Java 数据未插入jsp中的数据库，而循环未在程序中执行_Java_Mysql_Jsp

Java 数据未插入jsp中的数据库，而循环未在程序中执行

java mysql jsp

Java 数据未插入jsp中的数据库，而循环未在程序中执行,java,mysql,jsp,Java,Mysql,Jsp,我在数据库中插入数据时遇到了问题，但它并没有进入数据库。页面在第一页的成功页面上重定向所有内容在显示学生的注册号后填充，然后选择缺席或出席，然后提交但不在数据库中存储数据我尝试在控制台屏幕上打印数据，虽然在外部，但在内部它不在。请帮助解决此问题 Attention.jsp <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transit

我在数据库中插入数据时遇到了问题，但它并没有进入数据库。页面在第一页的成功页面上重定向所有内容在显示学生的注册号后填充，然后选择缺席或出席，然后提交但不在数据库中存储数据我尝试在控制台屏幕上打印数据，虽然在外部，但在内部它不在。请帮助解决此问题

Attention.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<%@page language="java" import="java.sql.*"%>
<%@page import="com.connection.*"%>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title>Towards Excellence</title>
    <link rel="stylesheet" href="css/userstyle.css" type="text/css" media="all" />
    <script src="js/droplist.js" type="text/javascript"></script>
</head>
<body>
<!-- Shell -->
<div id="shell">

    <!-- Header -->
    <div id="header">

        <div class="right">
            <p>Welcome <a href="profilef.jsp"><strong><%=session.getAttribute("usertype")%></strong></a></p>
            <p class="small-nav"><a href="index.jsp">view website</a> / <a href="logout.jsp">Logout</a></p>
        </div>
    </div>
    <!-- End Header -->

    <!-- Navigation -->
    <div id="navigation">
        <ul>
            <li><a href="#">Attendance</a>
                <ul>
                    <li><a href="attendance.jsp">Take Attendance</a></li>
                    <li><a href="viewattendancef.jsp">View Attendance</a></li>
                </ul>
            </li>
            <li><a href="#">Profile</a>
                <ul>
                    <li><a href="profilef.jsp">View Profile</a></li>
                    <li><a href="editprofilef.jsp">Edit Profile</a></li>
                </ul>
            </li>
            <li><a href="viewstudent.jsp">View Student</a></li>
            <li><a href="#">Examination</a>
                <ul>
                    <li><a href="examination.jsp">View Examination</a></li>
                    <li><a href="addexam.jsp">Add Exam details</a></li>
                </ul>
            </li>
            <li><a href="#">Schedule</a>
                <ul>
                    <li><a href="circulars.jsp">View Schedule</a></li>
                    <li><a href="addschedule.jsp">Add Schedule</a></li>
                </ul>
            </li>
            <li><a href="sms.jsp">Send SMS</a></li>
        </ul>
    </div>
    <!-- End Navigation -->
    <!-- Content -->
    <div id="content">
     <div>
     <form action="attendance" method="post">
        <table>
            <tr>
            <td>Date:</td>
            <td>
            <input type="date" name="adate" required/>
            </td>
            </tr>
            <tr>
            <td>Branch:</td>
            <td>
            <select name="branch" id="branch" onchange="setSem();">
              <option value="Computer Engineering">Computer</option>
              <option value="Information Technology">Information Technology</option>
              <option value="Mechanical Engineering">Mechanical</option>
              <option value="Civil Engineering">civil</option>
            </select>
            </td>
            </tr><tr>
            <td>Semester:</td>
            <td>
            <select name="semester" id="semester" onchange="setSubject();">
              <option value="">Select Semester</option>
            </select>
            </td>
            </tr><tr>
            <td>Subject:</td>
            <td>
            <select name="subject"  id="subject">
              <option value="">Select Subject</option>
            </select>
            </td>
            </tr>
        </table>
        <input class="submit" type="submit" value="submit" />
     </form>
     </div>
    </div>
    <!-- End Content -->
</div>
<!-- End Shell -->

