使用JSP+JavaBean模式编写一个简单的用户信息管理系统
考虑实现一个数据库单表操作的简单Web应用，系统需求例如以下：
普通用户功能：用户登录系统。用户注冊；
1、数据库设计
在SQL Server中使用企业管理器建立数据库和user表。user表的字段设计例如以下：
|
字段名 |
id |
name |
password |
|
age |
birthday |
money |
|
描写叙述 |
自增型int |
varchar |
varchar |
varchar |
int |
datetime |
float |
2、创建User JavaBean
创建User JavaBean，其属性和类型例如以下：
|
属性名 |
id |
name |
password |
|
age |
birthday |
money |
|
类型 |
int |
String |
String |
String |
int |
datetime |
float |
3、为User JavaBean添加业务方法
Student JavaBean的业务方法有login、register。分别实现用户登录验证、注冊用户信息。在Student JavaBean中添加实现上述功能的代码并測试释放正常。
4、编写JSP页面实现用户登录、用户注冊
编写实现用户登录、注冊的页面，并调试程序是否正常。
User类:
package JavaBeen_Demo;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class User {
private int id;
private String name;
private String password;
private int age;
private String email;
private String birthday;
private float money;
public User(){};
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
public float getMoney() {
return money;
}
public void setMoney(float money) {
this.money = money;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
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;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
//登录
public User login(){
User user=null;
DBConnection db=new DBConnection();
Connection conn=null;
PreparedStatement ps=null;
ResultSet rs=null;
try {
conn=db.getConnection();
String sql="select * from yonghu where name='"+this.name+"'";
System.out.println(sql);
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
while(rs.next()){
user=new User();
user.name=rs.getString("name");
user.password=rs.getString("password");
user.age=rs.getInt("age");
user.email=rs.getString("email");
user.birthday=rs.getString("birthday");
user.money=rs.getFloat("money");
}
} catch (SQLException e) {
e.printStackTrace();
}
db.close(rs);
db.close(ps);
db.close(conn);
return user;
}
//注冊
public boolean register(){
DBConnection db=new DBConnection();
Connection conn=null;
PreparedStatement ps=null;
boolean flag=false;
try {
conn=db.getConnection();
String sql="insert into yonghu values(?,?,?,?,?,?)";
ps=conn.prepareStatement(sql);
ps.setString(1, this.name);
ps.setString(2,this.password);
ps.setInt(3,this.age);
ps.setString(4,this.email);
ps.setString(5,this.birthday);
ps.setFloat(6,this.money);
ps.executeUpdate();
flag=true;
} catch (SQLException e) {
e.printStackTrace();
}
db.close(ps);
db.close(conn);
return flag;
}
}
连接数据库（SQL Server）：
package JavaBeen_Demo;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBConnection {
static String user="sa";
static String password="a123456";
static String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
static String url="jdbc:sqlserver://localhost:1433;DatabaseName=User";
Connection conn;
PreparedStatement ps;
ResultSet rs;
static{
try {
Class.forName(driverName);
} catch (ClassNotFoundException e) {
System.out.println("鍔犺浇椹卞姩鍑洪敊");
}
}
public Connection getConnection() throws SQLException{
conn=DriverManager.getConnection(url,user,password);
return conn;
}
public void close(Connection connection,PreparedStatement preparedStatement,ResultSet rsResultSet) {
try {
if (null!=rsResultSet) {
rsResultSet.close();
}
if (null != preparedStatement) {
preparedStatement.close();
}
if(null!=connection){
connection.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public void close(Connection conn) {
try {
if(conn != null) {
conn.close();
conn = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public void close(PreparedStatement ps) {
try {
if(ps != null) {
ps.close();
ps = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public void close(ResultSet rs) {
try {
if(rs != null) {
rs.close();
rs = null;
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
主界面：
<!DOCTYPE html>
<html>
<head>
<title>Main.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<a href="log.html" name="log">登录</a><br/>
<a href="registerl.html" name="register">注冊</a><br/>
</body>
</html>
登录界面：
<!DOCTYPE html> <html> <head> <title>log.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <center> 用户登录 <form action="../JSP/log_do.jsp" method="post"> username：<input type="text" name="name" /><br /> 密码： <input type="password" name="password" /><br /> <input type="submit" value="登录" /> </form> </center> </body> </html>
注冊界面：
<!DOCTYPE html>
<html>
<head>
<title>registerl.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->
</head>
<body>
<center>
注冊界面
<form action="../JSP/register_do.jsp" method="post">
username：<input type="text" name="name"/><br/>
密码：<input type="password" name="password"/><br/>
年龄：<input type="text" name="age"/><br/>
邮箱：<input type="text" name="email"/><br/>
生日：<input type="text" name="birthday"/><br/>
金钱：<input type="text" name="money"/><br/>
<input type="submit" value="注冊"/><br/>
</form>
</center>
</body>
</html>
登录界面的操作：
<%@ page language="java" import="java.util.*,JavaBeen_Demo.*" 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>
<base href="<%=basePath%>">
<title>登录操作</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<!-- javabeen -->
<jsp:useBean id="user" class="JavaBeen_Demo.User" scope="session"/>
<jsp:setProperty name="user" property="*"/>
<%
User new_user=user.login();
request.setAttribute("info", new_user);//传对象
if(new_user!=null){//假设存在此user
request.getRequestDispatcher("Info.jsp").forward(request, response);
}
else{
request.getRequestDispatcher("Faild.jsp").forward(request, response);
}
%>
</body>
</html>
注冊界面操作：
<%@ page language="java" import="java.util.*,JavaBeen_Demo.*" 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>
<base href="<%=basePath%>">
<title>注冊操作</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
</head>
<body>
<jsp:useBean id="user" class="JavaBeen_Demo.User" scope="session"/>
<jsp:setProperty name="user" property="*"/>
<%
boolean flag=user.register();
if(flag){
request.getRequestDispatcher("Success.jsp").forward(request, response);
}
else{
request.getRequestDispatcher("Faild.jsp").forward(request, response);
}
%>
</body>
</html>
个人信息界面：
<%@ page language="java" import="java.util.*,JavaBeen_Demo.*" 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>
<base href="<%=basePath%>">
<title>个人信息</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<center>
<%
User user=(User)request.getAttribute("info");//接收对象
%>
id:
<%=user.getId() %><br/>
name:
<%=user.getName() %><br/>
password:
<%=user.getPassword() %><br/>
age:
<%=user.getAge() %><br/>
birthday:
<%=user.getBirthday() %><br/>
email:
<%=user.getEmail() %><br/>
money:
<%=user.getMoney() %><br/>
</center>
</body>
</html>
登录成功界面：
<%@ 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>
<base href="<%=basePath%>">
<title>My JSP 'Success.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
注冊成功。
</body>
</html>
登录失败界面：
<%@ 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>
<base href="<%=basePath%>">
<title>My JSP 'Faild.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
注册失败！
</body>
</html>