使用Spring Boot自定义JSON响应

Question

我开发了一个spring boot应用程序，在控制器中我有一个返回产品列表的方法

@GetMapping
public ResponseEntity<List<Product>> listAllProducts() {
    List<Product> products = productRepository.findAll();
    if (products.isEmpty()) {
        return new ResponseEntity<List<Product>>(HttpStatus.NO_CONTENT);
    }
    return new ResponseEntity<List<Product>>(products, HttpStatus.OK);
}

结果如下：

[
{
    "name": "Ruby on Rails Baseball Jersey",
    "description": null,
    "price": 19.99,
    "slug": "ruby-on-rails-tote"
},
{
    "name": "Ruby on Rails Baseball Jersey",
    "description": null,
    "price": 19.99,
    "slug": "ruby-on-rails-tote"
},
{
    "name": "Ruby on Rails Baseball Jersey",
    "description": null,
    "price": 19.99,
    "slug": "ruby-on-rails-tote"
}
]

如何修改方法listAllProducts，以便结果如下所示

{
"products": [
    {
        "name": "Ruby on Rails Baseball Jersey",
        "description": null,
        "price": 19.99,
        "slug": "ruby-on-rails-tote"
    },
    {
        "name": "Ruby on Rails Baseball Jersey",
        "description": null,
        "price": 19.99,
        "slug": "ruby-on-rails-tote"
    },
    {
        "name": "Ruby on Rails Baseball Jersey",
        "description": null,
        "price": 19.99,
        "slug": "ruby-on-rails-tote"
    }
]
}

Answer 1

一个简单的方法是使用包含ProductListDto的List<Product>。

public class ProductListDto {       
    private List<Product> products;     
    public ProductListDto() {}      
    public ProductListDto(List<Product> products) {
        this.products = products;
    }       
}    

然后：

@GetMapping
public ResponseEntity<ProductListDto> listAllProducts() {
    List<Product> products = productRepository.findAll();
    if (products.isEmpty()) {
        return new ResponseEntity<ProductListDto>(HttpStatus.NO_CONTENT);
    }
    ProductListDto productListDto = new ProductListDto(products);
    return new ResponseEntity<ProductListDto>(productListDto, HttpStatus.OK);
}

Answer 2

创建一个模型类

public class Products {
    private List<Product> products = null;
}

并修改您的ResponseEntity以返回Products而不是List

   public ResponseEntity<Products> listAllProducts()

这应该为你解决