URLEncoder declares the following class method for encoding a string:
String encode(String s, String enc)
import java.net.URLEncoder;
public class Main {
public static void main(String[] argv) throws Exception {
String uid = new java.rmi.server.UID().toString(); // guaranteed unique
String s = URLEncoder.encode(uid,"UTF-8"); // encode any special chars
System.out.println(s);//455251f6%3A1392632d968%3A-8000
}
}