<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登录页面</title>
</head>
<body>
<form action="/demo02_anli/userDaoServlet" method="post">
<label> 用户名：<input type="text" name="username" placeholder="请输入用户名"></label><br>
<label>密码：<input type="text" name="password" placeholder="请输入密码"></label><br>
<input type="submit" value="登录">
</form>
</body>
</html>
// 这是使用demo02的数据库
USE demo02;
// 创建一个名为user的表格
CREATE TABLE USER(
id INT PRIMARY KEY AUTO_INCREMENT,
username VARCHAR(32) UNIQUE NOT NULL,
PASSWORD VARCHAR(32) NOT NULL
);
// 向表格中添加数据
INSERT INTO USER(id ,username,PASSWORD) VALUES(NULL,'wangwu','134');
// 查看表格
SELECT * FROM USER
数据库中创建出来的user表格 图片：
package domain;
/*
一个基础的JavaBean
*/
public class User {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}
package utils;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;
public class JDBCUtils {
private static DataSource ds;
static {
// 配置文件 获取druid.properties 文件
InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
Properties pro = new Properties();
try {
pro.load(is);
// 初始化连接池
ds = DruidDataSourceFactory.createDataSource(pro);
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
// 获取连接池DataSource对象
public static DataSource getDataSource(){
return ds;
}
// 获取Connection对象
public static Connection getConnection() throws SQLException {
return ds.getConnection();
}
}
age dao;
import domain.User;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import utils.JDBCUtils;
public class UserDao {
// 将JDBCTemplate对象共用
private static JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
public User login(User userLogin){
try {
// 编写sql
String sql = "select * from user where username = ? and password = ?";
// 调用query方法
User user = template.queryForObject(sql,
new BeanPropertyRowMapper<User>(User.class),
userLogin.getUsername(),
userLogin.getPassword());
return user;
} catch (DataAccessException e) {
e.printStackTrace();
return null;
}
}
}
package web;
import dao.UserDao;
import domain.User;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/userDaoServlet")
public class UserDaoServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置编码
request.setCharacterEncoding("utf-8");
// 获取参数
String username = request.getParameter("username");
String password = request.getParameter("password");
// 创建User对象 传入参数
User userLogin = new User();
userLogin.setUsername(username);
userLogin.setPassword(password);
//创建UserDao对象 传入User对象
UserDao dao = new UserDao();
User user = dao.login(userLogin);
// 判断是否为空
if (user == null){
// 登录失败 跳转到登录失败也页面
request.getRequestDispatcher("/failServlet").forward(request,response);
}else {
//登录成功
// 存储数据
// 跳转到登录成功 页面
request.setAttribute("user",user);
request.getRequestDispatcher("/successServlet").forward(request,response);
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
package web;
import domain.User;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/successServlet")
public class SuccessServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置编码
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
// 获取共享资源
User user = (User) request.getAttribute("user");
// 输出登录成功语句
response.getWriter().write("登录成功！"+user.getUsername()+",欢迎您...");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
package web;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/failServlet")
public class FailServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 设置编码
response.setContentType("text/html;charset=utf-8");
// 输出登录失败页面语句
response.getWriter().write("登录失败,用户名或密码错误...");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
/*
注： 此代码为菜鸟第一次编写 如有不对之处，
请 各位大佬 不吝指出 谢谢 ！！！
*/