分裂字符串的想法？

Question

我正在製作一個保存媒體項目（如dvd或視頻遊戲）的庫，並保存媒體項目列表的文件。我必須製作一種方法，可以讀取保存文件中的數據，重新創建媒體項目並將其放入列表中。我正在考慮將其標記，但我無法弄清楚如何開始。有什麼建議麼？我正在使用java。每個媒體項目包含一個字符串標題，字符串格式，布爾借用，字符串名稱和字符串日期。該方法將用於啓動程序時加載保存文件。

Answer 1

您可以使用序列化將數據保存到文件並讀回。儘管如此，你將無法閱讀文本。

public class MediaSave { 
    public static class Media implements Serializable{ 
     /** 
     * 
     */ 
     private static final long serialVersionUID = 7452860232014574705L; 
     public String title; 
     public String format; 
     public Boolean borrowed; 
     public String name; 
     public Date date; 
     protected Media(String title, String format, Boolean borrowed, 
       String name, Date date) { 
      super(); 
      this.title = title; 
      this.format = format; 
      this.borrowed = borrowed; 
      this.name = name; 
      this.date = date; 
     } 
     public String toString(){ 
      return title + " " + format + " " + borrowed + " " + name + " " + " " + date ; 
     } 
    } 
    public static void main(String[] args) throws IOException, ClassNotFoundException{ 
     Media[] media = new Media[4]; 
     media[0] = new Media("Avatar1", "dvd",true, "jon1", new Date()); 
     media[1] = new Media("Avatar2", "dvd",true, "jon2", new Date()); 
     media[2] = new Media("Avatar3", "dvd",true, "jon3", new Date()); 
     media[3] = new Media("Avatar4", "dvd",true, "jon4", new Date()); 
     Path p = Paths.get("resources/media.txt"); 
     File f = p.toFile(); 
     if(!f.exists()){ 
      f.createNewFile(); 
     } 


     try(ObjectOutputStream writer = new ObjectOutputStream(new FileOutputStream(f))){ 
      writer.writeInt(media.length); 
      for(Media m : media){ 
      writer.writeObject(m); 
      } 
     } 
     try(ObjectInputStream reader = new ObjectInputStream(new FileInputStream(f))){ 
      int cnt = reader.readInt(); 
      for(int i =0 ; i != cnt;i++){ 
        Media m=(Media)reader.readObject(); 
        System.out.println(m.toString()); 
      } 
     } 
    } 
}