<!-- Footer -->
<div id="footer">
    Copyright &copy;
    </div>
<!-- End Footer -->
</body>
</html>

attendancedata.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<%@page language="java" import="java.sql.*"%>
<%@page import="com.connection.*"%>
<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title>Towards Excellence</title>
    <link rel="stylesheet" href="css/userstyle.css" type="text/css" media="all" />
    <script src="js/droplist.js" type="text/javascript"></script>
</head>
<body>
<!-- Shell -->
<div id="shell">

    <!-- Header -->
    <div id="header">
        <div class="right">
            <p>Welcome <a href="profilef.jsp"><strong><%=session.getAttribute("usertype")%></strong></a></p>
            <p class="small-nav"><a href="index.jsp">view website</a> / <a href="logout.jsp">Logout</a></p>
        </div>
    </div>
    <!-- End Header -->

    <!-- Navigation -->
    <div id="navigation">
        <ul>
            <li><a href="#">Attendance</a>
                <ul>
                    <li><a href="attendance.jsp">Take Attendance</a></li>
                    <li><a href="viewattendance.jsp">View Attendance</a></li>
                </ul>
            </li>
            <li><a href="#">Profile</a>
                <ul>
                    <li><a href="profilef.jsp">View Profile</a></li>
                    <li><a href="editprofile.jsp">Edit Profile</a></li>
                </ul>
            </li>
            <li><a href="viewstudent.jsp">View Student</a></li>
            <li><a href="#">Examination</a>
                <ul>
                    <li><a href="examination.jsp">View Examination</a></li>
                    <li><a href="addexam.jsp">Add Exam details</a></li>
                </ul>
            </li>
            <li><a href="#">Schedule</a>
                <ul>
                    <li><a href="schedule.jsp">View Schedule</a></li>
                    <li><a href="addschedule.jsp">Add Schedule</a></li>
                </ul>
            </li>
            <li><a href="sms.jsp">Send SMS</a></li>
        </ul>
    </div>
    <!-- End Navigation -->
    <!-- Content -->

      <div id="content">
     <div>
    <form action="AttendanceData" method="post">

     <%
    String semester,branch;
    semester=(String) session.getAttribute("semester");
    branch=(String) session.getAttribute("branch");
    Connection con=null;
    ResultSet rs=null;
    PreparedStatement pst=null;
    int i=0;
    con = connectiondb.condb();
    try{
        if(semester!=null && branch!=null)
        {
            //st=con.createStatement();
            String query= "select s_uid from student_tbl where s_year= '"+ semester +"' and s_branch= '" + branch + "'";
            pst=con.prepareStatement(query);
            //pst.setString(1, semester);
            //pst.setString(2, branch);
            rs=pst.executeQuery(query);
            session.setAttribute("uid", rs);
            %>
            <table>
            <tr>
            <td>Enrollment NO</td>
            <td>Present</td>
            <td>Absent</td>
            </tr>
        <%

        while(rs.next())
        {
            //String uid=rs.getString("s_uid");

            %>
            <tr>
            <td>
            <input type="text" name="<%= rs.getString("s_uid") %>" value="<%= rs.getString("s_uid") %>" readonly />
            </td>
            <td>
            <input type="radio" name="s_status<%=i%>" value="p"/>
            </td>
            <td>
            <input type="radio" name="s_status<%=i%>" value="a"/>       
            </td>
            </tr>
            <% i++;
            }
            %></table> 
            <%
            }
        }
        catch(Exception e)
                {
                    out.println(e);
                }
            %>
        <input class="submit" type="submit" value="submit" />
        </form>
     </div>
    </div>
    <!-- End Content -->
</div>
<!-- End Shell -->

<!-- Footer -->
<div id="footer">
    Copyright &copy;
    </div>
<!-- End Footer -->
</body>
</html>

