从Java应用程序发布表单(在JMX控制台上)

This 我正在尝试实现,但是使用Java代码。表格如下:

<form method="post" action="HtmlAdaptor">
  <input type="hidden" name="action" value="invokeOp">
  <input type="hidden" name="name" value="dcm4chee.archive:service=ContentEditService">
  <input type="hidden" name="methodIndex" value="29">
  <hr align='left' width='80'>
  <h4>void purgeStudy()</h4>
  <p>Purge study. (Files will be removed from FilesystemMgt service see</p>

  <table cellspacing="2" cellpadding="2" border="1">
    <tr class="OperationHeader">
      <th>Param</th>
      <th>ParamType</th>
      <th>ParamValue</th>
      <th>ParamDescription</th>
    </tr>

    <tr>
      <td>iuid</td>
      <td>java.lang.String</td>
      <td>

        <input type="text" name="arg0">

      </td>
      <td>Study Instance UID.</td>
    </tr>

  </table>

  <input type="submit" value="Invoke">
</form>

我写的程序:

// the URL of the configuration page on the JMX Console
URL url = new URL("http://localhost:8080/jmx-console/"
    + "HtmlAdaptor?action=inspectMBean&name="
    + "dcm4chee.archive%3Aservice%3DContentEditService");

// the login information
String userpassEnc = Base64.getEncoder().encodeToString(("admin:admin")
    .getBytes(StandardCharsets.UTF_8));

// the data to be sent
String params
    = "action=invokeOp&name=dcm4chee.archive%3Aservice%3DContentEditService"
    + "&methodIndex=29&arg0=123456&submit=Invoke";
byte[] postData = params.getBytes(StandardCharsets.UTF_8);

// Configuring the connection...
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestProperty("Authorization", "Basic " + userpassEnc);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("charset", "utf-8");
conn.setRequestProperty("Content-Length", Integer.toString(postData.length));
conn.setConnectTimeout(5000);
conn.setDoOutput(true);
conn.setInstanceFollowRedirects(true);

// Sending the data...
DataOutputStream out = new DataOutputStream(conn.getOutputStream());
out.write(postData);

// Receiving the response...
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while (in.readLine() != null) { System.out.println(in.readLine()); }

结果是:

登录成功,但由于未发布表单,因此未调用mbean方法。作为回应,我只得到网页的html源代码,它有我想发布的表单。(从Web浏览器发布表单时,将打开一个页面,告诉我调用的操作是否成功。我希望该页的源代码是一个响应。)