자바 http 통신

HttpURLConnection con;
 String url;
 HttpReq() {
 }
 HttpReq(String url) throws IOException {
  this.url = url;
  URL myurl = new URL(url);
  con = (HttpURLConnection) myurl.openConnection();
 }
 void closeServer() {
  con.disconnect();
 }
 public StringBuilder get() throws IOException {
  StringBuilder content;
  con.setRequestMethod("GET");
  try (BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
   String line;
   content = new StringBuilder();
   while ((line = in.readLine()) != null) {
    content.append(line);
    content.append(System.lineSeparator());
   }
  }
  System.out.println(content.toString());
  return content;
 }
 public StringBuilder post() throws IOException {
  String urlParameters = "name=Jack&occupation=programmer";
  StringBuilder content;
  byte[] postData = urlParameters.getBytes(StandardCharsets.UTF_8);
  con.setDoOutput(true);
  con.setRequestMethod("POST");
  con.setRequestProperty("User-Agent", "Java client");
  con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
  try (DataOutputStream wr = new DataOutputStream(con.getOutputStream())) {
   wr.write(postData);
  }
  try (BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
   String line;
   content = new StringBuilder();
   while ((line = in.readLine()) != null) {
    content.append(line);
    content.append(System.lineSeparator());
   }
  }
  System.out.println(content.toString());
  return content;
 }