错误JSP

Question

关于复选框计数，我有一个错误。我的数据旁边有一个复选框。例如，我勾选了2个复选框，然后按Delete键。它将始终显示为0。如何解决此错误？我尝试了几种方法来解决此问题，但我的计数始终显示为0。

This is a picture of the message display

 String[] id = request.getParameterValues("deletechkbox");
        int count=0;
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            // Step 2: Define Connection URL
            String connURL = "jdbc:mysql://localhost/medicloud?user=root&password=root";
            // Step 3: Establish connection to URL
            conn = DriverManager.getConnection(connURL);

            if (id != null)
            {

        for(int i=0; i<id.length; i++){

        String sqlStr = "DELETE from exercise1 where id=?";
        PreparedStatement pstmt = conn.prepareStatement(sqlStr);
        pstmt.setInt(1, Integer.parseInt(id[i]));
        int rec = pstmt.executeUpdate();
        if (rec==1)
            count++;
        }
        }

这是我的复选框设置。

<td style="width: 5%"><input class="mychkbox" type="checkbox"
value="<%=id%>" form="multipleDele" name="deletechkbox" /></td> 

这是我的复选框表格

<form action="delete.jsp" id="multipleDele" method="post">
<strong>Selected Exercise(s) to: </strong><input type="submit"
value="Delete" id="mulDelBtn" name="deleteMultipleBtn" />
</form>