jsp第十周作业
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
1.
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
%>
<!DOCTYPE HTML>
<html>
<head>
<title>login</title>
</head>
<body>
<form action="dologin.jsp" method="post">
账号<input type="text" name="uname"><br>
密码<input type="password" name="password"><br>
<input type="submit" value="登录">
<a href="register.jsp">注册</a>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML>
<html>
<head>
<title>dologin</title>
</head>
<body>
登陆成功
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
%>
<!DOCTYPE HTML>
<html>
<head>
<title>注册</title>
</head>
<body>
<form action="doregister.jsp" method="post">
账号<input type="text" name="uname"><br>
密码<input type="password" name="password"><br>
年龄<input type="number" name="age"><br>
<input type="submit" value="注册">
<input type="reset" value="重置">
</form>
</body>
</html>
<%@page import="Stu.dao"%>
<%@page import="javax.xml.bind.ParseConversionEvent"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
%>
<!DOCTYPE HTML>
<html>
<head>
<title></title>
</head>
<body>
<%
String uname = request.getParameter("uname");
String password = request.getParameter("password");
String age = request.getParameter("age");
int age1 = age == null ? -1 : Integer.parseInt(age);
StuDao sd=new StuDao();
int i=sd.Register(uname, password, age1);
if(i>0){
request.getRequestDispatcher("login.jsp").forward(request, response);
}
%>
</body>
</html>
<%@page import="Stu.dao"%>
<%@page import="javax.xml.bind.ParseConversionEvent"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
%>
<!DOCTYPE HTML>
<html>
<head>
<title></title>
</head>
<body>
<%
String uname = request.getParameter("uname");
String password = request.getParameter("password");
StuDao sd=new StuDao();
if(sd.Login(uname, password)){
request.getRequestDispatcher("login.jsp").forward(request, response);
}else{
out.print("登陆失败，3秒后跳回主页");
response.setHeader("refresh", "3;url=login.jsp");
}
%>
</body>
</html>
package Stu;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class dao {
public static Connection getConnection() {
Connection con = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root");
System.out.println(con);
} catch (Exception e) {
e.printStackTrace();
}
return con;
}
protected static 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 Stu;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class entity{
public int Register(String uname, String password, int age) {
int i = -1;
Connection con = dao.getConnection();
String sql = "insert into stu(uname,password,age)values(?,?,?)";
PreparedStatement pred = null;
try {
pred=con.prepareStatement(sql);
pred.setString(1, uname);
pred.setString(2, password);
pred.setInt(3, age);
i = pred.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
dao.closeAll(con, pred, null);
}
return i;
}
public boolean Login(String uname, String password) {
boolean f = false;
Connection con = dao.getConnection();
String sql = "select * from stu where uname=? and password=?";
PreparedStatement pred = null;
ResultSet resultSet = null;
try {
pred = con.prepareStatement(sql);
pred.setString(1, uname);
pred.setString(2, password);
resultSet = pred.executeQuery();
while (resultSet.next()) {
f = true;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
dao.closeAll(con, pred, resultSet);
}
return f;
}
}
}
