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>
