My current project involves delving into Jackson to gain a better understanding of how it works. I am in the process of creating a simple program that can both read from and write to a file, specifically storing JSON data in it. This project revolves around maintaining a list of shopping lists, each consisting of a store name and items related to that store.
However, I have encountered an obstacle while attempting to append new entries (in JSON format) to the end of the file. Here's what I have managed to accomplish so far; feel free to skip over the initial part as it merely includes a basic console scanner for user input:
public class JacksonExample {
static ObjectMapper mapper = new ObjectMapper();
static File file = new File("C:/Users/stephen.protzman/Desktop/user.json");
static List<ShoppingList> master = new ArrayList<ShoppingList>();
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
boolean running = true;
while (running) {
System.out.println("[ 1 ] Add a new shopping list");
System.out.println("[ 2 ] View all shopping lists");
System.out.println("[ 3 ] Save all shopping lists");
int choice = Integer.parseInt(in.nextLine());
switch (choice) {
case 1:
getNewList();
case 2:
display();
case 3:
running = false;
}
}
in.close();
}
// Additional methods omitted for brevity...
}
I am keen on continuing to utilize the ObjectMapper functionality since my goal is to learn more about Jackson. However, I haven't yet discovered a way to effectively append new data. Any suggestions or insights are highly appreciated!