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：