jsp与Javabean实现登陆注册
jsp技术+Mysql数据库编程，结合javabean组件，实现最简单基础的一个注册登陆demo
思路：首先须要登陆页面以及相应的登陆验证，对于未注册用户须要点击注册按钮进行用户信息注册，注册一样须要一个注册表单以及各个字段的验证处理。为了简化JavaBean中的处理和重用，咱们把用户的信息封装成一个值对象的JavaBean，这个JavaBean只包含 用户信息相关的属性和这些属性相关的getter和setter方法，咱们将其命名为UserInfo.java，其次，随着JSP技术的发展和开发技术的成熟，在JSP页面中链接数据库的编程方式已经不多见，虽然在JSP页面中使用Scriptlets也能够链接数据库，进行数据库操做，但这样会形成页面难以维护等缺点，在大型项目中，这些缺点会更加突出，因此咱们建议在JavaBean中链接数据库，UserRegiste.java用来处理注册时链接数据库查询事务，UserLogin.java用来处理登陆时链接数据库插入事务。
JavaBean开发
表示用户信息的JavaBean(UserInfo.java)
public class UserInfo {
private String name;
private String password;
private String phone;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}
在Mysql数据库中建立数据库及相应的表格
create database jspdev;
use jspdev;
create table user_Info( name varchar(15), password varchar(20), phone varchar(15) );
注册用户时执行数据库操做的JavaBean（UserRegist.java）
import java.io.UnsupportedEncodingException;
import java.sql.DriverManager;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
public class UserRegist {
private UserInfo userInfo;
private Connection con;
public UserRegist() {
String Classforname = "com.mysql.jdbc.Driver";
String Servanddb = "jdbc:mysql://127.0.0.1/jspdev";
String user = "root";
String pwd = "123456";
try {
Class.forName(Classforname);
con = (Connection) DriverManager.getConnection(Servanddb, user, pwd);
} catch (Exception e) {
e.printStackTrace();
}
}
public void setUserInfo(UserInfo userInfo) {
this.userInfo = userInfo;
}
public void regist() throws Exception {
String reg = "insert into user_Info values(?,?,?)";
try {
PreparedStatement pstmt = (PreparedStatement) con.prepareStatement(reg);
pstmt.setString(1, transFormat(userInfo.getName()));
pstmt.setString(2, userInfo.getPassword());
pstmt.setString(3, userInfo.getPhone());
pstmt.execute();
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
String transFormat(String s) {
try {
byte[] b = s.getBytes("iso-8859-1");
s = new String(b);
} catch (UnsupportedEncodingException e) {
System.out.println(e.toString());
}
return s;
}
}
用户登陆时链接数据库处理的JavaBean(UserLogin.java)
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import com.mysql.jdbc.Connection;
public class UserLogin {
private UserInfo userInfo;
private Connection con;
public UserLogin() {
String Classforname = "com.mysql.jdbc.Driver";
String Servanddb = "jdbc:mysql://127.0.0.1/jspdev";
String user = "root";
String pwd = "123456";
try {
Class.forName(Classforname);
con = (Connection) DriverManager.getConnection(Servanddb, user, pwd);
} catch (Exception e) {
e.printStackTrace();
}
}
public void setUserInfo(UserInfo userInfo) {
this.userInfo = userInfo;
}
public boolean login(String name, String password) throws Exception {
try {
Statement stmt = con.createStatement();
ResultSet rst = stmt.executeQuery(
"select name, password from user_Info where name= '" + name + "' and password='" + password + "'");
if (rst.next()) {
rst.close();
stmt.close();
con.close();
return false;
} else {
rst.close();
stmt.close();
con.close();
return true;
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
JSP页面的开发
填写用户注册信息的JSP页面（register.jsp）
<%@page import="org.apache.jasper.tagplugins.jstl.core.Out"%>
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<%@ page import="java.sql.*,java.io.*"%>
<jsp:useBean id="info" class="webUser.UserInfo" scope="request">
<jsp:setProperty property="*" name="info" />
</jsp:useBean>
<jsp:useBean id="regist" class="webUser.UserRegist" scope="request">
<jsp:setProperty property="*" name="regist" />
</jsp:useBean>
<%! String transFormat(String s){ try{ byte []b=s.getBytes("iso-8859-1"); s=new String(b); } catch(UnsupportedEncodingException e){ System.out.println(e.toString()); } return s; } %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>登陆首页</title>
