity {
public string getct (string IP) {
Addressutils addressutils = new Addressutils ();
String address = "";
try {

Address = addressutils.getaddress ("ip=" +ip, "Utf-8");
catch (Exception e) {
E.printstacktrace ();
}
return address;
}
}

For example

public class Test1 {
public static void Main (string[] args) throws Unknownhostexception {
Getcity gc=new getcity ();
Listip ip=new Listip ();
System.out.println (Ip.getwebip ("http://www.ip138.com/ip2city.asp"));
String STR=GC.GETCT (Ip.getwebip ("http://www.ip138.com/ip2city.asp"));
System.out.println (str);
String IP = inetaddress.getlocalhost (). gethostaddress ();
String IP = inetaddress.getlocalhost (). gethostaddress ();
SYSTEM.OUT.PRINTLN (IP);
}


}

Run result is

59.51.18.196
Hengyang, Hunan Province

Note that the Other-json-20090211.jar package must be imported