第十周作业
package zhuce2;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DbUtil {
static {
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static Connection getCon() {
Connection con = null;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "123456");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return con;
}
}
package zhuce2;
public class User {
private Integer id;
private String uname;
private String password;
private Integer age;
public User() {
}
public User(String uname, String password, Integer age) {
super();
this.uname = uname;
this.password = password;
this.age = age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
package zhuce2;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDao {
public void regUser(User user) {
// String sql = "insert into stu(uname,password,age) value( " + user.getUname() + "," + user.getPassword() + ","
// + user.getAge() + ")";
String sql = "insert into stu(uname,password,age) value(?,?,?)";
// 建立数据库链接
Connection con = DbUtil.getCon();
try {
// 预编译
PreparedStatement pred = con.prepareStatement(sql);
// 替换占位符
pred.setString(1, user.getUname());
pred.setString(2, user.getPassword());
pred.setInt(3, user.getAge());
// 执行sql语句
pred.executeUpdate();
pred.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public User getUserByName(String uname) {
User user = null;
String sql = "select * from stu where uname = ?";
Connection con = DbUtil.getCon();
try {
// 预编译
PreparedStatement pred = con.prepareStatement(sql);
// 替换占位符
pred.setString(1, uname);
// 执行sql语句
ResultSet res = pred.executeQuery();
if (res.next()) {
user = new User(res.getString("uname"), res.getString("password"), res.getInt("age"));
}
pred.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return user;
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="dologin.jsp" name="formName">
用户名：<input type="text" name="uname"> <br> 密码：<input
type="password" name="password"><br> <input
type="button" value="登录" onclick="toDoLogin()"> <input
type="button" value="注册" onclick="toReg()">
</form>
<script>
function toReg() {
window.location.href = 'reg.jsp';
}
function toDoLogin() {
if (formName.uname.value == '' || formName.password.value == '') {
alert('账号密码不能为空');
} else {
formName.submit();
}
}
</script>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="doReg.jsp" method="post">
用户名：<input type="text" name="uname"><br>
密码：<input type="password" name="password"><br>
确认密码：<input type="password"><br>
年龄：<input type="text" name="age"><br>
<input type="submit" value="注册">
</form>
</body>
</html>
<%@page import="zhuce2.UserDao"%>
<%@page import="zhuce2.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
String uname = request.getParameter("uname");
String password = request.getParameter("password");
Integer age = Integer.parseInt(request.getParameter("age"));
User user = new User(uname, password, age);
UserDao userDao = new UserDao();
userDao.regUser(user);
response.sendRedirect("index.jsp");
%>
</body>
</html>
<%@page import="zhuce2.User"%>
<%@page import="zhuce2.UserDao"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
String uname = request.getParameter("uname");
String password = request.getParameter("password");
UserDao userDao = new UserDao();
User user = userDao.getUserByName(uname);
if (password.equals(user.getPassword())) {
response.sendRedirect("main.jsp");
} else {
%>
<script>
alert('账号或密码错误');
</script>
<%
response.sendRedirect("index.jsp");
}
%>
</body>
</html>
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