<script type="text/javascript"> function register() { if (document.registerform.name.values == "") { window.alert("请输入用户名称"); document.registerform.name.focus(); return false; } if (document.registerform.password.value == "") { window.alert("请输入密码"); document.registerform.password.focus(); return false; } if (document.registerform.repassword.value == "") { window.alert("请确认密码"); document.registerform.repassword.focus(); return false; } if (document.registerform.password.value != document.registerform.repassword.value) { window.alert("两次密码不一样，请从新输入"); document.registerform.repassword.focus(); return false; } if (document.registerform.phone.value == "") { window.alert("请输入电话号码"); document.registerform.phone.focus(); return false; } return true; } </script>
</head>
<body bgcolor=cyan>
<font size=4> <% /* request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html; charset=utf-8"); */ String name = request.getParameter("name"); String password = request.getParameter("password"); String repassword = request.getParameter("repassword"); String phone = request.getParameter("phone"); if (name == null) { name = ""; if (password == null) { password = ""; if (repassword == null) { repassword = ""; if (phone == null) { phone = ""; } } } } boolean isSuccessRegist = false; if (password.equals(repassword) && !name.equals("") && !password.equals("") && !repassword.equals("") && !phone.equals("")) { name=transFormat(name); regist.setUserInfo(info); regist.regist(); isSuccessRegist = true; } %>
<form action="" method=post name=registerform>
<table width="100%" height="500" align="center">
<tr>
<td>
<div heigh="100%" align="center">
<table border="0" align="center">
<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>
<td>确认密码：</td>
<td><input type="password" name="repassword"></td>
</tr>
<tr>
<td>手机号码：</td>
<td><input type="text" name="phone"></td>
</tr>
</table>
<p align="center">
<a href="login.jsp"><input type="button" value="登陆" name="button"></a> <input type="submit" value="注册" name="regist" onclick="register()">
</p>
<font size=4 color=red> <% if(isSuccessRegist){ out.println(name); out.println("注册成功"); } %>
</font>
</div>
</td>
</tr>
</table>
</form>
</font>
</body>
</html>
用户登陆页面（login.jsp）
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<jsp:useBean id="info" class="webUser.UserInfo" scope="request">
<jsp:setProperty property="*" name="info" />
</jsp:useBean>
<jsp:useBean id="login" class="webUser.UserLogin" scope="request">
<jsp:setProperty property="*" name="login" />
</jsp:useBean>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>登陆首页</title>
<script type="text/javascript"> function login() { if (document.registerform.name.values == "") { window.alert("请输入用户名称"); document.registerform.name.focus(); return false; } if (document.registerform.password.value == "") { window.alert("请输入密码"); document.registerform.password.focus(); return false; } return true; } </script>
</head>
<body bgcolor=cyan>
<font size=4> <% String name = request.getParameter("name"); String password = request.getParameter("password"); if (name == null) { name = ""; if (password == null) { password = ""; } } boolean isSuccessLogin = false; if (!name.equals("") && !password.equals("")) { login.setUserInfo(info); isSuccessLogin = login.login(name,password); if (isSuccessLogin) { response.sendRedirect("welcome.jsp"); } isSuccessLogin = false; } %>
<form action="" method=post name=form>
<table width="100%" height="500" align="center">
<tr>
<td>
<div heigh="100%" align="center">
<table border="0" align="center">
<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>
</table>
<p align="center">
<input type="submit" value="登陆" name="login" onclick="login()">
<a href="register.jsp"><input type="button" value="注册" name="button"></a>
</p>
</div>
</td>
</tr>
</table>
</form>
</font>
</body>
</html> ### 登陆成功跳转页面（Main.jsp） ###
<%@ page language="java" contentType="text/html; charset=gb2312"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>主页面</title>
</head>
<body bgcolor=cyan><font size=6 color=red>
<div height="100%" align="center" valign="center">
<br><br>欢迎来到本页面！！！
</div>
</font>
</body>
</html>
运行结果
