javaweb 登录注册
1：用户登录界面 login.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 'login.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> <center> <form name="myform" method="post" action="/webDemo2/LoginServlet"> 用户名字： <input type="text" name="username"/><br/><br/> 用户密码：<input type="text" name="userpwd"/><br/><br/> <input type="submit" value="登录"/> <a href="/webDemo2/registerStudent.html">点击注册用户</a> </form> </center> </body> </html>
1.1：点击登录，表单信息提交到LoginServlet
package com.neusoft.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.SQLException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.neusoft.dao.StudentDAO; import com.neusoft.dao.StudentPO; public class LoginServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); String username=request.getParameter("username"); String userpwd=request.getParameter("userpwd"); StudentDAO sd = new StudentDAO(); try { StudentPO sp=sd.doLogin(username, userpwd); if(sp==null){ response.sendRedirect("/webDemo2/login.jsp"); }else{ request.setAttribute("student", sp); if(sp.getUserPower()==1) request.getRequestDispatcher("/main.jsp").forward(request, response); else if(sp.getUserPower()==0) request.getRequestDispatcher("/user.jsp").forward(request, response); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
Power为1代表管理员，Power为2代表用户
分别跳转到main.jsp,user.jsp
1.1.1:管理员登录
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@page import="com.neusoft.dao.StudentPO"%> <% //java脚本 //写java的代码 String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <% StudentPO stu=(StudentPO)request.getAttribute("student"); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'main.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> <!-- java表达式 --> 当前网站的根目录：<%=path %><BR/> 当前网站的全目录：<%=basePath %><br/> 欢迎<%=stu.getUserName() %>登录！！！<BR/> <a href="/webDemo2/QueryAllStudent">查看所有人员</a> </body> </html>
跳转到QueryAllAtudent方法中：
package com.neusoft.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.SQLException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.neusoft.dao.StudentDAO; import com.neusoft.dao.StudentPO; public class QueryAllStudent extends HttpServlet { /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { StudentDAO sd = new StudentDAO(); try { List<StudentPO> list=sd.queryAllStudent(); request.setAttribute("students", list); request.getRequestDispatcher("/showStudents.jsp").forward(request, response); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
创建数据库对象，将数据库中信息放到集合中，封装对象，提交到showStudents.jsp中
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@page import="com.neusoft.dao.StudentPO"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <% List<StudentPO> list=(List<StudentPO>)request.getAttribute("students"); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'showStudents.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> <table border="1" bordercolor="red" align="center"> <tr> <th>用户ID</th> <th>真实姓名</th> <th>用户姓名</th> <th>用户年龄</th> <th>用户权限</th> </tr> <% for(StudentPO s :list){ %> <tr> <td><%=s.getUserId() %></td> <td><%=s.getRealName() %>></td> <td><%=s.getUserName() %></td> <td><%=s.getUserAge() %></td> <td><%=s.getUserPower() %></td> </tr> <% } %> </table> </body> </html>
1.1.2：企业员工登录
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@page import="com.neusoft.dao.StudentPO"%> <% //java脚本 //写java的代码 String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <% StudentPO stu=(StudentPO)request.getAttribute("student"); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'main.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> <!-- java表达式 --> 当前网站的根目录：<%=path %><BR/> 当前网站的全目录：<%=basePath %><br/> 欢迎<%=stu.getUserName() %>登录！！！<BR/> <a href="/webDemo2/QueryOnlyOne?userid=<%=stu.getUserId() %>">查看自己信息</a> </body> </html>
向QueryOnlyOne 提交userid 的信息，为了调用StudentDAO下面的public List<StudentPO> queryStudentById(int id)方法，查询出当前登录用户
package com.neusoft.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.SQLException; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.neusoft.dao.StudentDAO; import com.neusoft.dao.StudentPO; public class QueryOnlyOne extends HttpServlet { /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { StudentDAO sd = new StudentDAO(); StudentPO sp = new StudentPO(); String id=request.getParameter("userid"); int userid = Integer.parseInt(id); try { //将对象保存在请求对象中 List<StudentPO> list=sd.queryStudentById(userid); request.setAttribute("students", list); request.getRequestDispatcher("/showStudents.jsp").forward(request, response); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
