<% //连接数据库 String driver = "com.mysql.jdbc.Driver"; String url = "jdbc:mysql://localhost:3306/votedb?serverTimezone=UTC&characterEncoding=UTF-8"; String username = "root"; String password = "123456"; Connection conn = null; Statement stmt = null; ResultSet rs = null; try { Class.forName(driver); conn = DriverManager.getConnection(url, username, password); stmt = conn.createStatement(); rs = stmt.executeQuery("SELECT * FROM vote"); while(rs.next()){ String title = rs.getString("title"); %> <input type="radio" name="option" value="<%=title%>"><%=title%><br> <% } } catch (Exception e) { e.printStackTrace(); } finally { //关闭连接 try { if (rs != null) { rs.close(); } if (stmt != null) { stmt.close(); } if (conn != null) { conn.close(); } } catch (SQLException e) { e.printStackTrace(); } } %> <a href="showVote.jsp">提交投票</a>选中后数据库数据变化

根据您的代码，您想要实现的功能是：在页面上展示投票选项列表（从数据库中查询出来），用户在选中一个选项后，点击“提交投票”按钮，将投票结果存储到数据库中。

您想要实现的选中后数据库数据变化，可能是指将用户的投票结果存储到数据库中。在提交投票的页面中，您可以编写一个表单，其中包含一个隐藏的投票ID字段和一个单选框选项，用户选中后提交表单。后台代码根据投票ID和选中的选项，将投票结果存储到数据库中。

这里提供一个简单的代码示例：

1. 提交投票页面（submitVote.jsp）：

<form action="voteHandler.jsp" method="post">
  <%  // 根据你的数据库结构修改以下代码
      String driver = "com.mysql.jdbc.Driver";
      String url = "jdbc:mysql://localhost:3306/votedb?serverTimezone=UTC&characterEncoding=UTF-8";
      String username = "root";
      String password = "123456";
      Connection conn = null;
      Statement stmt = null;
      ResultSet rs = null;
      try {
          Class.forName(driver);
          conn = DriverManager.getConnection(url, username, password);
          stmt = conn.createStatement();
          rs = stmt.executeQuery("SELECT * FROM vote");
          while(rs.next()){
              int id = rs.getInt("id");
              String title = rs.getString("title");
  %>
  <input type="radio" name="option" value="<%=id%>"><%=title%><br>
  <%    }
      } catch (Exception e) {
          e.printStackTrace();
      }
      finally {
          //关闭连接
          try {
              if (rs != null) {
                  rs.close();
              }
              if (stmt != null) {
                  stmt.close();
              }
              if (conn != null) {
                  conn.close();
              }
          } catch (SQLException e) {
              e.printStackTrace();
          }
      }
  %>
  <input type="hidden" name="voteId" value="<%=voteId%>">
  <input type="submit" value="提交投票">
</form>

2. 处理投票请求（voteHandler.jsp）：

<%  // 获取用户选择的选项和投票ID
    String option = request.getParameter("option");
    String voteId = request.getParameter("voteId");
    // 根据你的数据库结构修改以下代码
    String driver = "com.mysql.jdbc.Driver";
    String url = "jdbc:mysql://localhost:3306/votedb?serverTimezone=UTC&characterEncoding=UTF-8";
    String username = "root";
    String password = "123456";
    Connection conn = null;
    PreparedStatement pstmt = null;
    try {
        Class.forName(driver);
        conn = DriverManager.getConnection(url, username, password);
        pstmt = conn.prepareStatement("INSERT INTO vote_result(vote_id, option_id) VALUES (?, ?)");
        pstmt.setInt(1, Integer.parseInt(voteId));
        pstmt.setInt(2, Integer.parseInt(option));
        pstmt.executeUpdate();
    } catch (Exception e) {
        e.printStackTrace();
    }
    finally {
        //关闭连接
        try {
            if (pstmt != null) {
                pstmt.close();
            }
            if (conn != null) {
                conn.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    response.sendRedirect("voteResult.jsp?voteId=" + voteId); // 投票成功后跳转到投票结果页面
%>

3. 投票结果页面（voteResult.jsp）：

<%  // 获取投票ID并查询投票选项和结果
    String voteId = request.getParameter("voteId");
    // 根据你的数据库结构修改以下代码
    String driver = "com.mysql.jdbc.Driver";
    String url = "jdbc:mysql://localhost:3306/votedb?serverTimezone=UTC&characterEncoding=UTF-8";
    String username = "root";
    String password = "123456";
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;
    try {
        Class.forName(driver);
        conn = DriverManager.getConnection(url, username, password);
        stmt = conn.createStatement();
        rs = stmt.executeQuery("SELECT v.title, o.title AS option_title, COUNT(*) AS vote_count FROM vote v LEFT JOIN vote_option o ON v.id = o.vote_id LEFT JOIN vote_result r ON o.id = r.option_id WHERE v.id = " + voteId + " GROUP BY o.id");
        while(rs.next()){
            String title = rs.getString("title");
            String optionTitle = rs.getString("option_title");
            int voteCount = rs.getInt("vote_count");
%>
<p><%=optionTitle %>： <%=voteCount %> 票</p>
<%
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    finally {
        //关闭连接
        try {
            if (rs != null) {
                rs.close();
            }
            if (stmt != null) {
                stmt.close();
            }
            if (conn != null) {
                conn.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
%>

希望这个示例能够帮助您完成您的需求。