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
package com.gd.entity; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; 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?serverTimezone=UTC&useSSL=false","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(); } } }
package com.gd.entity; 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) { Connection conn = getConnection(); PreparedStatement ps = null; try { String sql = "insert into stu(uname,upwd) values(?,?)"; // 2个占位符 // 4.执行SQL语句 ps = conn.prepareStatement(sql); ps.setString(1, uname); ps.setString(2, upwd); ps.executeUpdate();// 增删改都用这个 } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { closeAll(conn, ps, null); } } }
<body>
<script type="text/javascript">
function validate(){
if(loginForm.uname.value==""){
alert("账号不能为空!");
return;
}
if(loginForm.upwd1.value==""){
alert("密码不能为空!");
return;
}
if(loginForm.upwd1.value!=loginForm.upwd2.value){
alert("密码不一致，请重新输入!");
return;
}
loginForm.submit();
}
</script>
<form name="loginForm" action="dozhuce.jsp" method="post">
用户名:<input type="text" name="uname" ><br>
密码: <input type="password" name="upwd1" ><br>
确认密码: <input type="password" name="upwd2" >
<input type="button" value="注册" onClick="validate()">
</form>
</body>
<body>
<%
StuDao sd=new StuDao();
request.setCharacterEncoding("utf-8");
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd1");
sd.reg(uname, upwd);
session.setAttribute("uname", uname);
out.print("注册失败，即将跳回登陆页.....");
request.getRequestDispatcher("index.jsp").forward(request, response);
%>
</body>
<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 name="loginForm" action="dologin.jsp" method="post">
用户名:<input type="text" name="uname" ><br>
密码: <input type="password" name="upwd" >
<input type="button" value="登录" onClick="validate()">
</form>
</body>
<body>
<%
StuDao sd=new StuDao();
request.setCharacterEncoding("utf-8");
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd");
if (sd.login(uname, upwd)){
session.setAttribute("uname", uname);
request.getRequestDispatcher("main.jsp").forward(request, response);
}else{
out.print("登陆失败，即将跳回登陆页.....");
response.setHeader("refresh", "3;url=index.jsp");
}
%>
</body>
<body>
<%
request.setCharacterEncoding("utf-8");
String uname=(String)session.getAttribute("uname");
%>
登录成功！欢迎你<%=uname %>
</body>
posted on
