Question

我正在制作一个小页面，我可以跟踪我的工作时间。我的表格看起来像这样：

<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Working Hours</title>
  <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>
  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
  <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>
  <script>
    $(document).ready(function() {
        $("#datepicker").datepicker();
    });
    $(document).ready(function() {
        $("#datepicker2").datepicker();
    });
  </script>
</head>
<body>
    <form action="../dataExchange" method="POST">
        Day Hours:  <input type="text" name="Day_hours"><br>
        Day Minutes:    <input type="text" name="Day_minutes"><br>
        Allday Hours:   <input type="text" name="Allday_hours"><br>
                        <input type="submit" value="submit"><br><br><br>
    </form>
    <form>
         <input id="datepicker" />
    </form>
    <form>
        <input id="datepicker2" />
    </form>
</body>

这里我还有一个javascript，即日历，其中有“从”日期“到”日期。
我与数据库的连接通过一个servlet，如下所示：

package WorkPackage;

import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;

@WebServlet("/dataExchange")
public class dataExchange extends HttpServlet{

    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

    public void init(ServletConfig config) throws ServletException{
        super.init(config);
    }

    public void doPost(HttpServletRequest req, HttpServletResponse res) 
        throws ServletException, IOException{

        String connectionURL = "jdbc:mysql://localhost/NekiWork";
        Connection connection=null;

        res.setContentType("text/html");
        PrintWriter out = res.getWriter();

        String Date = req.getParameter("Date");
        String Name = req.getParameter("Name");
        String Address = req.getParameter("Address");
        String Allday_hours = req.getParameter("Allday_hours");
        String Day_hours = req.getParameter("Day_hours");
        String Day_minutes = req.getParameter("Day_minutes");
        String Km_to_address = req.getParameter("Km_to_address");
        String Time_to_address = req.getParameter("Time_to_address");

        try {

            Class.forName("com.mysql.jdbc.Driver");
            connection = DriverManager.getConnection(connectionURL, "root", ""); 
            String sql = "INSERT INTO Workdata VALUES (?,?, ?, ?, ?, ?, ?, ?)";
            PreparedStatement pst = connection.prepareStatement(sql);
            pst.setString(1, Date);
            pst.setString(2, Name);
            pst.setString(3, Address);
            pst.setString(5, Day_hours);
            pst.setString(6, Day_minutes);
            pst.setString(4, Allday_hours);
            pst.setString(7, Km_to_address);
            pst.setString(8,  Time_to_address);

            pst.executeUpdate();
            pst.close();
        }
        catch(ClassNotFoundException e){

            out.println("Couldn't load database driver: " + e.getMessage());
        }
        catch(SQLException e){
            out.println("SQLException caught: " + e.getMessage());
        }
        catch (Exception e){
            out.println(e);
        }
        finally {

        try {
            if (connection != null) connection.close();
        }
            catch (SQLException ignored){
                out.println(ignored);
            }
        }
    }
}

所以我的问题是，如何获取我的javascript日历以从我的数据库中获取信息？我可以从javascript连接 - ＆gt; servlet - ＆gt; MySQL数据库，还是我必须完全做其他事情？

最诚挚的问候 MADS

Answer 1

通常，您可以使用返回某些内容的servlet。它可以是任何东西：JSON，XML，文本等等。您可以使用AJAX调用servlet并在javascript中处理结果。或者，您可以使用常规HTML <form>元素，如上例所示。

如果不确切知道自己想要什么，就很难更具体。

如果您的意思是上面的例子，那么您不会调用PrintWriter out的任何方法（除非获得例外）。您可能还会考虑内容类型（现在您正在使用text/html），也许JSON可能是更好的选择。

从javascript日历连接到MySQL

1 个答案: