從Java中的CurlPost請求中獲取Json/Resonse正文

這是我撰寫的發送 POST 請求以發送電子郵件的方法。我能夠發送電子郵件并獲得回應代碼 200 Ok。但我不知道如何獲取 JSON 回應并將其轉換為物件。有人可以告訴我該怎么做嗎？

public void sendEmail() {
        try {
            URL url = new URL("https://mandrillapp.com/api/1.0/messages/send");

            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setRequestProperty("Content-Type", "application/json");

            String data =
                    "{\"key\": \""   mailchimpApiKey   "\", "  
                            "\"message\": {"  
                            "\"from_email\": \"[email protected]\", "  
                            "\"subject\": \"Hello World\", "  
                            "\"text\": \"Welcome to Mailchimp Transactional!\", "  
                            "\"to\": [{ \"email\": \"[email protected]\", \"type\": \"to\" }]}}";

            byte[] out = data.getBytes(StandardCharsets.UTF_8);

            OutputStream stream = httpURLConnection.getOutputStream();
            stream.write(out);

            System.out.println(httpURLConnection.getResponseCode()   " "   httpURLConnection.getResponseMessage());

            httpURLConnection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

uj5u.com熱心網友回復：

基本搜索顯示：https ://www.baeldung.com/httpurlconnection-post#8-read-the-response-from-input-stream

try(BufferedReader br = new BufferedReader(
  new InputStreamReader(con.getInputStream(), "utf-8"))) {
    StringBuilder response = new StringBuilder();
    String responseLine = null;
    while ((responseLine = br.readLine()) != null) {
        response.append(responseLine.trim());
    }
    System.out.println(response.toString());
}

如果回應是 JSON 格式，請使用任何第三方 JSON 決議器，例如 Jackson 庫、Gs??on 或 org.json 來決議回應。

uj5u.com熱心網友回復：

您可以獲取errorStream或inputStream基于response code您收到的資訊并從中獲取回應。下面的示例BufferedReader從流中創建一個

BufferedReader br = null;
if (100 <= httpURLConnection.getResponseCode() && httpURLConnection.getResponseCode() <= 399) {
    br = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
} else {
    br = new BufferedReader(new InputStreamReader(httpURLConnection.getErrorStream()));
}

br然后，您可以根據您的要求讀取和存盤資料。下面將資料存盤到StringBuilder

StringBuilder data = new StringBuilder();
    String dataLine = null;
    while ((dataLine = br.readLine()) != null) {
        data.append(dataLine.trim());
    }
    System.out.println(data.toString());

除了列印，String 您還可以JSON使用JSON庫將其轉換為。您可以按照本指南

uj5u.com熱心網友回復：

除了@mdre 的回答

我使用org.json庫將回應轉換為 JSON 物件。以下方法正是這樣做的：

import org.json.JSONException;
import org.json.JSONObject;

    public static JSONObject convertResponseToJSONObject(String responseString) {
        try {
            JSONObject jsonObj = new JSONObject(responseString);
            return jsonObj;
        } catch (JSONException e) {
            System.err.println(
                "It is not possible to create a JSONObject from the input string, returning null. Exception:");
            e.printStackTrace();
        }
        return null;
    }

請注意，回應僅表示以 . 開頭的 JSON 物件{。如果它以 a 開頭，[則回應表示一個 JSON 陣列。

標籤：爪哇 json 卷曲

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