javaWeb后台版登陆注册
2016-07-19 15:50
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创建一个web项目名为bbb
1 创建数据库连接
(1)创建一个包cn.edu.hpu.util
(2)写代码
写一个使用者类
(1)创建包cn.edu.hpu.user
(2)写代码
创建管理接口和其实现类
(1)创建包cn.edu.hpu.manager
(2)写接口代码
实现接口的类
可以测试一下
(1)创建一个包cn.edu.hpu.text
(2)写代码
创建jsp
(1)创建index.jsp
创建zhuce.jsp
创建error.jsp
对index.jsp和zhuce.jsp接收一下,创建包cn.edu.hpu.selvert
(1)对index.jsp接收,创建servlet名为CheckLogin
对zhuce.jsp接收一下,创建servlet名为Register
1 创建数据库连接
(1)创建一个包cn.edu.hpu.util
(2)写代码
package cn.edu.hpu.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class DBOperate { static { try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static Connection getConnection () { Connection conn=null; try { conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/sas", "root", "123456"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return conn; } public static void close(Statement st,ResultSet rs,Connection conn) { try { if(st!=null) { st.close(); } if(rs!=null) { rs.close(); } if(conn!=null) { conn.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static void close(PreparedStatement pst,Connection conn) { try { if(pst!=null) { pst.close(); } if(conn!=null) { conn.close(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
写一个使用者类
(1)创建包cn.edu.hpu.user
(2)写代码
package cn.edu.phu.user; 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; } }
创建管理接口和其实现类
(1)创建包cn.edu.hpu.manager
(2)写接口代码
package cn.edu.hpu.manager; import cn.edu.phu.user.User; public interface Manager { public User CheckLogin(String username, String password); public boolean RegestUser(User u); }
实现接口的类
package cn.edu.hpu.manager; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import cn.edu.hpu.util.DBOperate; import cn.edu.phu.user.User; public class ManagerImpl implements Manager { public User CheckLogin(String username , String password) { User u =new User(); String sql="select * from ta"; Connection conn=null; Statement st=null; ResultSet rs=null; conn=(Connection) DBOperate.getConnection(); try { //Statement createStatement() //创建一个 Statement 对象来将 SQL 语句发送到数据库。 //编译 st=(Statement) conn.createStatement(); //从数据库里查的内容作为结果集 rs=(ResultSet) st.executeQuery(sql); //遍历这个结果集 while (rs.next()) { String name=rs.getString("username"); String psw=rs.getString("password"); if(psw.equals(password) && name.equals(username)) { u.setId(rs.getInt("id")); u.setUsername(rs.getString("username")); u.setUsername(rs.getString("password")); } } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return u; } @Override public boolean RegestUser(User u) { boolean flag=false; Connection conn=(Connection) DBOperate.getConnection(); String sql="insert into ta(username,password) value(?,?)"; try { PreparedStatement pst=conn.prepareStatement(sql); pst.setString(1, u.getUsername()); pst.setString(2, u.getPassword()); //插入之后需要更新一下 pst.executeUpdate(); flag=true; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return flag; } }
可以测试一下
(1)创建一个包cn.edu.hpu.text
(2)写代码
package cn.edu.phu.text; import java.sql.Connection; import cn.edu.hpu.manager.Manager; import cn.edu.hpu.manager.ManagerImpl; import cn.edu.hpu.util.DBOperate; import cn.edu.phu.user.User; public class Test { public static void main(String[] args) { //测试链接成功 Connection conn=DBOperate.getConnection(); if(conn!=null) { System.out.println("ok"); }else{ System.out.println("error"); } //插入信息 Manager ma=new ManagerImpl(); User us=new User(); us.setUsername("222"); us.setPassword("222"); boolean flag=ma.RegestUser(us); if(flag) { System.out.println("ok"); }else{ System.out.println("error"); } //查询信息 Manager m=new ManagerImpl(); User u=new User(); u=m.CheckLogin("123", "123"); if(!(u.getUsername().equals(null))) { System.out.println("123"); }else{ System.out.println("000"); } } }
创建jsp
(1)创建index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form action="cn.edu.hpu.servlet/CheckLogin" method = "post"> <div id = "head" align="center"> <h1>登录•</h1> </div> <div id = "body" align="center"> <table> <tr> <td>用户名</td> <td><input id = "username" name = "username"></td> </tr> <tr> <td>密码</td> <td><input type = "password" id = "password" name = "password"></td> </tr> </table> </div> <div id = "bottom" align="center"> <input type = "submit" value = "提交"> <input type = "reset" value = "重置"> <a href= "zhuce.jsp">注册</a> </div> </body> </html>
创建zhuce.jsp
<%@ page language="java" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html:html locale="true"> <head> <html:base /> <title>zhuce.jsp</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <h1 align="center">注册新用户</h1> <hr/> <form action="add" method="post" align="center"> 用户名:<input name="Username" type="text"/><br> <p></p> 密 码:<input name="Password" type="password"/><br> <p></p> 验证码:<input name="Code" type="text"></br> <p></p> <input type="submit" style="width:80px;height:35px "value="注册"/> </form> <a href="index.jsp">返回</a> </body> </html:html> (3)创建success.jsp <%@ page language="java" pageEncoding="ISO-8859-1"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html:html locale="true"> <head> <html:base /> <title>success.jsp</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <h1>lend success!</h1> </body> </html:html>
创建error.jsp
<%@ page language="java" pageEncoding="ISO-8859-1"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html:html locale="true"> <head> <html:base /> <title>error.jsp</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <h1>lend error!</h1> </body> </html:html>
对index.jsp和zhuce.jsp接收一下,创建包cn.edu.hpu.selvert
(1)对index.jsp接收,创建servlet名为CheckLogin
package cn.edu.hpu.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 cn.edu.hpu.manager.Manager; import cn.edu.hpu.manager.ManagerImpl; import cn.edu.phu.user.User; public class CheckLogin extends HttpServlet { private static final long serialVersionUID=1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //防止乱码 request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); String username=request.getParameter("username"); String password=request.getParameter("password"); //System.out.println(username+" "+password); Manager mng=new ManagerImpl(); User u=mng.CheckLogin(username, password); System.out.println(u.getUsername()); if(!u.getUsername().equals(null)) { response.sendRedirect("../success.jsp"); }else{ response.sendRedirect("../error.jsp"); } } }
对zhuce.jsp接收一下,创建servlet名为Register
package cn.edu.hpu.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 cn.edu.hpu.manager.Manager; import cn.edu.hpu.manager.ManagerImpl; import cn.edu.phu.user.User; public class Register extends HttpServlet { private static final long serialVersionUID=1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //防止乱码 request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); //这是取页面的参数用的,当页面的表单参数通过request里面传过来,就可以通过这个方法取出来 String username=request.getParameter("username"); String password=request.getParameter("password"); System.out.println(username+" "+password); Manager m=new ManagerImpl(); User u=new User(); u.setUsername(username); u.setPassword(password); boolean flag=m.RegestUser(u); if(flag) { response.sendRedirect("../success.jsp"); }else{ response.sendRedirect("../error.jsp"); } } }
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