1.需要网站系统开发需要掌握的技术;
-
至少熟悉一种建站程序。
-
对空间和域名的知识有一定的了解。
-
有一些美工基础。
-
对编程有一些了解。
-
代码知识基本的要懂。
-
css+div会一点。
-
简单的网站优化技术。
-
熟悉引擎规则。
2.源程序代码
1.package com.jaovo.msg.dao;
//import java.util.List;
import com.jaovo.msg.model.User;
public interface ILoginDao {//�ӿ�
public void add(User user);
public void delete(String name);
public void update(User user);
public void judge(User user);
/*public User load(String name);
public User load(String password);
public List<User> load();*/
}
2.package com.jaovo.msg.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.jaovo.msg.Util.DBUtil;
import com.jaovo.msg.Util.UserException;
import com.jaovo.msg.model.User;
public class UserDaoImpl implements ILoginDao{
@Override
public void add(User user) {
// TODO Auto-generated method stub
//��ö���
Connection connection =DBUtil.getConnection();
//��SQL��䣻
String sql="select count(*) from User_1 where name=? ";//��ѯ��û��
//������䴫�����
PreparedStatement preparedStatement=null;
ResultSet resultSet=null;
try {
preparedStatement=connection.prepareStatement(sql);
preparedStatement.setString(1, user.getName());
//���ܽ����
resultSet=preparedStatement.executeQuery();
//����
while(resultSet.next()){//�������
if(resultSet.getInt(1)>0){//1Ϊ��һ���ʺ�
throw new UserException("�û��Ѵ���");
}
}//���û�о������ݿ��������
sql="insert into User_1(name,password) value(?,?)";
preparedStatement=connection.prepareStatement(sql);
preparedStatement.setString(1,user.getName());
preparedStatement.setString(2,user.getPassword());
preparedStatement.executeUpdate();//����
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{//�ر���Դ�ķ���
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public void delete(String name) {
// TODO Auto-generated method stub
Connection connection =DBUtil.getConnection();
String sql="delete from User_1 where name=?";
PreparedStatement preparedStatement=null;
try {
preparedStatement=connection.prepareStatement(sql);
preparedStatement.setString(1,name);
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public void update(User user) {
// TODO Auto-generated method stub
Connection connection=DBUtil.getConnection();
String sql="update User_1 set password=?";
PreparedStatement preparedStatement=null;
//ResultSet resuleSet=null;
try {
preparedStatement=connection.prepareStatement(sql);
//preparedStatement.setString(1, user.getName());
preparedStatement.setString(1, user.getPassword());
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void judge(User user){
Connection connection=DBUtil.getConnection();
//String sql="select count(*) from User_1 where name=?";
String sql = "select * from User_1";
PreparedStatement preparedStatement=null;
ResultSet resultSet=null;
int flag = 0;
try {
preparedStatement=connection.prepareStatement(sql);
//preparedStatement.setString(1, user.getName());
//preparedStatement.setString(2, user.getPassword());
resultSet=preparedStatement.executeQuery();//结果集
while(resultSet.next()){//�������
//1Ϊ��һ���ʺ�
String name = resultSet.getString("用户名");
String password = resultSet.getString("密码");
if(name.equals(user.getName())&&password.equals(user.getPassword())){
System.out.print("登陆成功");
flag = 1;
break;
}
}
if(flag!=1)throw new UserException("用户名或密码错误");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{//�ر���Դ�ķ���
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
}
3.package com.jaovo.msg.model;
public class User {
private String name;
private String password;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
4.package com.jaovo.msg.Util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBUtil { //�������ݿ����
/*public static Connection getConnection(){
return null;
}*/
private static final String DRIVER=
"com.microsoft.sqlserver.jdbc.SQLServerDriver"; //������
private static final String URL=
"jdbc:sqlserver://localhost:1433;DatabaseName=jqk;";//URL
private static final String USER="sa"; //����
private static final String PASSWORD="root"; //����
public static Connection getConnection() { //�������ݿ�
Connection connection=null;
try{
Class.forName(DRIVER); //ע������
connection=DriverManager.getConnection(URL,USER,PASSWORD);//��������
}catch(Exception ex) {
//ex.printStackTrace();
System.out.println(ex.getMessage());
}
return connection;
}
//�ر���Դ�ķ���
public static void close(Connection connection){
try {
if(connection!=null){
connection.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(PreparedStatement prepareStatement){
try {//
if(prepareStatement!=null){
prepareStatement.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(ResultSet resultSet){
try {//�����������Ҫ��Բ�ѯ
if(resultSet!=null){
resultSet.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
5.package com.jaovo.msg.Util;
public class UserException extends RuntimeException {
public UserException() {
super();
// TODO Auto-generated constructor stub
}
public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
}
public UserException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
}
public UserException(String message) {
super(message);
// TODO Auto-generated constructor stub
}
public UserException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
}
}
6.<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>用户登录</title>
</head>
<body>
<%=request.getAttribute("error") %>
<form action="add.jsp" method="post">
<table align="center" border="1" width="250">
<tr>
<td>用户名 ：</td>
<td>
<input type="text" name="name" />
</td>
</tr>
<tr>
<td>密码 ：</td>
<td>
<input type="password" name="password" />
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="登录" />
</td>
</tr>
</table>
</form>
</body>
</html>
7.<%@page import="com.jaovo.msg.model.User" %>
<%@page import="com.jaovo.msg.dao.UserDaoImpl" %>
<%@page import="com.jaovo.msg.Util.UserException"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<%
String name=request.getParameter("name");
String password=request.getParameter("password");
System.out.println(name);
System.out.println(password);
if(name==null||"".equals(name.trim())){
request.setAttribute("error","用户名不能为空！");
%>
<jsp:forward page="addInput.jsp"></jsp:forward>
<%
}
User user = new User();
user.setName(name);
user.setPassword(password);
UserDaoImpl userDao=new UserDaoImpl();
userDao.judge(user);
%>
</html>
3.截图
1.创建数据库，创建表，有用户名，密码两列；
2.用户名为空
.
3.输入正确；
4.输入错误
4.未完成原因
1.对数据库链接不够熟悉，获得SQL语句与web界面基本代码不熟悉；
5.希望与目标
希望可以独立完整的开发一个简单的网页版miss系统；