如何在Java中通过HTTP发布JSON数据？

我是JSON新手，正在开发Coinbase API

所以我试图通过HTTP发布这些数据：

{
  "transaction": {
    "to": "user1@example.com",
    "amount": "1.234",
    "notes": "Sample transaction for you"
  }
}

在Java中如何实现这一点

我知道如何创建程序以获得响应，但不知道如何发布请求

以下是我的回应计划：

如何创建类似于Post请求的程序？

试试这个

String url = "http://yoururl.com";
URL obj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

//add reuqest header
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", USER_AGENT);
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

String urlParameters = "sn=C02G8416DRJM&cn=&locale=&caller=&num=12345";

// Send post request
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();

int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + urlParameters);
System.out.println("Response Code : " + responseCode);

BufferedReader in = new BufferedReader(
        new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
    response.append(inputLine);
}
in.close();

//print result
System.out.println(response.toString());

---

你自己试过了吗。。我试过了。。但总是被卡住！！：这就是为什么我来这里问……：请帮忙！解释问题，你得到了什么？错误？请求未发送，是否为空。。。参数是一个名称-值对，您将在其中发送json。程序中的用户代理是什么？？。这给了我一个错误。。未定义。将整行替换为con.setRequestPropertyUser-Agent，Mozilla/5.1；检查服务器端代码。并检查您是否发布到有效的url。

String url = "http://yoururl.com";
URL obj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

//add reuqest header
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", USER_AGENT);
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

String urlParameters = "sn=C02G8416DRJM&cn=&locale=&caller=&num=12345";

// Send post request
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();

int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + urlParameters);
System.out.println("Response Code : " + responseCode);

BufferedReader in = new BufferedReader(
        new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();

while ((inputLine = in.readLine()) != null) {
    response.append(inputLine);
}
in.close();

//print result
System.out.println(response.toString());