Question

我有以下JSP页面，该页面查看servlet，获取用户名并将其返回到另一个jsp页面（Result.jsp）

<html>
<body>
  <table>
    <form name="setRuns" action="/servlet/setUserRuns" method="POST">
      <tr>
        <td>
          <p>Username:</p>
          <input type="text" placeholder="Enter Username.." name="user">
          <button type="submit" id="myButton">Submit </button>
    </form>
    <br><br>
    </td>
    </tr>
  </table>
</body>

</html>

以下是Result.jsp的代码

<html>

<body>
  <table border="0" cellpadding="3" cellspacing="3" width="100%">
    <form name="setRuns" action="/servlet/setUserRuns" method="POST">
      <thead>
        <tr style="background-color: #79b7e7;">
          <th>UserName</th>
          <th>End Date</th>
          <th>Saving</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>
            <%=session.getAttribute("userName")%>
          </td>
          <td><input type="date" name="EndDate"></td>
          <td><input type="submit" name="save" value="Save"></td>
        </tr>
      </tbody>
    </form>
  </table>
</body>

</html>

以下代码用于servlet：

 public class setUserRuns extends HttpServlet {
static Logger log = Logger.getLogger(OnAccountUsers.class.getName());

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    HttpSession session = request.getSession(true);
    log.debug("doGet");
    // Set response content type
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    // start db connection
    Connection con = SubscribeConnectionFactory.getInstance().getConnection();

    String clientName = request.getParameter("user");

    ResultSet rs = null;
    PreparedStatement stmt = null;
    try {

        String sql = "SELECT * FROM userdatabase.account inner join userdatabase.users on account.user = users.userName where userName = ?";
        stmt = con.prepareStatement(sql);
        stmt.setString(1, clientName); // setting user =?
        rs = stmt.executeQuery(); // execute the query, and get a result set

        boolean entryFound = false;
        // iterate through the java result set      
        while (rs.next()) {
            entryFound = true;

            session.setAttribute("userName", clientName);           
            response.sendRedirect("/jsp/Result.jsp");                               
        }           
    } catch (Exception e) {
        // error
        System.out.println("Error: " + e.getMessage());
    } finally {
        // close result set
        SubscribeConnectionFactory.getInstance().closeResultSetAndStatement(rs, stmt);
        // close connection
        SubscribeConnectionFactory.getInstance().closeConnection(con);
    }
}


public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    doGet(request, response);
}

public void destroy() {
    PooledDataSource.destroyPooledDataSources();
}

}

从servlet重定向页面后，我需要从Result.jsp中的日期持有者中选择一个日期，并在提交“保存”后将其更新到数据库中并更新jsp页面中的日期。无论如何，有没有办法通过相同的doGet做到这一点？这是我第一次使用servlet。任何帮助表示赞赏。谢谢。

使用Servlet将数据从JSP保存到数据库并更新JSP页面

0 个答案: