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JSP登陆界面

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用Jsp做的一个简单的登陆界面，连接Mysql，数据库名字为school，表为user。

主要分为四个Jsp界面：index.jsp登陆界面，check.jsp检验页面，main.jsp登陆成功界面，error.jsp登陆失败界面。

如下所示：<%@page language="java"import="java.util.*" pageEncoding="utf-8"%><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>登陆界面</title></head><body><br><br><br><br><br><br><br><br><center><form action="check.jsp"method="post"><table width="380"border="2"bgcolor="#95BDFF"><tr><td><br><h1>&nbsp &nbsp &nbsp 欢迎光临，请登陆</h1></td></tr><tr><td><br>&nbsp &nbsp &nbsp &nbsp 用户名字: &nbsp<input name="username"type="text" size="28"><br><br>&nbsp &nbsp &nbsp &nbsp 用户密码 : &nbsp<input name="userpass"type="password" size="29"><br><br>&nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp &nbsp<input type="submit"name="submit"value="提交"style="height:30px;width:80px">&nbsp &nbsp &nbsp &nbsp &nbsp &nbsp<input type="reset"name="reset"value="取消"style="height:30px;width:80px"><br>&nbsp</td></tr></table></form></center></body></html><%@page language="java"import="java.sql.*" pageEncoding="utf-8"%><html><head><meta http-equiv="Content-Type" content="text/html;UTF-8"><title>登陆界面</title></head><body><%String username = new String(request.getParameter("username").getBytes("ISO-8859-1") ,"utf-8");String password = new String(request.getParameter("userpass").getBytes("ISO-8859-1") ,"utf-8");session.setAttribute("name",username);Connection dbconn = null;Statement stmt = null;ResultSet rs = null;if(username.equals("")){response.sendRedirect("index.jsp");}try{String driver = "com.mysql.jdbc.Driver";String url = "jdbc:mysql://localhost:3306/school";String user = "sa";String Password = "123";Class.forName(driver);dbconn = DriverManager.getConnection(url, user, Password);stmt = dbconn.createStatement();String sql1 = "select * from user where username='"+username+"'";rs = stmt.executeQuery(sql1);if(rs.next()){//String sql2 = "select * from user where password='"+password+"'";//rs = stmt.executeQuery(sql2);//判断用户密码是否正确String userpass = rs.getString("password");if(userpass.equals(password)){response.sendRedirect("main.jsp");}else{response.sendRedirect("error.jsp");}}else{response.sendRedirect("error.jsp");}}catch(Exception e){e.printStackTrace();}finally{rs.close();stmt.close();dbconn.close();}%></body></html><%@page language="java"import="java.util.*" import="java.text.*"pageEncoding="utf-8"%><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>登陆成功界面</title></head><body><h1>登陆成功，<%=session.getAttribute("name")%>欢迎您！</h1><%Date now = new Date();DateFormat mediumDateFormat = DateFormat.getDateTimeInstance( DateFormat.MEDIUM, DateFormat.MEDIUM);%><h2>&nbsp &nbsp &nbsp &nbsp<%out.println(mediumDateFormat.format(now));%></h2> </body></html><%@page language="java"import="java.util.*" pageEncoding="utf-8"%><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>登陆失败界面</title></head><body><h1>登陆失败，您输入的用户名或者密码不正确！</h1></body></html>。

合集下载

(完整版)JSP登陆页面代码

(完整版)JSP登陆页面代码

response.sendRedirect("login.htm");
}
%>
如果输入信息有误，则回到登录页面，重新输入登录信息。
注册页面：reg.jsp
请输入您的注册信息：
<table>
<form action="/user/Reg" method="post" name="regform" onsubmit="return regconfirm();">
session.setAttribute("login","ok");
session.setMaxInactiveInterval(-1);
%>
<jsp:forward page="main.jsp"/>
<%
}else{
out.println("用户名或密码输入错误！");
}
%>
如果登录成功，则设定login的值为ok，提交到下一步验证页面，则进入main.jsp页面，否则，如果输入的用户名和密码不合法就打印错误信息，main.jsp页面代码如下：
<tr><td>密码：</td><td><input type="password" name="user_pwd" id="user_pwd" size="20" maxlength=10 onBlur="checkPWD();">*可以包含字母数字(区分大小写)，6-10位</td>
Jsp学生信息管理系统登录验证全代码

