How to use cURL in Java?

Question

I am a newbie in java and wanted to use curl in java. What is my question is curl built-in in java or I have to install it from any 3rd party source to use with Java. If so,

Answer 1

Use Runtime to call Curl. This code works for both Ubuntu and Windows.

String[] commands = new String {"curl", "-X", "GET", "http://checkip.amazonaws.com"};
Process process = Runtime.getRuntime().exec(commands);
BufferedReader reader = new BufferedReader(new 
InputStreamReader(process.getInputStream()));
String line;
String response;
while ((line = reader.readLine()) != null) {
    response.append(line);
}