我试图将java对象发布到.net核心web api中，但我需要用java发布对象数组

因此，我尝试从Java编写一个表单post。到我的.net核心webapi。直到我添加了发送内部对象数组的要求，表单post才运行得很好。我想相信，当我发表文章时，我的.net并没有理解它接收到的有效载荷。因此，下面的java代码将值发送到.NETCore。在假定收集（绑定）来自java代码的请求的模型之后，也将粘贴该请求

//此方法将把值发布到.net

public  <T> T  Handlepost(File inFile,Productmodel model,final Class<T> objectClass)  {

    FileInputStream fis = null;

    try {
                    StringBody name = new StringBody(model.getName());
                    StringBody barcode = new StringBody(model.getBarcode());
                    StringBody quantity = new StringBody(model.getStockQuantity()+"");
                    StringBody unitcost = new StringBody(model.getUnitCost()+"");            
                    StringBody discountamt = new StringBody(model.getDiscountamt()+"");
                    StringBody describe = new StringBody(model.getDescription());
                    StringBody companyid = new StringBody(model.getCompanyID()+"");
                    StringBody unitid = new StringBody(model.getUnit().getID());
                    StringBody inventorycatid = new StringBody(model.getProductposcategory().getID());

                    String hascolors = "";
                    if(model.getHascolortypes()){
                        hascolors = "yes";
                    }
                    else
                        hascolors = "no";

                    StringBody hascolortypes = new StringBody(hascolors);

                    if(inFile != null){
        fis = new FileInputStream(inFile);
                    }
        DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());


                    String Posturl = urlobject.Createproducturl();
        // server back-end URL
        HttpPost httppost = new HttpPost(Posturl); //"http://localhost:56175/api/product/create"
        MultipartEntity entity = new MultipartEntity();

        // set the file input stream and file name as arguments
                    if(inFile != null)
        entity.addPart("Image", new InputStreamBody(fis, inFile.getName()));


                    entity.addPart("Name", name);
                    entity.addPart("Barcode",barcode);
                    entity.addPart("StockQuantity", quantity);
                    entity.addPart("UnitCost", unitcost);
                    entity.addPart("Discountamt", discountamt);
                    entity.addPart("Description", describe);
                    entity.addPart("CompanyID", companyid);
                    entity.addPart("Unit.ID",unitid);
                    entity.addPart("Hascolortypes", hascolortypes);
                    entity.addPart("InventorycategoryID",inventorycatid);

                   // Gson gson = new Gson();
                  /*  String json  = new JSONArray(model.getCostpersizes()).toString(); //gson.toJson(model.getCostpersizes());

                    StringBody productprices = new StringBody(json);                     
                     entity.addPart("Costpersizes", productprices);*/

public T Handlepost（文件填充、产品模型、最终类objectClass）{
FileInputStream fis=null；
试一试{
StringBody名称=新的StringBody（model.getName（））；
StringBody条码=新的StringBody（model.getBarcode（））；
StringBody数量=新的StringBody（model.getStockQuantity（）+）；
StringBody单位成本=新的StringBody（model.getUnitCost（）+）；
StringBody Dispentamt=新的StringBody（model.getDispentamt（）+）；
StringBody description=新的StringBody（model.getDescription（））；
StringBody companyid=新的StringBody（model.getCompanyID（）+）；
StringBody unitid=新的StringBody（model.getUnit（）.getID（））；
StringBody inventorycatid=新的StringBody（model.getProductposcategory（）.getID（））；
字符串haskolors=“”；
if（model.getHascolortypes（））{
haskolors=“是”；
}
其他的
haskolors=“否”；
StringBody hascolortypes=新的StringBody（hascolors）；
if（infle！=null）{
fis=新文件输入流（infle）；
}
DefaultHttpClient httpclient=新的DefaultHttpClient（新的BasicHttpParams（））；
字符串Posturl=urlobject.Createproducturl（）；
//服务器后端URL
HttpPost HttpPost=新的HttpPost（姿势）；/“http://localhost:56175/api/product/create"
多方实体=新多方实体（）；
//将文件输入流和文件名设置为参数
if（infle！=null）
entity.addPart（“Image”，新的InputStreamBody（fis，infle.getName（））；
实体。添加部分（“名称”，名称）；
实体。添加部件（“条形码”，条形码）；
实体.添加部分（“库存数量”，数量）；
实体。增加部分（“单位成本”，单位成本）；
实体。添加部分（“折扣”，折扣）；
实体。添加部分（“说明”，描述）；
实体。添加部分（“公司ID”，公司ID）；
实体添加部分（“单位ID”，unitid）；
entity.addPart（“Hascolortypes”，Hascolortypes）；
entity.addPart（“InventorycategoryID”，inventorycatid）；
//Gson Gson=新的Gson（）；
/*字符串json=newJSONArray（model.getCostpersizes（））.toString（）；//gson.toJson（model.getCostpersizes（））；
StringBody productprices=新的StringBody（json）；
实体。添加部分（“成本”，产品价格）*/

//这是内部对象的数组。我使用它收集用户的多个选择。因此，我必须将有效负载内的对象数组发送到.net控制器

                //Adding array to the Product post object
               if(model.getCostpersizes() != null ){
                    for(int k=0; k<model.getCostpersizes().size(); k++){
                        Productpricemodel pricemodel = model.getCostpersizes().get(k);                              

