下面是工程目录
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>登录</title> </head> <style type="text/css"> *{margin: 0;padding: 0} html,body{height: 100%} /*这里很关键*/ .outer-wrap{ /*只有同时为html和body设置height: 100%时，这里的height才生效， 并且随浏览器窗口变化始终保持和浏览器视窗等高*/ height: 100%; position: relative; background-image: url('images/01.jpg'); } .login-panel{ 400px; height: 200px; background-image: url('images/02.jpg'); position: absolute; top: 50%; left: 50%; margin-top: -150px; margin-left: -200px; } </style> <body> <% request.setCharacterEncoding("utf-8"); String message=(String)request.getAttribute("message"); if(message!=null){ if(message.equals("error")){ %> <script type="text/javascript"> alert("用户名或密码错误"); </script> <% }else if(message.equals("noerror")){ %> <script type="text/javascript"> alert("登录成功"); </script> <% }else{ } } %> <div class="outer-wrap"> <div style="font-size:160px;text-align:center">家庭记账本</div> <div class="login-panel"> <div style="font-size:40px;text-align:center">登陆界面</div> <form action="LoginServlet" method="post" > 用户名<input type="text" style="300px;height:30px;text-align:center" name="uname"><br/> 密   码<input style="300px;height:30px;text-align:center"type="password" name="upwd"><br/> <div style="text-align:center"> <input type="submit" value="登录"><br/></div> <div style="text-align:center"> <a href="register.jsp" >没有账号，立即去注册</a> </div> </form> </div> </div> </body> </html>
register.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>注册</title> </head> <% request.setCharacterEncoding("utf-8"); String message=(String)request.getAttribute("message"); if(message!=null){ if(message.equals("error")){ %> <script type="text/javascript"> alert("该用户名已被使用，请重试"); </script> <% }else if(message.equals("noerror")){ %> <script type="text/javascript"> alert("注册成功"); </script> <% }else{ } } %> <style type="text/css"> *{margin: 0;padding: 0} html,body{height: 100%} /*这里很关键*/ .outer-wrap{ /*只有同时为html和body设置height: 100%时，这里的height才生效， 并且随浏览器窗口变化始终保持和浏览器视窗等高*/ height: 100%; position: relative; background-image: url('images/01.jpg'); } .register-panel{ 400px; height: 250px; background-image: url('images/03.jpg'); position: absolute; top: 50%; left: 50%; margin-top: -150px; margin-left: -200px; } </style> <body> <div class="outer-wrap"> <div style="font-size:160px;text-align:center">家庭记账本</div> <div class="register-panel"> <div style="font-size:40px;text-align:center">注册界面</div> <form action="RegisterServlet" method="post"> <div style="text-align:center"> 用户名<input type="text" style="300px;height:30px;text-align:center" name="uname"><br/> </div> <div style="text-align:center"> 密   码<input type="text" style="300px;height:30px;text-align:center" name="upwd"><br/> </div> <div style="text-align:center"> <input type="radio" name="usex" checked="checked">男 <input type="radio" name="usex">女 </div> <div style="text-align:center"> <input type="submit" value="注册"><br/></div> <div style="text-align:center"> <a href="login.jsp" >已有账号，立即去登录</a> </div> </form> </div> </div> </body> </html>
index.jsp
<%@ 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"); String message=(String)request.getAttribute("message"); if(message!=null){ if(message.equals("error")){ %> <script type="text/javascript"> alert("用户名或密码错误"); </script> <% }else if(message.equals("noerror")){ %> <script type="text/javascript"> alert("登录成功"); </script> <% }else{ } } %> 登录成功 </body> </html>
DBUtil.java
package com.zzw.utils; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; public class DBUtil { //数据库URL和账号密码 private static final String URL="jdbc:mysql://localhost:3306/bookkeeping?serverTimezone=UTC&characterEncoding=utf-8"; private static final String UNAME="root"; private static final String UPWD="vayne"; public static PreparedStatement pstmt=null; public static ResultSet rs = null; public static Connection connection=null; //增删改 public static boolean executeUpdate(String sql,Object [] params) { boolean flag = false; try { //a.导入驱动，加载具体的驱动类 Class.forName("com.mysql.cj.jdbc.Driver"); //b.与数据库建立连接 connection = DriverManager.getConnection(URL,UNAME,UPWD); pstmt = connection.prepareStatement(sql); for(int i=0;i<params.length;i++) { pstmt.setObject(i+1, params[i]); } int count=pstmt.executeUpdate();//返回值表示，增删改几条数据 //处理结果 if(count>0) { System.out.println("操作成功！！！"); } }catch(ClassNotFoundException e) { e.printStackTrace(); }catch(SQLException e) { e.printStackTrace(); }catch(Exception e){ e.printStackTrace(); }finally { try { //先开的后关，后开的先关 if(pstmt!=null)pstmt.close(); if(connection !=null)connection.close(); }catch(SQLException e) { e.printStackTrace(); }finally { } } return flag; } //查 public static ResultSet executeQuery(String sql,Object [] params) { try { //a.导入驱动，加载具体的驱动类 Class.forName("com.mysql.cj.jdbc.Driver"); //b.与数据库建立连接 connection = DriverManager.getConnection(URL,UNAME,UPWD); pstmt = connection.prepareStatement(sql); if(params!=null) { for(int i=0;i<params.length;i++) { pstmt.setObject(i+1, params[i]); } } rs = pstmt.executeQuery(); return rs; }catch(ClassNotFoundException e) { e.printStackTrace(); return null; }catch(SQLException e) { e.printStackTrace(); return null; }catch(Exception e){ e.printStackTrace(); return null; } } }
LoginServlet.java
