发送给 BODY 发布者的 JSON 对象

Question

我正在开发一个项目，我请求 api 来发布项目详细信息。以下是我尝试使用 HttpRequest 插入正文 itemstr 的代码

 public void test(){
        newItem item = new newItem(12,12,12,21,"waiwai");
        JSONObject itemobj = new JSONObject(item);
        String itemStr = itemobj.toString();
        System.out.println(itemStr);
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder().uri(URI.create("http://localhost:3001/postMongo")).POST(HttpRequest.BodyPublishers.ofString(itemStr)).build();

    }

这是我的 newItem 类

public class newItem {
    int id,wholesaleRate,SellingPrice,stock;
    String name;

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getWholesaleRate() {
        return wholesaleRate;
    }

    public void setWholesaleRate(int wholesaleRate) {
        this.wholesaleRate = wholesaleRate;
    }

    public int getSellingPrice() {
        return SellingPrice;
    }

    public void setSellingPrice(int sellingPrice) {
        SellingPrice = sellingPrice;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public newItem(int id, int wholesaleRate, int sellingPrice, int stock, String name) {
        this.id = id;
        this.wholesaleRate = wholesaleRate;
        this.SellingPrice = sellingPrice;
        this.stock = stock;
        this.name = name;
    }
}

我正在尝试将 itemStr 作为主体发布到我在本地运行的 Restful API。我可以使用 GET 请求进行检索，但无法发布。

Answer 1

OpenJDK 发布了桥接新 Java 11 HTTP 客户端和 Jackson 的方法： http://openjdk.java.net/groups/net/httpclient/recipes.html#jsonPost

ObjectMapper objectMapper = new ObjectMapper();
String requestBody = objectMapper
      .writerWithDefaultPrettyPrinter()
      .writeValueAsString(map);

HttpRequest request = HttpRequest.newBuilder(uri)
      .header("Content-Type", "application/json")
      .POST(BodyPublishers.ofString(requestBody))
      .build();

return HttpClient.newHttpClient()
      .sendAsync(request, BodyHandlers.ofString())
      .thenApply(HttpResponse::statusCode)
      .thenAccept(System.out::println);

希望杰克逊很快就能实现BodyPublisher自己，而不必先序列化为字符串......