《Java EE Web组件开发》实验二
2024-05-09 16:34:26
[实验任务] 使用jsp页面完成注册、登录并显示
[任务介绍]
1.任务描述
网上购物是人们日常生活的重要事情之一。在超市中有很多日常生活的用品，如电饭煲、蒸锅、洗衣机、电冰箱等。
本任务要求，通过所学Servlet、JavaBean和JDBC知识读取数据库数据，以JSP页面的形式呈现数据，用于数据浏览。
备注：
1）本任务需要编写4个JSP页面、6个Servlet文件（注册、登录、显示、验证码、修改、删除）、1个JavaBean文件、1个dao文件（用于实现增删改查功能）、1个数据库连接文件；
2）本任务所需要的类文件，需要按如下图所示结构创建；
3）用户先进行注册，注册成功跳转到登录页面，输入用户名和密码进行登录；登录成功跳转到显示页面，登录不成功则需要重新登录。
2.运行结果
图1 注册页面
图2 登录界面
图3 用户列表页面
图4 修改用户页面
图5 修改成功页面
图6 数据表
[任务目标]
- 掌握Servlet和JSP运行原理；
- 掌握JavaBean、EL表达式和JSP标签库（JSTL）的使用；
- 熟练应用Servlet技术、JavaBean技术完成数据访问。
[实现思路]
- 先建立登录界面，通过调用数据库用户账号和密码，如果账号或密码正确，进入用户信息列表界面。
- 用户信息列表通过调用UserDao中的findALL方法，将对应数据库中的数据取出。
- 添加用户信息，同样调用UserDao中的insert方法，将数据插入数据库中，并跳转回用户信息界面
- 修改用户信息，调用UserDao中的update方法，修改数据库中的数据，并跳转回用户信息界面
- 删除用户信息，调用UserDao中的delete方法，删除数据库中对应的数据。
[实现代码以及运行效果]
最重要的当然是连接数据库啦~
注意：
String url = "jdbc:mysql://localhost:3306/users?useUnicode=true&characterEncoding=utf-8";
这里面users是自己建的数据库哦(⊙o⊙)
如下所示为我建的数据库users，以及数据表user
id为自动编号！！！
最后一定要导入jar包！！！（打圈圈的那个哦，这个jar包网上可以下载，如果MySQL版本比较高，可能得导入8.0.27的）
废话不多说，直接上代码！！！
✨GetDBConnection.java✨
package conn;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;public class GetDBConnection {private static Connection con;public static Connection getConnection() {try {Class.forName("com.mysql.jdbc.Driver");String url = "jdbc:mysql://localhost:3306/users?useUnicode=true&characterEncoding=utf-8";String username = "root";String password = "root";con = DriverManager.getConnection(url, username, password);} catch (Exception e) {e.printStackTrace();}return con;}public static void release(Statement stat,Connection con){if(stat!=null){try{stat.close();}catch(Exception e){e.printStackTrace();}stat=null;}if(con!=null){try{con.close();}catch(Exception e){e.printStackTrace();}con=null;}}public static void release(ResultSet rs,Statement stat,Connection con){if(rs!=null){try{rs.close();}catch(Exception e){e.printStackTrace();}rs=null;}if(stat!=null){try{stat.close();}catch(Exception e){e.printStackTrace();}stat=null;}if(con!=null){try{con.close();}catch(Exception e){e.printStackTrace();}con=null;}}
}
✨User.java✨
package javabean;public class User {private int id;private String username;private String password;private String realname;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;}public String getRealname() {return realname;}public void setRealname(String realname) {this.realname = realname;}
}
✨UserDao.java✨
package javabean;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import conn.GetDBConnection;
public class UserDao {private Connection con = null;PreparedStatement preStat = null;private ResultSet rs = null;public ArrayList<User> findAll(){ArrayList<User> list = new ArrayList<User>();String sql = "select * from user";con = GetDBConnection.getConnection();try{preStat = con.prepareStatement(sql);rs = preStat.executeQuery();while (rs.next()){User user = new User();user.setUsername(rs.getString(2));user.setPassword(rs.getString(3));user.setRealname(rs.getString(4));list.add(user);}return list;}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{GetDBConnection.release(rs, preStat, con);}return null;}//查找public User findByName(String name){User user = new User();try{con = GetDBConnection.getConnection();String sql = "select * from user where username=?";preStat = con.prepareStatement(sql);preStat.setString(1, name);rs = preStat.executeQuery();if (rs.next()){user.setUsername(rs.getString(2));user.setPassword(rs.getString(3));user.setRealname(rs.getString(4));}return user;}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{GetDBConnection.release(preStat, con);}return null;}//登录public boolean Login(String name, String pwd){try{con = GetDBConnection.getConnection();String sql = "select * from user where username=? and password=?";preStat = con.prepareStatement(sql);preStat.setString(1, name);preStat.setString(2, pwd);rs = preStat.executeQuery();if (rs.next()) return true;}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{GetDBConnection.getConnection();}return false;}//插入public boolean insert(User user){try{con = GetDBConnection.getConnection();String sql = "insert into user values(null,?,?,?)";preStat = con.prepareStatement(sql);preStat.setString(1, user.getUsername());preStat.setString(2, user.getPassword());preStat.setString(3, user.getRealname());if (preStat.executeUpdate() == 1) return true;}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{GetDBConnection.release(preStat, con);}return false;}//更新public boolean update(User user) {try{con = GetDBConnection.getConnection();String sql = "update user set password=?,realname=? where username=?";preStat = con.prepareStatement(sql);preStat.setString(1, user.getPassword());preStat.setString(2, user.getRealname());preStat.setString(3, user.getUsername());if (preStat.executeUpdate() == 1) return true;}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{GetDBConnection.release(preStat, con);}return false;}//删除public boolean delete(String name){try{con = GetDBConnection.getConnection();String sql = "delete from user where username=?";preStat = con.prepareStatement(sql);preStat.setString(1, name);if (preStat.executeUpdate() == 1) return true;}catch (Exception e) {// TODO: handle exceptione.printStackTrace();}finally{GetDBConnection.release(preStat, con);}return false;}
}
✨LoginServlet.java✨
package MyServlet;import java.io.IOException;
import java.io.PrintWriter;
