更改阵列输出的方式

Question

因此，我正在使用gson libary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，以便它在没有注释的情况下输出信息使.json文件重新将.json文件导入数组？

变得更容易

我将显示代码以及如何输出数组，因此更有意义。

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 Programn" +
                        "4.   Write Filen" +
                        "5.   Test coden" +
                        "----------------------------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 withnn");
    String inputIDnote = Postit.menu.nextLine();
    System.out.println("Enter your notenn");
    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 "nn" + "ID: " + inputIDnote + "nn" + " Description: " + 
 noteDescription;
 }
 }

.json文件像以下那样输出

" n nid：id1 n n描述：note1" n nid：id2 n n描述：note2：note2"

添加了以下值

id = id1描述= note1ID = ID2说明-Note2

Answer 1

使用gson序列化您的数组。

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