FMB/src/ModpackDownloader/downloader1.java

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package ModpackDownloader;

import forgemodpackbuilder.GUI;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;

/**
 *
 * @author simonr
 */


public class downloader1 {

    public static void main(String[] args) throws Throwable {

        String forge10 = "https://files.minecraftforge.net/maven/net/minecraftforge/forge/1.10.2-12.18.2.2107/forge-1.10.2-12.18.2.2107-installer.jar";
        String forge9 = "https://files.minecraftforge.net/maven/net/minecraftforge/forge/1.9.4-12.17.0.2051/forge-1.9.4-12.17.0.2051-installer.jar";
        String forge8 = "https://files.minecraftforge.net/maven/net/minecraftforge/forge/1.8.9-11.15.1.1902-1.8.9/forge-1.8.9-11.15.1.1902-1.8.9-installer.jar";
        String forge7 = "https://files.minecraftforge.net/maven/net/minecraftforge/forge/1.7.10-10.13.4.1614-1.7.10/forge-1.7.10-10.13.4.1614-1.7.10-installer.jar";

        String total = "";
        String version = "";

        if (GUI.version.equals("1.10.2")) {
            version = forge10;
        }
        if (GUI.version.equals("1.9.4")) {
            version = forge9;
        }
        if (GUI.version.equals("1.8.9")) {
            version = forge8;
        }
        if (GUI.version.equals("1.7.10")) {
            version = forge7;
        }
        if (GUI.version.equals("Modpacks")) {
            FileReader fr = new FileReader("./modpack/modpack.txt");
            BufferedReader br = new BufferedReader(fr);
            total = br.readLine();
            System.out.println(total);

            if (total.equals("1.10.2")) {
                version = forge10;
            }
            if (total.equals("1.9.4")) {
                version = forge9;
            }
            if (total.equals("1.8.9")) {
                version = forge8;
            }
            if (total.equals("1.7.10")) {
                version = forge7;
            }
        }

        final URL url = new URL(version);
        final URLConnection conn = url.openConnection();
        try (InputStream is = new BufferedInputStream(conn.getInputStream())) {
            final OutputStream os;
            os = new BufferedOutputStream(new FileOutputStream("./modpack/forge.jar"));
            byte[] chunk = new byte[1024];
            int chunkSize;
            while ((chunkSize = is.read(chunk)) != -1) {
                os.write(chunk, 0, chunkSize);
            }
            os.flush(); // Necessary for Java < 6
            os.close();
        }
    }
}