Custom mob spawners?

Hey there!

I'm working on a plugin that allows you to mine & craft mob spawners. I got that down pat along with the crafting, but I can't figure out how to make a new crafting recipe for each type of spawner! So basically, what I want it to do would be something like:
To craft a pig spawner = 8 iron ingots and 1 cooked pork in the middle
To craft a zombie spawner = 8 gold ingots and 1 zombie egg in the middle
and so on.
Here's the code for the pig spawner:

Code:java

ItemStack pig_spawner = new ItemStack(Material.MOB_SPAWNER);
        ItemMeta meta = pig_spawner.getItemMeta();
        meta.setDisplayName(ChatColor.GREEN + "Spawner");
        pig_spawner.setItemMeta(meta);
        ShapedRecipe pigrecipe = new ShapedRecipe(new ItemStack(pig_spawner)).shape("###", "#%#", "###").setIngredient('#', Material.IRON_INGOT).setIngredient('%', Material.PORK);
        getServer().addRecipe(pigrecipe);

Please help!