java - 如何将文本文件中的数据集以空行分隔

Question

我有一个包含膳食食谱的文本文件，其中每个食谱用空行分隔。食谱由名称、烹饪时间和配料组成，所有这些都在单独的一行中。th=is 之后是一个空行，然后下一个配方将随之而来。

我创建了一个食谱类来存储每个食谱和一个食谱管理器类，然后将所有食谱存储在一个列表中，并且还将包含各种方法来根据成分等字段搜索食谱。

我有一种方法可以在第一个空白行之前读取第一个食谱，然后将数据放在一个临时列表中，然后使用它为食谱创建 Recipe 对象，然后将其存储在将保存食谱列表的 RecipeManager 对象中. 我需要一次从 txt 文件（以空行分隔）中读取食谱，这就是我需要一些帮助和指导的地方。下面是txt文件和相关的类文件。

食谱.txt：

Pancake dough
60
milk
egg
flour
sugar
salt
butter

Meatballs
20
ground meat
egg
breadcrumbs

Tofu rolls
30
tofu
rice
water
carrot
cucumber
avocado
wasabi

用户界面.java

public class UserInterface {
    private Scanner scanner;
    private RecipesManager manager; //object to hold list of recipes with access to varous methods to search for recipes

    public UserInterface(Scanner scanner, RecipesManager manager) {
        this.scanner = scanner;
        this.manager = manager;
    }
    
    public void start(){
        System.out.println("File to read: ");
        String input = scanner.nextLine();
        System.out.println("Commands: ");
        System.out.println("list - lists the recipes");
        System.out.println("stop - stops the program");
        readFile(input);
        
    }
    
    private void readFile(String fileName){ //method to read the recipes from the text file
        ArrayList<String> recipe = new ArrayList<>(); //List to store recipe that is to be read
        try {
            Scanner file = new Scanner(Paths.get(fileName));
            while(file.hasNext()){
                String line = file.nextLine();
                recipe.add(line);
            }
            createRecipe(recipe);
            System.out.println(recipe);
            
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        } //currently reads all the lines in the text file but need it to read one recipe at a time 
    }
    
    private void createRecipe(ArrayList<String> recipe){ //method to create recipe object and then store in a list of recipes (RecipeManager)
        String name = recipe.get(0);
        int time = Integer.valueOf(recipe.get(1)); //convert the time in String format to Integer
        ArrayList<String> ingredients = new ArrayList<>(); //list of ingredients
        for(int i=2; i<recipe.size(); i++){ //add ingredients found from index 2 onwards, to the ingredients list
            ingredients.add(recipe.get(i));
        }
        
        manager.addRecipe(new Recipe(name, time, ingredients)); //add to the list of recipes in the RecipeManager object
    }
    
}  

标签： java