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我想創建一個使用jsp，beans和servlets的註冊系統。註冊過程似乎沒問題，但每次數據都應該存儲到數據庫中，行只填充NULL。我是這個學科的新手，所以我真的會讚賞你的幫助！ 下面是這個 「系統」 的代碼：基於JSP與MySQL連接的註冊系統 - null在db
ragister.html
<html>
<body >
<form action="/Ragis/proces.jsp" method=post>
<center>
<table cellpadding=2 cellspacing=1 border="1" bgcolor="lightblue">
<th bgcolor="lightblue" colspan=2>
<font size=5>User Registration</font>
<br>
<font size=2 color="red"><sup>*</sup> Required Fields</font>
</th>
<tr bgcolor="lightblue">
<td valign=top>
<b>First Name<sup>*</sup></b>
<br>
<input type="text" name="firstName" value="" size=20 maxlength=20></td>
<td valign=top>
<b>Last Name<sup>*</sup></b>
<br>
<input type="text" name="lastName" value="" size=15 maxlength=20></td>
</tr>
<tr bgcolor="lightblue">
<td valign=top>
<b>E-Mail<sup>*</sup></b>
<br>
<input type="text" name="email" value="" size=25 maxlength=125>
<br></td>
<td valign=top>
<b>Cell Nr(9 fig.)<sup>*</sup></b>
<br>
<input type="text" name="zip" value="" size=10 maxlength=9></td>
</tr>
<tr bgcolor="lightblue">
<td valign=top colspan=2>
<b>User Name<sup>*</sup></b>
<br>
<input type="text" name="userName" size=20 value="" maxlength=10>
</td>
</tr>
<tr bgcolor="lightblue">
<td valign=top>
<b>Password<sup>*</sup></b>
<br>
<input type="password" name="password1" size=10 value="" maxlength=10></td>
<td valign=top>
<b>Confirm Password<sup>*</sup></b>
<br>
<input type="password" name="password2" size=10 value="" maxlength=10></td>
<br>
</tr>
<tr bgcolor="lightblue">
<td align=center colspan=2>
<input type="submit" value="Submit"> <input type="reset"
value="Reset">
</td>
</tr>
</table>
</center>
</form>
</body>
</html>
proces.jsp
<%@ page language="java" %>
<%@ page import="java.util.*" %>
<%!
%>
<jsp:useBean id="formHandler" class="test.FormBean" scope="request">
<jsp:setProperty name="formHandler" property="*"/>
</jsp:useBean>
<% if (formHandler.validate()) {
%>
<html>
<body>
<center>
<form action="/Ragis/Registration" method=post>
<input type="submit" name="Submit" value="Submit" style="background-color:#49743D;font-weight:bold;color:#ffffff;"/>
</form>
<table cellpadding=1 cellspacing=1 border="1" >
<th bgcolor="lightblue" colspan=2>
<font size=5>Almost done! Just press SUBMIT to finish the registration procedure!</font>
</th>
<font size=4>
<tr bgcolor="lightblue">
<td valign=top>
<b>First Name</b>
<br>
<jsp:getProperty name="formHandler" property="firstName"/>
</td>
<td valign=top>
<b>Last Name</b>
<br>
<jsp:getProperty name="formHandler" property="lastName"/>
</td>
</tr>
<tr bgcolor="lightblue">
<td valign=top>
<b>E-Mail</b>
<br>
<jsp:getProperty name="formHandler" property="email"/>
<br></td>
<td valign=top>
<b>Cell Nr(9 fig.)</b>
<br>
<jsp:getProperty name="formHandler" property="zip"/>
</td>
</tr>
<tr bgcolor="lightblue">
<td valign=top colspan=2>
<b>User Name</b>
<br>
<jsp:getProperty name="formHandler" property="userName"/>
</td>
</tr>
</font>
</table>
</center>
</body>
</html>
<%
} else {
%>
<jsp:forward page="retry.jsp"/>
<%
}
%>
retry.jsp
<jsp:useBean id="formHandler" class="test.FormBean" scope="request"/>
<html>
<body>
<form action="/Ragis/proces.jsp" method=post>
<center>
<table cellpadding=4 cellspacing=2 border=0>
<th bgcolor="lightblue" colspan=2>
<font size=5>User Registration</font>
<br>
<font size=2 color="red"><sup>*</sup> Required Fields </font>
</th>
<tr bgcolor="lightblue">
<td valign=top>
<B>First Name<sup>*</sup></B>
<br>
<input type="text" name="firstName"
value='<%=formHandler.getFirstName()%>' size=15 maxlength=20>
<br><font size=2
color=red><%=formHandler.getErrorMsg("firstName")%></font>
</td>
<td valign=top>
<B>Last Name<sup>*</sup></B>
<br>
<input type="text" name="lastName"
value='<%=formHandler.getLastName()%>' size=15 maxlength=20>
<br><font size=2
color=red><%=formHandler.getErrorMsg("lastName")%></font>
</td>
</tr>
<tr bgcolor="lightblue">
<td valign=top>
<B>E-Mail<sup>*</sup></B>
<br>
<input type="text" name="email" value='<%=formHandler.getEmail()%>'
size=25 maxlength=125>
<br><font size=2 color=red><%=formHandler.getErrorMsg("email")%></font>
</td>
<td valign=top>
<B>Cell Nr(9 fig.)<sup>*</sup></B>
<br>
<input type="text" name="zip" value='<%=formHandler.getZip()%>' size=5
maxlength=9>
<br><font size=2 color=red><%=formHandler.getErrorMsg("zip")%></font>
</td>
</tr>
<tr bgcolor="lightblue">
<td valign=top colspan=2>
<B>User Name<sup>*</sup></B>
<br>
<input type="text" name="userName" size=10
value='<%=formHandler.getUserName()%>' maxlength=10>
<br><font size=2
color=red><%=formHandler.getErrorMsg("userName")%></font>
</td>
</tr>
<tr bgcolor="lightblue">
<td valign=top>
<B>Password<sup>*</sup></B>
<br>