AttendanceDAO.java

package com.attendance;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.PreparedStatement;

public class AttendanceDAO {
public void storeData(AttendanceGetSet ad){
    try{
        Class.forName("com.mysql.jdbc.Driver");
        Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/sms","root", "root");
        PreparedStatement psmt=con.prepareStatement("insert into attendance_tbl (date, s_branch, s_year, subject, s_status, s_uid ) values(?, ?, ?, ?, ?, ?)");
        psmt.setString(1, ad.getDate());
        psmt.setString(2, ad.getBranch());
        psmt.setString(3, ad.getSemester());
        psmt.setString(4, ad.getSubject());
        psmt.setString(5, ad.getS_status());
        psmt.setString(6, ad.getS_uid());
        psmt.executeUpdate();
        psmt.clearParameters();
        psmt.close();
    }
    catch(SQLException s){}
    catch(ClassNotFoundException nf){}
}
}

AttendanceGetSet.java

package com.attendance;

public class AttendanceGetSet {

        String date;
        String branch;
        String semester;
        String subject;
        String s_uid;
        String s_status;
        public String getDate() {
            return date;
        }
        public void setDate(String date) {
            this.date = date;
        }
        public String getBranch() {
            return branch;
        }
        public void setBranch(String branch) {
            this.branch = branch;
        }
        public String getSemester() {
            return semester;
        }
        public void setSemester(String semester) {
            this.semester = semester;
        }
        public String getSubject() {
            return subject;
        }
        public void setSubject(String subject) {
            this.subject = subject;
        }
        public String getS_uid() {
            return s_uid;
        }
        public void setS_uid(String s_uid) {
            this.s_uid = s_uid;
        }
        public String getS_status() {
            return s_status;
        }
        public void setS_status(String s_status) {
            this.s_status = s_status;
        }
        public AttendanceGetSet(String date, String branch, String semester,
                String subject, String s_uid, String s_status) {
            super();
            this.date = date;
            this.branch = branch;
            this.semester = semester;
            this.subject = subject;
            this.s_uid = s_uid;
            this.s_status = s_status;
        }


    }

太多的代码。请张贴相关代码。问一个具体的问题。你可能想先读一读。仅仅抓住并忽略错误是非常糟糕的风格。请确保至少记录它们，以便您知道什么时候出了问题。所有代码都与此相关。我知道这里的错误在哪里，它的问题在attendancedata.java中

package com.attendance;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.PreparedStatement;

public class AttendanceDAO {
public void storeData(AttendanceGetSet ad){
    try{
        Class.forName("com.mysql.jdbc.Driver");
        Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/sms","root", "root");
        PreparedStatement psmt=con.prepareStatement("insert into attendance_tbl (date, s_branch, s_year, subject, s_status, s_uid ) values(?, ?, ?, ?, ?, ?)");
        psmt.setString(1, ad.getDate());
        psmt.setString(2, ad.getBranch());
        psmt.setString(3, ad.getSemester());
        psmt.setString(4, ad.getSubject());
        psmt.setString(5, ad.getS_status());
        psmt.setString(6, ad.getS_uid());
        psmt.executeUpdate();
        psmt.clearParameters();
        psmt.close();
    }
    catch(SQLException s){}
    catch(ClassNotFoundException nf){}
}
}

package com.attendance;

public class AttendanceGetSet {

        String date;
        String branch;
        String semester;
        String subject;
        String s_uid;
        String s_status;
        public String getDate() {
            return date;
        }
        public void setDate(String date) {
            this.date = date;
        }
        public String getBranch() {
            return branch;
        }
        public void setBranch(String branch) {
            this.branch = branch;
        }
        public String getSemester() {
            return semester;
        }
        public void setSemester(String semester) {
            this.semester = semester;
        }
        public String getSubject() {
            return subject;
        }
        public void setSubject(String subject) {
            this.subject = subject;
        }
        public String getS_uid() {
            return s_uid;
        }
        public void setS_uid(String s_uid) {
            this.s_uid = s_uid;
        }
        public String getS_status() {
            return s_status;
        }
        public void setS_status(String s_status) {
            this.s_status = s_status;
        }
        public AttendanceGetSet(String date, String branch, String semester,
                String subject, String s_uid, String s_status) {
            super();
            this.date = date;
            this.branch = branch;
            this.semester = semester;
            this.subject = subject;
            this.s_uid = s_uid;
            this.s_status = s_status;
        }


    }