杰克逊序列化列表实体（加场到根目录）

问题描述：

@Entity 
public class Product extends AbstractBaseEntity { 

    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Type(type = "objectid") 
    private String id; 
    private String title;

我的资源

@Path(value = ApiConstant.Urls.PRODUCTS) 
public class ProductResource { 

    @Inject 
    private ProductService productService; 

    @GET 
    @Path(value = ApiConstant.Urls.PRODUCTS) 
    @Produces(value = MediaType.APPLICATION_JSON) 
    public List getProducts(){ 
     return productService.findAll(); 
    }

我JSON响应

[ { 
    "id" : "596b6a02f70a0878590bcf08", 
    "title" : "test1", 
    "description" : "description test 1" 
}, { 
    "id" : "596b6b00f70a087b72d377eb", 
    "title" : "test1", 
    "description" : "description test 1" 
}, { 
    "id" : "596b6b75f70a087d40f580d5", 
    "title" : "test1", 
    "description" : "description test 1" 
} ]

我想创建一个计数字段对这样的列表中的项目进行计数并将该列表添加到结果字段

{ 
    "count": 3, 
    "results": [ 
    { 
     "id" : "596b6a02f70a0878590bcf08", 
     "title" : "test1", 
     "description" : "description test 1" 
    }, { 
     "id" : "596b6b00f70a087b72d377eb", 
     "title" : "test1", 
     "description" : "description test 1" 
    }, { 
     "id" : "596b6b75f70a087d40f580d5", 
     "title" : "test1", 
     "description" : "description test 1" 
    } ], 
}

我想序列由JPA持续返回商品目录

您可以创建一个新的类'ProductsWrapper'与'count'和'results'然后在'getProducts'方法创建的这个实例，而是返回它的名单。 – tima

答

您可以使用下面的类包括计数与Product实体的名单一起：

public class ResultList { 
    private int count; 
    @JsonProperty("results") private List<Product> products; 

    public List<Product> getProducts() { 
     return products; 
    } 

    public void setProducts(List<Product> products) { 
     this.products = Objects.requireNonNull(products, "products"); 
     this.count = products.size(); 
    } 

    public int getCount() { 
     return count; 
    } 
}

太好了......感谢您的帮助 – Pako

答

类泛型type

public class ResultList<T> { 

    private int count; 
    @JsonProperty("results") 
    private List<T> items; 

    public List<T> getItems() { 
     return items; 
    } 

    public void setItems(List<T> items) { 
     this.items = Objects.requireNonNull(items, "items"); 
     this.count = items.size(); 
    } 

    public int getCount() { 
     return count; 
    } 
}

ProductResource

@GET 
@Path(value = ApiConstant.Urls.PRODUCTS) 
@Produces(value = MediaType.APPLICATION_JSON) 
public ResultList getProducts(){ 
    List products = productService.findAll(); 
    ResultList result = new ResultList<Product>(); 
    result.setItems(products); 
    return result; 

}

感谢@ CK1

杰克逊序列化列表实体（加场到根目录）

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