使用POST Java傳遞數組

Question

我會直截了當。 我正在嘗試使用需要通過數組的API，這樣您就可以在單個API調用中通過多個對象。 每當我嘗試執行此操作時，我都會收到400個錯誤。

不能100％知道我是否做對了，嘗試了很多研究，但找不到任何遇到相同問題的人。 對不起所有文本，但它應該使所有內容更直接。 任何幫助將不勝感激，謝謝。

首先，這是數組的外觀：

{
   "listings":[
      {
         "intent":0,
         "item": {
               "quality": 6,
               "item_name": "Name",
               "craf": 1,
               "priceindex":"currency"
                 },
         "currencies":{
            "m":1
                      },
         "details":"Test",
         "BO":1,
         "offers":1,
         "promoted":0
      }
   ]
}

這是我嘗試制作數組的方法：

    JSONObject listing = new JSONObject();
    JSONObject itemObject = new JSONObject();
    JSONObject itemDetails = new JSONObject();
    JSONObject currency = new JSONObject();

    itemObject.put("intent", intent);

    itemDetails.put("quality", quality);
    itemDetails.put("item_name", item_name);
    itemDetails.put("craf", craftable);
    itemDetails.put("princeindex", princeindex);

    itemObject.put("item", itemDetails);

    currency.put("m", currencies);

    itemObject.put("details", "Test");
    itemObject.put("BO", buyout);
    itemObject.put("offers", offers);
    itemObject.put("promoted", promoted);
    itemObject.put("currencies", currency);

    listing.put("listings", itemObject);

    Set(listing);

POST調用的實際代碼在這里：

URL url = new URL("https://backpack.tf/api/classifieds/list/v1");
        Map<String, Object> params = new LinkedHashMap<>();
        params.put("token","#########");
        params.put("listings", this.listings);

        StringBuilder postData = new StringBuilder();
        for (Map.Entry<String, Object> param : params.entrySet()) {
            if (postData.length() != 0)
                postData.append('&');
            postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));
            postData.append('=');
            postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));
        }
        byte[] postDataBytes = postData.toString().getBytes("UTF-8");

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestProperty("User-Agent", "Mozilla/5.0");
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length));
        conn.setDoOutput(true);
        conn.getOutputStream().write(postDataBytes);

編輯（400錯誤）：

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 400 for URL: https://backpack.tf/api/classifieds/list/v1?token=5863418ee3387722bc77bcc0
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
    at Scraper.APIFinalBOT.set(APIFinalBOT.java:48)
    at Scraper.nodeJSBotPricer.Set(nodeJSBotPricer.java:97)
    at Scraper.nodeJSBotPricer.main(nodeJSBotPricer.java:82)
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: https://backpack.tf/api/classifieds/list/v1?token=5863418ee3387722bc77bcc0
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at java.net.HttpURLConnection.getResponseCode(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)
    at Scraper.APIFinalBOT.set(APIFinalBOT.java:43)
    ... 2 more

Answer 1

該網址幾乎是正確的。

你在打電話

 https://backpack.tf/api/classifieds/list/v1/

當記錄的API端點不帶有斜杠時。

 https://backpack.tf/api/classifieds/list/v1

在瀏覽器中對其進行測試，如預期的那樣，我得到一個帶有斜杠的URL 404，並且在刪除斜杠時出現“請使用POST”錯誤。