                        entity.addPart("Costpersizes[].SN", new StringBody(pricemodel.getSN()));
                        entity.addPart("Costpersizes[].ProductID", new StringBody(pricemodel.getProductID()));
                        entity.addPart("Costpersizes[].AvailableQuantity", new StringBody(pricemodel.getAvailableQuantity()+""));
                         entity.addPart("Costpersizes[].Barcode", new StringBody(pricemodel.getBarcode()));

                             entity.addPart("Costpersizes[].Cost", new StringBody(pricemodel.getCost()+""));
                             entity.addPart("Costpersizes[].Size.ID", new StringBody(pricemodel.getSize().getID())); 
                             entity.addPart("Costpersizes[].Response", new StringBody(pricemodel.getResponse()));
                        }
                    }

                    System.out.println("This is the string reprensentaion of the object that was sent to the server");
                    System.out.println(entity.toString());

        httppost.setEntity(entity);

                    httppost.setHeader("Accept", "application/json");
                    httppost.setHeader("Accept-Encoding", "gzip");

                       if(Main.LicenseToken != null){
                            httppost.setHeader("Authorization",Main.LicenseToken);  //I just added this here
                       }

        // execute the request
        HttpResponse httpResponse = httpclient.execute(httppost);

        int statusCode = httpResponse.getStatusLine().getStatusCode();
        HttpEntity responseEntity = httpResponse.getEntity();

                    /*
        String responseString = EntityUtils.toString(responseEntity, "UTF-8");

        System.out.println("[" + statusCode + "] " + responseString);*/

        if (responseEntity != null) {
                            InputStream inputStream = responseEntity.getContent();
                            Header contentEncoding = httpResponse.getFirstHeader("Content-Encoding");
                            if (contentEncoding != null && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                                inputStream = new GZIPInputStream(inputStream);
                            }

                            String resultString = convertStreamToString(inputStream);

                            System.out.println("output     "+resultString);
                            inputStream.close();
                            return new GsonBuilder().create().fromJson(resultString, objectClass);
                    }            

    } catch (ClientProtocolException e) {
        System.err.println("Unable to make connection");
        e.printStackTrace();
    } catch (IOException e) {
        System.err.println("Unable to read file");
        e.printStackTrace();
    } 
            finally {
        try {
            if (fis != null) fis.close();
        } catch (IOException e) {}
    }

            return null;
}


    private String convertStreamToString(InputStream inputStream) {
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
    StringBuilder stringBuilder = new StringBuilder();
    String line = null;
    try {
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line + "\n");
        }
    } catch (IOException e) {
        System.out.println("first "+e.toString());
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    } finally {
        try {
            inputStream.close();
        } catch (IOException e) {
            System.out.println("second  "+e.toString());
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
    }

    return stringBuilder.toString();
}

//向Product post对象添加数组
if（model.getCostpersizes（）！=null）{
对于（int k=0；k代码是正确的。存在空指针字符串。未从GUI界面传递字符串说明。这导致错误

Costpersizes[]值也更改为Costpersizes[k]。
需要传递一个索引，以便api能够区分数组中的行。
阅读后我不明白。请在代码中添加更多注释，解释预期和非预期行为。@FailingCoder我编辑了代码。如果仍然很复杂，请告诉我。添加了更多注释
  //Adding array to the Product post object
                   if(model.getCostpersizes() != null ){
                        for(int k=0; k<model.getCostpersizes().size(); k++){
                            Productpricemodel pricemodel = model.getCostpersizes().get(k);                              

                            entity.addPart("Costpersizes[].SN", new StringBody(pricemodel.getSN()));
                            entity.addPart("Costpersizes[].ProductID", new StringBody(pricemodel.getProductID()));
                            entity.addPart("Costpersizes[].AvailableQuantity", new StringBody(pricemodel.getAvailableQuantity()+""));
                             entity.addPart("Costpersizes[].Barcode", new StringBody(pricemodel.getBarcode()));
                             entity.addPart("Costpersizes[].Cost", new StringBody(pricemodel.getCost()+""));
                             entity.addPart("Costpersizes[].Size.ID", new StringBody(pricemodel.getSize().getID())); 
                             entity.addPart("Costpersizes[].Response", new StringBody(pricemodel.getResponse()));
                        }
                    }

 public class Product
{ 
    public IFormFile Image { get; set; }

    public OptionSelect Unit { get; set; }

    public string Name { get; set; }

    public string Barcode { get; set; }  //This is code is used to prove originality of the product

    public int StockQuantity { get; set; }

    public double UnitCost { get; set; }

    public int Discountamt { get; set; }

    public string Description { get; set; }

    public int CompanyID { get; set; }

    // public List<OptionSelect> Producttags { get; set; }

    public string Hascolortypes { get; set; }

    public List<Productpricemodel> Costpersizes { get; set; }

    public string InventorycategoryID { get; set; }
}

 public class Productpricemodel
{
    [JsonProperty("sn")]
    public string SN { get; set; }

    [JsonProperty("cost")]
    public float Cost { get; set; }

    [JsonProperty("productID")]
    public string ProductID { get; set; }

    [JsonProperty("size")]
    public OptionSelect Size { get; set; }

    [JsonProperty("availablequantity")]
    public double AvailableQuantity { get; set; }

    [JsonProperty("barcode")]
    public string Barcode { get; set; }

    [JsonProperty("response")]
    public string Response { get; set; }
}

public List<Productpricemodel> Costpersizes { get; set; }