当我从表单提交数据时，它不会保存到数据库中...没有发生错误...
我可以从数据库中检索但不能保存到它...
继承人的代码：
测试.jsp
<%@page import="java.util.ArrayList"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page import="java.util.*" %>
<%@ page import="my.beans.StudentBean"%>
<jsp:useBean id="studentData" scope="request"
class="my.beans.StudentDataBean"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Words View</title>
<style type="text/css">
table, tr, td, th
{
text-algn: center;
font-size: .9em;
border: 3px groove;
padding: 3px;
background-color: #eee9e9;
}
</style>
</head>
<body>
<h1>Student List</h1>
<table border="1">
<tr>
<th>
<h4>First Name</h4>
</th>
<th>
<h4>Last Name</h4>
</th>
<th>
<h4>Comment</h4>
</th>
<th>
<h4>Email</h4>
</th>
</tr>
<%
ArrayList<StudentBean> studentList = studentData.getStudentList();
Iterator studentListIterator = studentList.iterator();
StudentBean student;
while (studentListIterator.hasNext()){
student = (StudentBean) studentListIterator.next();
%>
<tr>
<td><%= student.getFirstName()%></td>
<td><%= student.getLastName()%></td>
<td><%= student.getComment()%></td>
<td><%= student.getEmail()%></td>
</tr>
<% }
%>
</table>
</body>
</html>
formTest.jsp
<%@taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<jsp:useBean id = "student" scope = "page"
class = "my.beans.StudentBean" />
<jsp:useBean id = "studentD" scope = "page"
class = "my.beans.StudentDataBean" />
<html>
<form method="post" action="test.jsp">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Student Login</title>
</head>
<body>
<jsp:setProperty name = "student" property = "*" />
<% // start scriptlet
if (student.getFirstName() == null
|| student.getLastName() == null
|| student.getEmail() == null
|| student.getComment() == null) {
%>
Enter forename, surname, student ID and email address to <br />
register.<br />
<br />
<table border="1">
<tr>
<td>First Name:</td>
<td>
<input type="text" name="first" />
</td>
</tr>
<tr>
<td>Last Name:</td>
<td>
<input type="text" name="last" />
</td>
</tr>
<tr>
<td>Email:</td>
<td>
<input type="text" name="email" />
</td>
</tr>
<tr>
<td>Comment:</td>
<td>
<input type="text" name="comment" />
</td>
</tr>
<tr>
<td>
<input type="submit" value="Submit" />
</td>
</tr>
</table>
</body>
</form>
<% } else {
studentD.addStudent(student);
%>
<jsp:forward page="test.jsp" />
<%
}
%>
</html>
然后我的豆子...
StudentBean.java
package my.beans;
public class StudentBean {
/***********\
* Globals *
\***********/
private String firstName;
private String lastName;
private String comment;
private String email;
public StudentBean(){
}
// get/set for First Name
public void setFirstName(String f) {
firstName = f;
}
public String getFirstName(){
return firstName;
}
// get/set for Last Name
public void setLastName(String l) {
lastName = l;
}
public String getLastName(){
return lastName;
}
// get/set for comment
public void setComment(String co) {
comment = co;
}
public String getComment(){
return comment;
}
// get/set for Email
public void setEmail(String em) {
email = em;
}
public String getEmail(){
return email;
}
}
StudentDataBean.java
package my.beans;
import java.sql.SQLException;
import javax.sql.rowset.CachedRowSet;
import java.util.ArrayList;
import com.sun.rowset.CachedRowSetImpl; // CachedRowSet implementation
public class StudentDataBean {
private CachedRowSet rowSet;
// construct TitlesBean object
public StudentDataBean() throws ClassNotFoundException, SQLException{
// load the MySQL driver
Class.forName("com.mysql.jdbc.Driver");
// specify properties of CachedRowSet
rowSet = new CachedRowSetImpl();
rowSet.setUrl("jdbc:mysql://localhost:3306/test");
rowSet.setUsername("root");
rowSet.setPassword("");
// obtain list of titles
rowSet.setCommand("SELECT firstName, lastName, email, comment FROM guests" );
rowSet.execute();
} // end StudentDataBean constructor
// return an ArrayList of StudnetBeans
public ArrayList<StudentBean> getStudentList() throws SQLException{
ArrayList<StudentBean> studentList = new ArrayList<StudentBean>();
rowSet.beforeFirst(); // move cursor before the first row
// get row data
while (rowSet.next()){
StudentBean student = new StudentBean();
student.setFirstName(rowSet.getString(1));
student.setLastName(rowSet.getString(2));
student.setEmail(rowSet.getString(3));
student.setComment(rowSet.getString(4));
studentList.add( student );
} // end while
return studentList;
} // end method getStudentList
// insert a Student in student database
public void addStudent(StudentBean student) throws SQLException
{
rowSet.moveToInsertRow(); // move cursor to the insert row
// update the three columns of the insert row
rowSet.updateString( 1, student.getFirstName() );
rowSet.updateString( 2, student.getLastName() );
rowSet.updateString( 3, student.getEmail() );
rowSet.updateString( 4, student.getComment() );
rowSet.insertRow(); // insert row to rowSet
rowSet.moveToCurrentRow(); // move cursor to the current row
try{
rowSet.acceptChanges();
}
catch(Exception e){
System.out.println("Exception caught at line 67: " + e);
}
}
}