I'm trying to learn, and I'm having a hard time reading an XML catching via WEB and turning it into an object. There is a ready code in which it makes the connection to the site, and another that a friend has shown me that I should pass the XML to an object however this does not occur. Can you point me to bugs in this code? I do not find clear examples of how to access a website and get information.
Main Class:
com.mkyong;
import com.sun.jmx.remote.internal.Unmarshal;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
public class HttpURLConnectionExample {
private final String USER_AGENT = "Mozilla/5.0";
public static void main(String[] args) throws Exception {
HttpURLConnectionExample http = new HttpURLConnectionExample();
System.out.println("Testing 1 - Send Http GET request");
http.sendGet();
// System.out.println("\nTesting 2 - Send Http POST request");
// http.sendPost();
}
// HTTP GET request
private void sendGet() throws Exception {
String url = "http://teste.com/car.xml";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
//add request header
con.setRequestProperty("User-Agent", USER_AGENT);
int responseCode = con.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
try {
//Transforma xml em objeto
JAXBContext aXBContext = JAXBContext.newInstance(Car.class);
Unmarshaller cu = aXBContext.createUnmarshaller();
Car car = (Car) cu.unmarshal(in);
if(car != null){
System.out.println("Não é nulo!");
}
} catch (Exception e) {
}
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
System.out.println(response.toString());
}
Car class:
package com.mkyong;
public class Car {
private String manufacturerCar;
private String modelCar;
private String doorsCar;
private String gearshift;
public String getManufacturerCar() {
return manufacturerCar;
}
public void setManufacturerCar(String manufacturerCar) {
this.manufacturerCar = manufacturerCar;
}
public String getModelCar() {
return modelCar;
}
public void setModelCar(String modelCar) {
this.modelCar = modelCar;
}
public String getDoorsCar() {
return doorsCar;
}
public void setDoorsCar(String doorsCar) {
this.doorsCar = doorsCar;
}
public String getGearshift() {
return gearshift;
}
public void setGearshift(String gearshift) {
this.gearshift = gearshift;
}
@Override
public String toString() {
return "Car{" + "manufacturerCar=" + manufacturerCar + ", modelCar=" + modelCar + ", doorsCar=" + doorsCar + ", gearshift=" + gearshift + '}';
}
}
Follow the XML
<Car>
<manufacturerCar>VW</manufacturerCar>
<modelCar>Fusca</modelCar>
<doorsCar>2</doorsCar>
<gearshift>Manual</gearshift>
</Car>
Well, thank you in advance!