<input type="password" name="password1" size=10
value='<%=formHandler.getPassword1()%>' maxlength=10>
<br><font size=2
color=red><%=formHandler.getErrorMsg("password1")%></font>
</td>
<td valign=top>
<B>Confirm Password<sup>*</sup></B>
<br>
<input type="password" name="password2" size=10
value='<%=formHandler.getPassword2()%>' maxlength=10>
<br><font size=2
color=red><%=formHandler.getErrorMsg("password2")%></font>
</td>
<br>
</tr>
<tr bgcolor="lightblue">
<td colspan=2 align=center>
<input type="submit" value="Submit">
</td>
</tr>
</table>
</center>
</form>
</body>
</html>
FormBean.java
package test;
import java.io.*;
import java.util.*;
public class FormBean {
private String firstName;
private String lastName;
private String email;
private String userName;
private String password1;
private String password2;
private String zip;
private String notify;
private Hashtable errors;
public boolean validate() {
boolean bool=true;
if (firstName.equals("")) {
errors.put("firstName","Please enter your first name");
firstName="";
bool=false;
}
if (lastName.equals("")) {
errors.put("lastName","Please enter your last name");
lastName="";
bool=false;
}
if (email.equals("") || (email.indexOf('@') == -1)) {
errors.put("email","Please enter a valid email address");
email="";
bool=false;
}
if (userName.equals("")) {
errors.put("userName","Please enter a username");
userName="";
bool=false;
}
if (password1.equals("")) {
errors.put("password1","Please enter a valid password");
password1="";
bool=false;
}
if (!password1.equals("") && (password2.equals("") ||
!password1.equals(password2))) {
errors.put("password2","Please confirm your password");
password2="";
bool=false;
}
if (zip.equals("") || zip.length() !=9) {
errors.put("zip","Please enter a valid cell number");
zip="";
bool=false;
} else {
try {
int x = Integer.parseInt(zip);
} catch (NumberFormatException e) {
errors.put("zip","Please enter a valid cell number");
zip="";
bool=false;
}
}
return bool;
}
public String getErrorMsg(String s) {
String errorMsg =(String)errors.get(s.trim());
return (errorMsg == null) ? "":errorMsg;
}
public FormBean() {
firstName="";
lastName="";
email="";
userName="";
password1="";
password2="";
zip="";
notify="";
errors = new Hashtable();
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public String getEmail() {
return email;
}
public String getUserName() {
return userName;
}
public String getPassword1() {
return password1;
}
public String getPassword2() {
return password2;
}
public String getZip() {
return zip;
}
public String getNotify() {
return notify;
}
public void setFirstName(String fname) {
firstName =fname;
}
public void setLastName(String lname) {
lastName =lname;
}
public void setEmail(String eml) {
email=eml;
}
public void setUserName(String u) {
userName=u;
}
public void setPassword1(String p1) {
password1=p1;
}
public void setPassword2(String p2) {
password2=p2;
}
public void setZip(String z) {
zip=z;
}
public void setErrors(String key, String msg) {
errors.put(key,msg);
}
public void setNotify(String n) {
notify=n;
}
}
Registration.java
package test;
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Registration extends HttpServlet{
/**
*
*/
private static final long serialVersionUID = 1L;
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:3306/jsp";
Connection connection=null;
ResultSet rs;
res.setContentType("text/html");
PrintWriter out = res.getWriter();
String firstNamed = req.getParameter("firstName");
String lastNamed = req.getParameter("lastName");
String emaild = req.getParameter("email");
String userNamed = req.getParameter("userName");
String password1d = req.getParameter("password1");
String zipd = req.getParameter("zip");
String auto = "u";
try {
Class.forName("org.gjt.mm.mysql.Driver");
connection = DriverManager.getConnection(connectionURL, "root", "root");
String sql = "insert into userprofile values (?,?,?,?,?,?,?)";
PreparedStatement pst = connection.prepareStatement(sql);
pst.setString(1, firstNamed);
pst.setString(2, lastNamed);
pst.setString(3, emaild);
pst.setString(4,userNamed);
pst.setString(5, password1d);
pst.setString(6, zipd);
pst.setString(7, auto);
int numRowsChanged = pst.executeUpdate();
out.println(" Welcome : ");
out.println(" '"+userNamed+"'");
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);
}
}
}
}
簡述：ragister.html - > proces.jsp，如果所有信息有效 - > Registration.java與錯誤描述將數據發送到DB，否則retry.jsp直到一切好。 看來工作preety不錯，但在數據庫中，我得到一個錶行用空值填充:(
可能是我犯的錯誤試圖Registration.java讀取數據。 請，請幫我和索裏，如果我目前還不清楚任何地方。
是的，它是唯一的問題在這裏。你能告訴我我應該寫些什麼？我嘗試了很多東西，但我無法弄清楚...只是發送這個參數到servlet – kibicrealu1 2012-01-12 06:53:50
把 ''和其他文本域爲 '
' – 2012-01-12 12:10:38但我不想輸入數據再次，只是爲了從jsp到servlet獲取所有的參數 – kibicrealu1 2012-01-12 13:04:30