import javabean.UserDao;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {public LoginServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String username = request.getParameter("username");//帐号String password = request.getParameter("password");//密码if(username != null && !username.equals("")){UserDao userdao = new UserDao();boolean falg=userdao.Login(username, password);if(falg == false){request.setAttribute("msg1", "帐号或密码输入有误,登录失败！");RequestDispatcher dispatcher = request.getRequestDispatcher("/index.jsp");dispatcher.forward(request, response);}else{//request.setAttribute("msg1", "登录成功！");request.getSession().setAttribute("userid",username);response.sendRedirect("ListUserServlet");}}}public void init() throws ServletException {// Put your code here}}
✨registerUser.java✨
package MyServlet;import java.io.IOException;
import java.io.PrintWriter;
import javabean.User;
import javabean.UserDao;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class registerUser extends HttpServlet {public registerUser() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");out.println("<HTML>");out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");out.println(" <BODY>");out.print(" This is ");out.print(this.getClass());out.println(", using the GET method");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();String username = request.getParameter("username");String password = request.getParameter("password");String realname = request.getParameter("realname");User user = new User();user.setUsername(username);user.setPassword(password);user.setRealname(realname);UserDao userDao = new UserDao();boolean flag = userDao.insert(user);if (flag){out.println("用户添加成功！");request.getRequestDispatcher("/index.jsp").forward(request, response);}else {out.println("用户添加失败！");}}public void init() throws ServletException {// Put your code here}}
✨ListUserServlet.java✨
package MyServlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javabean.User;
import javabean.UserDao;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class ListUserServlet extends HttpServlet {public ListUserServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {UserDao userDao = new UserDao();ArrayList<User> list = userDao.findAll();request.setAttribute("list", list);request.getRequestDispatcher("/UserList.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}public void init() throws ServletException {// Put your code here}}
✨addUserServlet.java✨
package MyServlet;import java.io.IOException;
import java.io.PrintWriter;
import javabean.User;
import javabean.UserDao;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class addUserServlet extends HttpServlet {public addUserServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");out.println("<HTML>");out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");out.println(" <BODY>");out.print(" This is ");out.print(this.getClass());out.println(", using the GET method");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();String username = request.getParameter("username");String password = request.getParameter("password");String realname = request.getParameter("realname");User user = new User();user.setUsername(username);user.setPassword(password);user.setRealname(realname);UserDao userDao = new UserDao();boolean flag = userDao.insert(user);if (flag){out.println("用户添加成功！");response.sendRedirect("../servlet/ListUserServlet");}else {out.println("用户添加失败！");}}public void init() throws ServletException {// Put your code here}}
✨delUserServlet.java✨
package MyServlet;import java.io.IOException;
import java.io.PrintWriter;import javabean.UserDao;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class delUserServlet extends HttpServlet {public delUserServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charste=utf-8");request.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();String username = request.getParameter("id");UserDao userDao = new UserDao();boolean flag = userDao.delete(username);if (flag){out.println("用户删除成功！");response.sendRedirect("../servlet/ListUserServlet");}else{out.println("用户删除失败！");}}public void init() throws ServletException {// Put your code here}}
✨updateUserServlet.java✨
package MyServlet;import java.io.IOException;
import java.io.PrintWriter;import javabean.User;
import javabean.UserDao;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class updateUserServlet extends HttpServlet {public updateUserServlet() {super();}public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");String username = request.getParameter("id");UserDao userDao = new UserDao();User user = new User();user = userDao.findByName(username);request.setAttribute("user", user);request.getRequestDispatcher("/updateUser.jsp").forward(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html;charset=utf-8");request.setCharacterEncoding("utf-8");PrintWriter out = response.getWriter();String username = request.getParameter("username");String password = request.getParameter("password");String realname = request.getParameter("realname");User user = new User();user.setUsername(username);user.setPassword(password);user.setRealname(realname);UserDao userDao = new UserDao();boolean flag = userDao.update(user);if (flag){out.println("用户修改成功！");response.sendRedirect("ListUserServlet");}else{out.println("用户修改失败！");}}public void init() throws ServletException {// Put your code here}}
✨jsp部分✨
小剧场~
你：在登录部分为啥没有验证码❓❗❗❗给我写出来
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