Practice
To determine a location by IP using the IpGeoBase service, we will implement:
Here is what the straightforward Location class looks like:
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public class Location {
private String country = "";
private String city = "";
private String address = "";
private double latitude;
private double longitude;
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public double getLatitude() {
return latitude;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
public double getLongitude() {
return longitude;
}
public void setLongitude(double longitude) {
this.longitude = longitude;
}
}
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We also recommend reading: Converting a number to its text representation in JavaScript
The method for obtaining the location:
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public Location getIpGeoBaseDataByIp(String ip) {
Location loc = new Location();
try {
JAXBContext jaxbContext = JAXBContext
.newInstance(IpGeoBaseLocation.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
IpGeoBaseLocation ipGeoBaseLocation = (IpGeoBaseLocation) jaxbUnmarshaller
.unmarshal(new ByteArrayInputStream(makeGetRequest(
"http://ipgeobase.ru:7020/geo?ip=" + ip).getBytes()));
if (ipGeoBaseLocation.getIp().getCity() != null) {
loc.setCity(ipGeoBaseLocation.getIp().getCity());
}
if (ipGeoBaseLocation.getIp().getDistrict() != null) {
loc.setCountry(ipGeoBaseLocation.getIp().getCountry());
}
if (ipGeoBaseLocation.getIp().getRegion() != null) {
loc.setAddress(ipGeoBaseLocation.getIp().getRegion());
}
if (ipGeoBaseLocation.getIp().getLat() != 0) {
loc.setLatitude(ipGeoBaseLocation.getIp().getLat());
}
if (ipGeoBaseLocation.getIp().getLng() != 0) {
loc.setLongitude(ipGeoBaseLocation.getIp().getLng());
}
return loc;
} catch (Exception e) {
e.printStackTrace();
}
return loc;
}
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We create a Location instance that we will later fill with data. We obtain a JAXBContext instance by calling the static newInstance() method, passing it the class to which the XML response will be “bound”, then create an unmarshaller and call its unmarshal() method, passing in a byte stream of the received XML document – as a result, after casting to IpGeoBaseLocation, we use that ipGeoBaseLocation instance to populate our location object and return it.
The method used to perform the GET request:
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private static String makeGetRequest(String URL) throws IOException {
URL url = new URL(URL);
URLConnection connection = url.openConnection();
connection.setDoOutput(true);
StringBuffer response = new StringBuffer();
BufferedReader reader = new BufferedReader(new InputStreamReader(
connection.getInputStream(), "windows-1251"));
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
return response.toString();
}
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The IpGeoBaseLocation class:
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import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "ip-answer")
public class IpGeoBaseLocation {
private IpGeoBaseIP ip;
public IpGeoBaseIP getIp() {
return ip;
}
@XmlElement
public void setIp(IpGeoBaseIP ip) {
this.ip = ip;
}
public static class IpGeoBaseIP {
private String inetnum;
private String country;
private String city;
private String region;
private String district;
private double lat;
private double lng;
public String getInetnum() {
return inetnum;
}
@XmlElement
public void setInetnum(String inetnum) {
this.inetnum = inetnum;
}
public String getCountry() {
return country;
}
@XmlElement
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
@XmlElement
public void setCity(String city) {
this.city = city;
}
public String getRegion() {
return region;
}
@XmlElement
public void setRegion(String region) {
this.region = region;
}
public String getDistrict() {
return district;
}
@XmlElement
public void setDistrict(String district) {
this.district = district;
}
public double getLat() {
return lat;
}
@XmlElement
public void setLat(double lat) {
this.lat = lat;
}
public double getLng() {
return lng;
}
@XmlElement
public void setLng(double lng) {
this.lng = lng;
}
}
}
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