改变数组的输出方式[重复]

Question

所以我正在使用 GSON 库将用户输入的数组输出到 .json 文件，我想知道如何以某种方式对其进行编码，以便输出不带注释的信息，以便更轻松地导入 .json文件回到数组中？

我将展示代码以及数组是如何输出的，这样更有意义。

Postit.java

package postit;

import java.util.Scanner;

class Postit {
public static Scanner menu = new Scanner(System.in);
public static void main(String[] args) throws Exception {

    int MenuOption = 0;

    NewStorage G = new NewStorage();    // Case 1 Object



    while(MenuOption != 3){



        System.out.println(

                "\n--------Note System-------\n" +
                        "----------------------------\n" +
                        "1.   Create a Note \n" +
                        "2.   View Notes \n" +
                        "3.   Close Program\n" +
                        "4.   Write File\n" +
                        "5.   Test code\n" +
                        "----------------------------\n");

        MenuOption = menu.nextInt();
        menu.nextLine();

        switch (MenuOption) {

            case 1:


                G.printinfo();
                G.Notestore();

                break;

            case 2:

                G.viewNotes();
                G.printNotes();
                break;

            case 3:

                System.out.println("Program is closing");
                System.exit(0);


                break;

            case 4:


                G.writeFile();


                System.out.println("Done.");
                break;

            case 5:

                G.Gsontest();
                break;

           default:

                System.out.println("Invalid choice.");

                break;
        }
    }
}
}

NewStorage.java

package postit;

import java.util.Scanner;
import java.util.ArrayList;


import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

class NewStorage {
Gson gson = new Gson();


ArrayList<Note> NoteArray = new ArrayList<Note>(20);

public void printinfo() {
    System.out.println("--- Fill note here  ---");
}



public void Gsontest() {
    String userJson = gson.toJson(NoteArray.toString());
    gson.toJson(userJson, System.out);
    }

public void Notestore() {
    System.out.println("Enter the note ID you wish to attach the note with\n\n");
    String inputIDnote = Postit.menu.nextLine();
    System.out.println("Enter your note\n\n");
    String noteDescription = Postit.menu.nextLine();
    NoteArray.add(new Note(inputIDnote, noteDescription));
}

public void viewNotes() {
    System.out.println("Please enter the number of the note you wish to view.");
    int count = 0;

    for (int i = 0; i < NoteArray.size(); i++) {
        System.out.println((count++) + ": " + NoteArray.get(i).inputIDnote);
    }
}

public void printNotes() {

    int count = Postit.menu.nextInt();
    Postit.menu.nextLine();

    System.out.println(count + " " + NoteArray.get(count));
}

public void writeFile() throws IOException {

    try
        (Writer writer = new FileWriter("src\\Output.json"))
        {
            Gson gson = new GsonBuilder().create();
            for (int i = 0; i < NoteArray.size(); i++) {
                gson.toJson(NoteArray.get(i).toString(), writer);
            }
            writer.close();
        }
    }
}

note.java

package postit;

class Note {



String  inputIDnote;
String  noteDescription;
    public Note(String inputIDnote, String noteDescription) {
   this.inputIDnote = inputIDnote;
   this.noteDescription = noteDescription;
}
@Override
public String toString() {
    return "\n\n" + "ID: " + inputIDnote + "\n\n" + " Description: " + 
 noteDescription;
 }

 }

.json文件是这样输出的

"\n\nID：ID1\n\n 描述：NOTE1""\n\nID：ID2\n\n 描述：NOTE2"

添加以下值

ID = ID1 描述 = NOTE1 ID = ID2 描述 - NOTE2

Answer 1

要使用 Gson 序列化您的数组，请执行此操作。

public void writeFile() throws IOException {
    try (Writer writer = new FileWriter("src\\Output.json")) {
            Gson gson = new Gson();
            gson.toJson(NoteArray, writer);
        }
    }
}