package com.zzw.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.zzw.entity.User; import com.zzw.service.IUserService; import com.zzw.service.Impl.UserServiceImpl; public class LoginServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html; charset=utf-8"); String name= request.getParameter("uname"); String pwd= request.getParameter("upwd"); User user = new User(name,pwd); //接口 x=new 实现类（） IUserService userservice = new UserServiceImpl(); boolean result=userservice.Login(user); if(!result) { request.setAttribute("message","error"); request.getRequestDispatcher("login.jsp").forward(request, response); }else { request.setAttribute("message","noerror"); request.getRequestDispatcher("index.jsp").forward(request, response); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
Register.java
package com.zzw.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.zzw.entity.User; import com.zzw.service.IUserService; import com.zzw.service.Impl.UserServiceImpl; public class RegisterServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html; charset=utf-8"); String name= request.getParameter("uname"); String pwd= request.getParameter("upwd"); String sex= request.getParameter("usex"); User user = new User(name,pwd,sex); //接口 x=new 实现类（） IUserService userservice = new UserServiceImpl(); boolean result=userservice.Register(user); if(!result) { request.setAttribute("message","error"); request.getRequestDispatcher("register.jsp").forward(request, response); }else { request.setAttribute("message","noerror"); request.getRequestDispatcher("register.jsp").forward(request, response); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
UserServiceImpl.java
package com.zzw.service.Impl; import com.zzw.dao.IUserDao; import com.zzw.dao.Impl.UserDaoImpl; import com.zzw.entity.User; import com.zzw.service.IUserService; public class UserServiceImpl implements IUserService{ IUserDao userdao= new UserDaoImpl(); //登录 public boolean Login(User user) { boolean flag=false; if(userdao.Login(user.getUname(),user.getUpwd())) { flag=true; } return flag; } //注册 public boolean Register(User user) { boolean flag=false; if(!userdao.isExist(user.getUname())) { userdao.Register(user); flag=true; }else { System.out.println("此人已存在"); } return flag; } //根据账号查询用户 public User Query(String uname) { return userdao.Query(uname); } }
IUserService.java
package com.zzw.service; import com.zzw.entity.User; public interface IUserService { //登录 public boolean Login(User user); //注册 public boolean Register(User user) ; //根据账号查询用户 public User Query(String uname) ; }
User.java
package com.zzw.entity; public class User { private int uid; private String uname; private String upwd; private String usex; @Override public String toString() { return "User [uid=" + uid + ", uname=" + uname + ", upwd=" + upwd + ", usex=" + usex + "]"; } public User() { } public User( String uname, String upwd) { this.uname = uname; this.upwd = upwd; } public User( String uname, String upwd, String usex) { this.uname = uname; this.upwd = upwd; this.usex = usex; } public User(int uid, String uname, String upwd, String usex) { this.uid = uid; this.uname = uname; this.upwd = upwd; this.usex = usex; } public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getUpwd() { return upwd; } public void setUpwd(String upwd) { this.upwd = upwd; } public String getUsex() { return usex; } public void setUsex(String usex) { this.usex = usex; } }
UserDaoImpl.java
package com.zzw.dao.Impl; import java.sql.ResultSet; import java.sql.SQLException; import com.zzw.dao.IUserDao; import com.zzw.entity.User; import com.zzw.utils.DBUtil; public class UserDaoImpl implements IUserDao{ //注册 public boolean Register(User user) { String sql="insert into user(uname,upwd,usex) values(?,?,?)" ; Object [] params= {user.getUname(),user.getUpwd(),user.getUsex()}; return DBUtil.executeUpdate(sql, params); } //查询账户是否存在 public boolean isExist(String uname) { return Query(uname)==null? false:true; } //登录 public boolean Login(String uname,String upwd) { return Query(uname,upwd)==null? false:true; } //根据账号查询用户全部信息 public User Query(String uname) { User user= null; ResultSet rs = null; try { String sql="select * from user where uname =?" ; Object [] params= {uname}; rs=DBUtil.executeQuery(sql, params); if(rs.next()) { String name=rs.getString("uname"); String pwd=rs.getString("upwd"); String sex=rs.getString("usex"); user= new User(name,pwd,sex); } }catch(SQLException e) { e.printStackTrace(); }catch(Exception e) { e.printStackTrace(); }finally { try { //先开的后关，后开的先关 if(rs!=null)rs.close(); if(DBUtil.pstmt!=null)DBUtil.pstmt.close(); if(DBUtil.connection !=null)DBUtil.connection.close(); }catch(SQLException e) { e.printStackTrace(); }finally { } } return user; } //根据账户密码确定是否存在 public User Query(String uname,String upwd) { User user= null; ResultSet rs = null; try { String sql="select * from user where uname =? and upwd=?" ; Object [] params= {uname,upwd}; rs=DBUtil.executeQuery(sql, params); if(rs.next()) { String name=rs.getString("uname"); String pwd=rs.getString("upwd"); String sex=rs.getString("usex"); user= new User(name,pwd,sex); } }catch(SQLException e) { e.printStackTrace(); }catch(Exception e) { e.printStackTrace(); }finally { try { //先开的后关，后开的先关 if(rs!=null)rs.close(); if(DBUtil.pstmt!=null)DBUtil.pstmt.close(); if(DBUtil.connection !=null)DBUtil.connection.close(); }catch(SQLException e) { e.printStackTrace(); }finally { } } return user; } }
IUserDao.java
package com.zzw.dao; import com.zzw.entity.User; public interface IUserDao { //注册 public boolean Register(User user) ; //查询账户是否存在 public boolean isExist(String uname) ; //登录 public boolean Login(String uname,String upwd) ; //根据帐号查询用户全部信息 public User Query(String uname) ; }
此时无用户，登录失败
去注册
输入错误的密码
