第十周作业
5.4上机练习
数据库test 中建个表 stu(stuid 主键 自动增长 ，用户名，密码，年龄)
1.设计一个注册页面，实现用户注册功能
2.设计一个登陆页面，实现用户名密码登陆
3.两个页面可以互相超链接
BaseDao.java:
package com;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
public class BaseDao {
//获取连接
protected Connection getConnection(){
Connection conn=null;
try {
Class.forName("com.mysql.jdbc.Driver");
// 2.建立连接
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "123456");
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
//关闭连接
protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){
try {
if(rs != null)
rs.close();
if(ps != null)
ps.close();
if(con != null)
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
StuDao.java:
package com;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class StuDao extends BaseDao {
public boolean login(String name, String pwd) {
boolean f = false;
Connection conn = getConnection();
String sql = "select * from stu where uname=? and upwd=?";
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, name);
ps.setString(2, pwd);
rs = ps.executeQuery();
if (rs.next())
f = true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, rs);
}
return f;
}
public void reg(String uname, String upwd,int uage) {
Connection conn = getConnection();
PreparedStatement ps = null;
try {
String sql = "insert into stu(uname,upwd,uage) values(?,?,?)";
// 4.执行SQL语句
ps = conn.prepareStatement(sql);
ps.setString(1, uname);
ps.setString(2, upwd);
ps.setInt(3, uage);
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, null);
}
}
}
login.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<script type="text/javascript">
function validate(){
if(loginForm.uname.value==""){
alert("账号不能为空!");
return;
}
if(loginForm.upwd.value==""){
alert("密码不能为空!");
return;
}
loginForm.submit();
}
</script>
<form action="dologin.jsp" method="post">
<b>用户名</b>
<input type="text" name="uname" />
<br />
<b>密码</b>
<input type="text" name="upwd" />
<br />
<input type="submit" value="登录" />
<a href="register.jsp">注册</a>
</form>
</body>
</html>
register.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="jump.jsp" method="post">
<b>用户名</b>
<input type="text" name="uname" />
<br />
<b>密码</b>
<input type="text" name="upwd" />
<br />
<b>年龄</b>
<input type="text" name="uage"/>
<br />
<input type="submit" value="注册" />
<a href="login.jsp">登录</a>
</form>
</body>
</html>
jump.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="com.StuDao"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd");
String uages = request.getParameter("uage");
int uage = Integer.parseInt(uages);
StuDao s1 = new StuDao();
s1.reg(uname, upwd, uage);
request.getRequestDispatcher("login.jsp").forward(request, response);
%>
</body>
</html>
dologin.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="com.StuDao"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<%
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd");
StuDao s1 = new StuDao();
if (s1.login(uname, upwd)) {
request.getRequestDispatcher("main.jsp").forward(request, response);
} else {
request.getRequestDispatcher("logout.jsp").forward(request, response);
}
%>
</body>
</html>
main.jsp:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>???????</title>
</head>
<body>
<h1>登录成功</h1>
</body>
</html>
logout.jsp:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>???????</title>
</head>
<body>
<h1>登录失败,3秒后返回登录界面</h1>
<%
response.setHeader("refresh", "3;url=login.jsp");
%>
</body>
</html>
