Question 110514 in Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

Json – How do I edit the ResponseEntity of a Get-Request in Java Spring?

I have a small Java Springboot backend and a mySQL database. The data class for the objects to be saved in the database looks as follows:

    @Entity
    public class Product {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private int id;
    
        private String name;
    
        private String category;
    
        private LocalDate expirationDate;
    
        // getters, setters ...

The GET method within the controller class looks like this:

@GetMapping("/products")
public ResponseEntity<Iterable<Product>> getProducts() {
   return ResponseEntity.ok(productRepository.findAll());
}

Now the json I get back when posting a GET-request formats the expirationDate property as int[], like this:

"expirationDate": [
            2023,
            1,
            22
        ]

How do I manage to format this while creating the json for it to look like yyyy-mm-dd, as this is the format I also use to POST it. Also, as I’m writing my frontend in Blazor (C#), I need a format that gets easily translated into a DateOnly property in the C# data class.

Tags:

2

Answers


  1. 0

    change the controller to return List of products as follows:

    @GetMapping("/products")
public ResponseEntity<List<Product>> getProducts() {
    return ResponseEntity.ok(productRepository.findAll());
}

    Also, I recommend to use lombok and put @Data anotation on your Entity.

    I just reproduce yours and you will got the data like this:

    [
{
    "id": 1,
    "name": "Iphone",
    "category": "apple",
    "expirationDate": "2022-12-23"
},
{
    "id": 2,
    "name": "Samsung",
    "category": "samsung",
    "expirationDate": "2022-12-23"
}
]

    Incase you need, this is your post mapping:

    @PostMapping("/products")
public Product createProduct(@RequestBody Product product) {
    productRepository.save(product);
    return product;
}
    Login or Signup to reply.
  2. 0

    I think you are missing something with the serialisation, do you know which lib you are using to serialize data to json ? (If not, can you copy/paste your dependency config file ? (pom.xml if you use maven)

    If you use jackson for example, you need to add specific dependencies to your project, to have a proper serialization of dates. (You can refer to Java 8 LocalDate Jackson format for instance)

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search