跳转到showStudents.jsp中
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@page import="com.neusoft.dao.StudentPO"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <% List<StudentPO> list=(List<StudentPO>)request.getAttribute("students"); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'showStudents.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> <table border="1" bordercolor="red" align="center"> <tr> <th>用户ID</th> <th>真实姓名</th> <th>用户姓名</th> <th>用户年龄</th> <th>用户权限</th> </tr> <% for(StudentPO s :list){ %> <tr> <td><%=s.getUserId() %></td> <td><%=s.getRealName() %>></td> <td><%=s.getUserName() %></td> <td><%=s.getUserAge() %></td> <td><%=s.getUserPower() %></td> </tr> <% } %> </table> </body> </html>
1.2:注册用户
1.2.1registerStudent.html界面
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>registerStudent.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <center> <form name="myform" method="post" action="/webDemo2/RegisterServlet"> 用户ID ： <input type="text" name="userid"><br/> 用户姓名：<input type="text" name="username"/><br/> 真实姓名：<input type="text" name="realname"><br/> 用户密码：<input type="text" name="userpwd"><br/> 用户年龄：<input type="text" name="userage"><br/> <input type="radio" name="power" value="0" checked>员工 <input type="radio" name="power" value="1" checked="true">管理员<br/> <input type="submit" value="注册"/> </form> </center> </body> </html>
1.2.2跳转到RegisterServlet.java中
package com.neusoft.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.SQLException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.neusoft.dao.StudentDAO; public class RegisterServlet extends HttpServlet{ /* * HttpServlet中有两个方法需要我们自己重写 * 需要在web.xml文件中进行注册 */ @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("utf-8"); resp.setCharacterEncoding("utf-8"); //1.接受客户端数据 //按照客户端调教数据的name-value的形式来提取数据 String userid=req.getParameter("userid"); String username = req.getParameter("username"); String realname=req.getParameter("realname"); String userpwd=req.getParameter("userpwd"); String userage=req.getParameter("userage"); String userpower=req.getParameter("power"); int id = Integer.parseInt(userid); int age = Integer.parseInt(userage); int power=Integer.parseInt(userpower); //2.使用JDBC，将数据添加到数据库中 StudentDAO sd = new StudentDAO(); //3.HttpServletResponse对象 //将HTML代码以数据流的形式响应给客户端 //客户端使用IE浏览器来解析响应的HTML数据流 //获得一个输出流对象 // PrintWriter out = resp.getWriter(); // // out.println("<html>"); // out.println("<head>"); // out.println("<meta http-equiv='content-type' content='text/html; charset=UTF-8'>"); // out.println("</head>"); // out.println("<body>"); try { int result=sd.add(id,username,userpwd,age,realname,power); if(result>0){ //1.站内跳转,请求转发 //只能转发网站内部的资源 //转发的是同一个请求和响应对象 req.getRequestDispatcher("/login.jsp").forward(req, resp); //2.重定向跳转 //可以请求外部资源 //由于是客户端重新发起的请求，所以请求和响应对象不是同一个 //resp.sendRedirect("/webDemo/success.jsp"); //out.println("添加成功"); }else{ //out.println("添加失败"); } } catch (SQLException e) { //out.println("添加失败"); } } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } }
注册成功，重新跳回login.jsp
2.1数据库代码
package com.neusoft.dao; 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 StudentDAO { //链接数据库 public Connection getConnection(){ Connection conn = null; String driverName="com.mysql.jdbc.Driver"; String connectionString="jdbc:mysql://localhost:3306/test?"+"user=root&password=123456&useUnicode=true&characterEncoding=utf-8"; try{ Class.forName(driverName); conn=DriverManager.getConnection(connectionString); //conn.close(); }catch(ClassNotFoundException e){ e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return conn; } //用户登录 public StudentPO doLogin(String username,String userpwd) throws SQLException{ String sql="select * from test where loginname=? and loginpwd=?"; Connection conn = getConnection(); PreparedStatement ps = null; //向数据库中发送数据集 ResultSet rs = null; //接受返回的数据集对象 StudentPO sp = null; //将传回的行封装为列对象 try { ps=conn.prepareStatement(sql); ps.setString(1, username); ps.setString(2, userpwd); rs = ps.executeQuery(); //遍历结果集，将数据封装到集合中 while(rs.next()){ sp = new StudentPO(); sp.setUserName(rs.getString("loginname"));/*********/ sp.setUserPwd(rs.getString("loginpwd")); sp.setuserPower(rs.getInt("power")); sp.setUserId(rs.getInt("id")); sp.setRealName(rs.getString("name")); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ rs.close(); ps.close(); conn.close(); } return sp; } public int executeNonQuery(String sql,Object[]args) throws SQLException{ Connection conn = getConnection(); PreparedStatement ps=null; int result=0; try { ps = conn.prepareStatement(sql); if(args!=null){ for(int i=0;i<args.length;i++){ ps.setObject(i+1, args[i]); } } result=ps.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ ps.close(); conn.close(); } return result; } //用户注册 public int add(int id,String name,String loginpwd,int userage,String realname,int userpower) throws SQLException{ String sql="insert into test(id,loginname,loginpwd,age,name,power)" +"values(?,?,?,?,?,?)"; Object[] args={id,name,loginpwd,userage,realname,userpower}; int result=executeNonQuery(sql, args); return result; } //刷新用户(在哪调用) public int update(int id,String name,String loginpwd,int age) throws SQLException{ String sql="update test set loginname=? ,loginpwd=? ,age=?" +" where id=?"; Object[] args={name,loginpwd,id,age}; int result = executeNonQuery(sql, args); return result; } //删除用户信息 public int delete(int id) throws SQLException{ String sql="delete from test where id="+id; int result=executeNonQuery(sql, null); return result; } //封装数据集 public List<StudentPO> queryAllStudent() throws SQLException{ String sql="select * from test"; Connection conn = getConnection(); PreparedStatement ps = null; ResultSet rs = null; List<StudentPO> list = new ArrayList<StudentPO>(); try { ps=conn.prepareStatement(sql); rs = ps.executeQuery(); //遍历结果集，将数据封装到集合中 while(rs.next()){ int userid=rs.getInt("id");//*********** int userage=rs.getInt("age"); int userpower=rs.getInt("power"); String username = rs.getString("loginname"); String userpwd = rs.getString("loginpwd"); String realname=rs.getString("name"); StudentPO sp = new StudentPO(); sp.setUserId(userid); sp.setUserName(username); sp.setRealName(realname); sp.setUserPwd(userpwd); sp.setUserAge(userage); sp.setuserPower(userpower); list.add(sp); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ rs.close(); ps.close(); conn.close(); } return list; } //注册检索 public List<StudentPO> queryStudentById(int id) throws SQLException{ String sql="select * from test where id="+id; Connection conn = getConnection(); PreparedStatement ps = null; ResultSet rs = null; List<StudentPO> list = new ArrayList<StudentPO>(); try { ps=conn.prepareStatement(sql); rs = ps.executeQuery(); //遍历结果集，将数据封装到集合中 while(rs.next()){ int userid=rs.getInt("id");//**************/ int userage=rs.getInt("age"); int userpower=rs.getInt("power"); String username = rs.getString("loginname"); String userpwd = rs.getString("loginpwd"); String realname=rs.getString("name"); StudentPO sp = new StudentPO(); sp.setUserId(userid); sp.setUserName(username); sp.setUserPwd(userpwd); sp.setUserAge(userage); sp.setRealName(realname); sp.setuserPower(userpower); list.add(sp); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ rs.close(); ps.close(); conn.close(); } return list; } }
package com.neusoft.dao; import java.util.List; public class StudentPO { private int userId; private String userName; private int userAge; private String userPwd; private String realName; private int userPower; public int getUserPower(){ return userPower; } public void setuserPower(int userpower) { this.userPower = userpower; } public String getRealName(){ return realName; } public void setRealName(String realname) { this.realName = realname; } public String getUserPwd() { return userPwd; } public void setUserPwd(String userpwd) { this.userPwd = userpwd; } public int getUserId() { return userId; } public void setUserId(int userId) { this.userId = userId; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public int getUserAge() { return userAge; } public void setUserAge(int userAge) { this.userAge = userAge; } }
3.1配置文件
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>RegisterServlet</servlet-name> <servlet-class>com.neusoft.servlet.RegisterServlet</servlet-class> </servlet> <servlet> <servlet-name>QueryOnlyOne</servlet-name> <servlet-class>com.neusoft.servlet.QueryOnlyOne</servlet-class> </servlet> <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.neusoft.servlet.LoginServlet</servlet-class> </servlet> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>QueryAllStudent</servlet-name> <servlet-class>com.neusoft.servlet.QueryAllStudent</servlet-class> </servlet> <servlet-mapping> <servlet-name>QueryOnlyOne</servlet-name> <url-pattern>/QueryOnlyOne</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>RegisterServlet</servlet-name> <url-pattern>/RegisterServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/LoginServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>QueryAllStudent</servlet-name> <url-pattern>/QueryAllStudent</url-pattern> </servlet-mapping> </web-app>
