使用JSON对象作为数据的HTTP POST请求

我正在努力用JSON对象作为数据发出HTTP POST请求。

I am struggling to make an HTTP POST request with JSON object as data.

如下所示，首先我创建了一个HTTP Post请求。然后我注释掉了它的一部分并尝试修改它以添加与JSON相关的代码。令我感到困惑的一件事是，尽管看到许多使用导入org.json.simple.JSONObject的教程，但我的IDE会读取错误消息并指出导入org.json.simple.JSONObject无法解析。

As you can see below, first I created an HTTP Post request. Then I commented out part of it and attempted to modify it in order to add JSON related code. One of the things that confused me was that despite seeing a number of tutorials using the import "org.json.simple.JSONObject" my IDE reads an error message and states "the import org.json.simple.JSONObject cannot be resolved".

有关如何使此代码正常工作的任何建议都将不胜感激。

Any advice about how to make this code work would be much appreciated.

 import java.io.*;
 import java.net.*;
 import org.json.simple.JSONObject;

 public class HTTPPostRequestWithSocket {

    public void sendRequest(){

        try {

            JSONObject obj = new JSONObject();
            obj.put("instructorName", "Smith");
            obj.put("courseName", "Biology 101");
            obj.put("studentName1", "John Doe");
            obj.put("studentNumber", new Integer(100));
            obj.put("assignment1", "Test 1");
            obj.put("gradeAssignment1", new Double("95.3"));

           /*
           //Note that this code was taken out in order to attempt to send
           //the information in the form of JSON.
           String params = URLEncoder.encode("param1", "UTF-8")
                + "=" + URLEncoder.encode("value1", "UTF-8");
            params += "&" + URLEncoder.encode("param2", "UTF-8")
                + "=" + URLEncoder.encode("value2", "UTF-8");
             */

            String hostname = "nameofthewebsite.com";
            int port = 80;

            InetAddress addr = InetAddress.getByName(hostname);
            Socket socket = new Socket(addr, port);
            String path = "/nameofapp";

            // Send headers
            BufferedWriter wr = new BufferedWriter(new     
            OutputStreamWriter(socket.getOutputStream(), "UTF8"));
            wr.write("POST "+path+" HTTP/1.0rn");
            wr.write("Content-Length: "+obj.length()+"rn");
            wr.write("Content-Type: application/x-www-form-urlencodedrn");
            wr.write("rn");

            // Send parameters
            wr.write(obj);
            wr.flush();

            // Get response
            BufferedReader rd = new BufferedReader(new   InputStreamReader(socket.getInputStream()));
             String line;

            while ((line = rd.readLine()) != null) {
                System.out.println(line);
                }

            wr.close();
            rd.close();
            socket.close();//Should this be closed at this point?
            }catch (Exception e) {e.printStackTrace();}
        }
}