Question

我有这样的表 -

fnumber|fstatus|department|date&time
 f1      out       d1         a
 f2      out       d2         b
 f1      in        d3         c
 f1      out       d3         d
 f2      in        d1         e
 f1      in        d1         f
 f2      out       d1         g
 f2      in        d2         h

有没有一种方法可以让同一个fnumber自动组合在一起并根据日期和时间（从旧到新）排列 -

   fnumber|fstatus|department|date&time
  f1      out       d1         a
  f1      in        d3         c
  f1      out       d3         d
  f1      in        d1         f
  f2      out       d2         b
  f2      in        d1         e     
  f2      out       d1         g
  f2      in        d2         h

现在我正在使用servlet和jsp来简单地插入值，但我希望它们像上面一样排列（假设我插入f1然后f2然后f3现在如果f1再次插入我希望它插入f1和f2之间不是在f3之后。在某种程度上我能做到这一点。

fileStatus.jsp这是用户提交值的文件。

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import ="java.sql.*" %>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>File Status Page</title>
     <style>
header {
background-color:teal;
color:white;
text-align:center;
padding:30px;
}

section {
width:350px;
float:left;
padding:150px;
}
footer {
background-color:black;
color:white;
clear:both;
text-align:center;
padding:5px;
}
</style>
</head>
<body style="background-color:lightsteelblue;">
     <%
String userName = null;
String sessionID = null;
Cookie[] cookies = request.getCookies();
if(cookies !=null){
for(Cookie cookie : cookies){
if(cookie.getName().equals("admin")) userName = cookie.getValue();
}
} 
%>
<header>
<h3>Hi <%=userName %></h3>
</header>
<a href="create.jsp"><font color="black">back</font></a>
<form action=" LogoutServlet" method="post">
<input type="submit" value="Logout" >
</form>
<section>
<h3>Change Status</h3>
<form action="statusServlet" method="post">
<table>
    <tbody>
        <tr>
            <td>
    File Number :<select name="files">
                <%
    try{
String sql="select * from files";
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/login",
        "root", "root");
Statement st = con.createStatement();
ResultSet rs=st.executeQuery(sql);
while(rs.next()){
%>                          
  <option value="<%=rs.getString("fileno")%>"><%=rs.getString("fileno")%></option>
<%}
rs.close();
st.close();
con.close();
}catch(Exception e){
e.printStackTrace();
}
%> 
        </select></td>
        </tr>
        <tr>
            <td>  
File Department :<select name="departments">
            <%
    try{
String sql="select * from department";
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/login",
        "root", "root");
Statement st = con.createStatement();
ResultSet rs=st.executeQuery(sql);
while(rs.next()){
%>                          
  <option value="<%=rs.getString("departmentname")%>"><%=rs.getString("departmentname")%></option>
<%}
rs.close();
st.close();
con.close();
}catch(Exception e){
e.printStackTrace();
}
%>
    </select></td>
        </tr>
        <tr> 
            <td>
    File Status :<select name="input">
            <option>IN</option>
            <option>OUT</option>
        </select></td>
        </tr>
        <tr>
            <td>
                <input type="submit" value="submit" name="submit" />
            </td>
        </tr>

</tbody>
</table>
    </form>
</section>
<footer>
Copyright example. All right reserved.                             
</footer>
</body>
</html>

stausServlet.java在此我使用sql查询来插入数据。

package bean;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.PreparedStatement;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class statusServlet extends HttpServlet {

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
     Cookie[] cookies = request.getCookies();
    if(cookies != null){
    for(Cookie cookie : cookies){
        if(cookie.getName().equals("JSESSIONID")){
            System.out.println("JSESSIONID="+cookie.getValue());
            break;
        }
    }
    }       
    HttpSession session = request.getSession(false);
    System.out.println("admin="+session.getAttribute("admin"));
   if(session!=null && session.getAttribute("admin") != null){
                String user=(String)session.getAttribute("admin"); 
                boolean status=false;
    try{
        String fno=request.getParameter("files");
        String departments=request.getParameter("departments");
        String input=request.getParameter("input");

        Connection con=ConnectionProvider.getCon();

        String sql="insert into status(fnumber,fstatus,department) values (?,?,?)";
        PreparedStatement pstmt =con.prepareStatement(sql);

        pstmt.setString(1,fno); 
        pstmt.setString(2,input);
        pstmt.setString(3,departments);

        int rs=pstmt.executeUpdate();
        if(rs>0){status=true;}

    }catch(Exception e){}
              if(status){
                response.sendRedirect("fileStatus.jsp");
                PrintWriter out= response.getWriter();
                out.println("Values have been inserted,"+user);
                //out.flush();
                }
              else 
              {
                  PrintWriter out= response.getWriter();
                  out.println("failed");
                  response.sendRedirect("create.jsp");
              } 

              }else{
    RequestDispatcher rd = getServletContext().getRequestDispatcher("/index.html");
    PrintWriter out= response.getWriter();
    out.println("<font color=red>Either user name or password is wrong.</font>");
    rd.include(request, response);
    }

}

}

Answer 1

如果您使用sql获取数据，则应使用Order By子句。

如果您使用的是Java列表，则可以使用Comparator对列表进行排序，例如参见https://stackoverflow.com/a/18441978/3543153

将具有相同名称的行放在一起

1 个答案: