Bukkit编程之动态向yml文件中添加属性

 yaml = new Yaml();
             String goods = args[0];
             String goodsNum = args[1];

             YamlConfiguration yc = new YamlConfiguration();
             try {
                 yc.load(new File(System.getProperty("user.dir")+"/plugins/PbMainPlugin/configDef.yml"));
             } catch (FileNotFoundException e1) {

                 e1.printStackTrace();
             } catch (IOException e1) {

                 e1.printStackTrace();
             } catch (InvalidConfigurationException e1) {

                 e1.printStackTrace();
             }

             Set set = yc.getConfigurationSection("drop").getKeys(false);

             lastDropNum = set.size();  //查看yml文件中是否有内容，没有内容返回0，否则返回内容长度

             player.sendMessage("大小是："+set.size()+"");
             player.sendMessage("内容是："+set+"");
             YamlConfiguration yamlConfiguration = new YamlConfiguration();
             if(lastDropNum==0) { //如果原来yml文件中没有内容

                 ConfigurationSection drop = yamlConfiguration.createSection("drop");

                 Map<String, Object> item = new HashMap();
                 item.put("item-Id", Material.valueOf(goods.trim()).getId());
                 item.put("item-Name", Material.valueOf(goods.trim()).name());
                 drop.createSection("1",item);
                 try {

                     yamlConfiguration.save(System.getProperty("user.dir")+"/plugins/PbMainPlugin/configDef.yml");
                 } catch (IOException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }

             }

             if(lastDropNum!=0) { //如果yml中有内容，则向yml文件中追加新的内容
                 yamlConfiguration = YamlConfiguration.loadConfiguration(new File(System.getProperty("user.dir")+"/plugins/PbMainPlugin/configDef.yml"));
                 ConfigurationSection drop = yamlConfiguration.getConfigurationSection("drop");
                 Map<String, Object> item = new HashMap();
                 item.put("item-Id", Material.valueOf(goods.trim()).getId());
                 item.put("item-Name", Material.valueOf(goods.trim()).name());
                 drop.set((lastDropNum+1)+"", item);
                 try {
                     yamlConfiguration.save(System.getProperty("user.dir")+"/plugins/PbMainPlugin/configDef.yml");
                 } catch (IOException e) {

                     e.printStackTrace();
                 }

             }

             //向玩家背包中添加物品
             PlayerInventory inventory = player.getInventory();
             ItemStack itemStack = new ItemStack(Material.valueOf(goods.trim()),Integer.parseInt(goodsNum));
             inventory.addItem(itemStack);
             return true;

yml文件中的结构为：