Java JSP从MySQL删除行

我使用MySQL在JSP中生成了一个人员列表，问题是如何删除他们。这是我的代码：

JSP:

最后，这是我的控制器代码：

    public boolean rejectApplicant(int applicantID) {
    try {
        DBConnectionFactory myFactory = DBConnectionFactory.getInstance();
        Connection conn = myFactory.getConnection();

        String query = "delete from applicant where applicantID = ?";

        PreparedStatement pstmt = conn.prepareStatement(query);
        pstmt.setInt(1, applicantID);

        int rows = pstmt.executeUpdate();
        conn.close();
        pstmt.close();
        return true;
    } catch (SQLException ex) {
        Logger.getLogger(ApplicantDAO.class.getName()).log(Level.SEVERE, null, ex);
    }
    return false;
}

---

你能指导我怎么做事吗？非常感谢你

您的问题就在这部分代码中

     <form action="deleteApplicant" action="post">
   <button type="button" class="btn btn-default delete" aria-label="Left Align" id="accept<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>">
  <span class="glyphicon glyphicon-ok" aria-hidden="true"></span>
  </button>
    </form>
    <form>
   <button type="button" class="btn btn-default delete" aria-label="Left Align" id="reject<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>">
    <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
 </button>
 </form>

你应该知道你放的第二张表格

<form>
   <button type="button" class="btn btn-default delete" aria-label="Left Align" id="reject<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>">
    <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
 </button>
 </form>

简单通过

 boolean successful = applicantDAO.rejectApplicant(id);

---

错误消息是什么？没有。它在allString query=delete from applicator（其中applicationId=？）处未显示任何错误？；setInt在哪里？请检查编辑的代码我放了两个表格，因为第一个表格用于接受，另一个用于删除。你怎么做隐藏的输入？谢谢你，所以你应该把你的servlet放在第二种形式，我把它添加到你的代码中。是的，你把delete servlet放在接受部分，这是你的第一个问题。它仍然是一样的。在你这么说之前，我已经更改了它，它实际上没有显示错误消息。第二个问题是，你放置了一个input type=按钮，你应该将它更改为type=submit。我的答案是经过编辑的

 <form action="deleteApplicant" action="post">
<input type="hidden" name="ID" value="<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>"/>

       <button type="submit" class="btn btn-default delete" aria-label="Left Align" id="accept<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>">
      <span class="glyphicon glyphicon-ok" aria-hidden="true"></span>
      </button>
        </form>

String value = request.getParameter("ID");

<form>
   <button type="button" class="btn btn-default delete" aria-label="Left Align" id="reject<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>">
    <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
 </button>
 </form>

<form action="deleteApplicant" action="post">
    <input type="hidden" name="ID" value="<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>"/>
       <button type="submit" class="btn btn-default delete" aria-label="Left Align" id="reject<%=applicantDAO.viewApplicant().get(i).getApplicantID()%>">
        <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
     </button>
     </form>

boolean successful = applicantDAO.rejectApplicant(deletedApplicant.getApplicantID());

 boolean successful = applicantDAO.rejectApplicant(id);