Jsp学生信息管理系统登录验证全代码

1.jsp登录界面Login.jsp<%page language="java"contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><html><head><meta http-equiv="Content-Type"content="text/html; charset=UTF-8"><title>用户登录界面</title></head><form action="LoginServlet"method="post"><body bgcolor="blue"><marquee direction="right"onmouseover="stop()" onmouseout="start()"style="font-family: 楷体_GB2312"><p><font size="10px"color="red">学生信息信息管理系统</font></p></marquee><table align=center width="237"><tr><td><table width=100%><tr><td colspan=6><font size=2><div id="b2bContent"style="FILTER: revealTrans(Duration = 1, Transition = 23); WIDTH: 100%; HEIGHT: 162px"></div></font></td></tr><tr><td align=center STYLE='cursor: hand'><font size=2><div class="b2bbutton"id="bt0"onclick="javascript:showPage(0);clearTimeout(theT imer);theTimer=setTimeout('turnPage()',speed);check Bt();">1</div></font></td><td align=center STYLE='cursor: hand'><font size=2><div class="b2bbutton"id="bt1"onclick="javascript:showPage(1);clearTimeout(theT imer);theTimer=setTimeout('turnPage()',speed);checkBt();">2</div></font></td><td align=center STYLE='cursor: hand'><font size=2><div class="b2bbutton"id="bt2"onclick="javascript:showPage(2);clearTimeout(theT imer);theTimer=setTimeout('turnPage()',speed);check Bt();">3</div></font></td><td align=center STYLE='cursor: hand'><font size=2><div class="b2bbutton"id="bt3"onclick="javascript:showPage(3);clearTimeout(theT imer);theTimer=setTimeout('turnPage()',speed);check Bt();">4</div></font></td><td align=center STYLE='cursor: hand'><font size=2><div class="b2bbutton"id="bt4"onclick="javascript:showPage(4);clearTimeout(theT imer);theTimer=setTimeout('turnPage()',speed);check Bt();">5</div></font></td><td align=center STYLE='cursor: hand'><font size=2><div class="b2bbutton"id="bt5"onclick="javascript:showPage(5);clearTimeout(theT imer);theTimer=setTimeout('turnPage()',speed);check Bt();">6</div></font></td></tr></table><script language="javascript">b2bStr = new Array();b2bStr[0]= "<div style='float:left; width:100%;overflow:hidden;'><a href=1.gif target=_blank><img src=1.gif width=214px height=145px border=0></a><br><a target=_blank title=太阳岛公园一角href=1.gif>太阳岛公园一角</a></div>";width:100%;overflow:hidden;'><a href=2.gif target=_blank><img src=2.gif width=214px height=145px border=0></a><br><a target=_blank title=太阳岛公园湖光山色href=2.gif>太阳岛公园湖光山色</a></div>";b2bStr[2] = "<div style='float:left; width:100%;overflow:hidden;'><a href=3.gif target=_blank><img src=3.gif width=214px height=145px border=0></a><br><a target=_blank title=雪雕href=3.gif>雪雕</a></div>";b2bStr[3] = "<div style='float:left; width:100%;overflow:hidden;'><a href=4.gif target=_blank><img src=4.gif width=214px height=145px border=0></a><br><a target=_blank title=镜泊湖href=4.gif>镜泊湖</a></div>";b2bStr[4] = "<div style='float:left; width:100%;overflow:hidden;'><a href=5.gif target=_blank><img src=5.gif width=214px height=145px border=0></a><br><a target=_blank title=太阳岛公园瀑布href=5.gif>太阳岛公园瀑布</a></div>";width:100%;overflow:hidden;'><a href=6.gif target=_blank><img src=6.gif width=214px height=145px border=0></a><br><a target=_blank title=镜泊湖夜色href=6.gif>镜泊湖夜色</a></div>";var page=0;var speed=3000;function showPage(id){page=id;setTransition();b2bContent.innerHTML=b2bStr[id];b2bContent.filters.revealTrans.play();}function turnPage(){showPage(page);theTimer=setTimeout("turnPage()", speed);checkBt();page++;if(page>=6) page=0;}function checkBt(){for(var i=0;i<6;i++){btObj=eval('bt'+i);if(page==i){btObj.style.color='#FFFFFF';btObj.styl e.backgroundColor='#FF781C';}else{btObj.style.color='#000000';btObj.style.backg roundColor='#F7F7F7';}}}function setTransition(){b2bContent.filters.revealTrans.Transition=Math.rou nd(Math.random()*23);b2bContent.filters.revealTrans.apply();}turnPage();</script></TD></TR></table><hr color="green"width="540"><table align="center"><tr><td>用户名:<input type="text" name="username"size="8"maxlength="6"></td> </tr><tr><td>密&nbsp;&nbsp;&nbsp;&nbsp;码:<input type="password"name="password"size="10" maxlength="6"></td></tr><tr><td><input type="submit"value="登录">&nbsp;&nbsp;&nbsp;&nbsp;<input type="reset"value="取消"></td></tr></table></form></body></html>2.java代码(1)User.Java 定义的属性和数据库中的字段相对应package .softeem.dt;public class User {private int id;private String username;private String password;private String xh;private String college;public int getId(){return id;}public void setId(int id){this.id = id;}public String getUsername() {return username;}public void setUsername(String username) { ername = username;}public String getPassword() {return password;}public void setPassword(String password) { this.password = password;}public String getXh() {return xh;}public void setXh(String xh) {this.xh = xh;}public String getCollege() {return college;}public void setCollege(String college) { this.college = college;}}(2)UserDAO.java 操作数据库tb_user,验证用户登录package .softeem.dao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import .softeem.db.DBManager;import er;public class UserDAO {/***验证用户登录*return*/public boolean checkDenglu(User user) {boolean flag = false;// 获得数据库连接Connection conn = DBManager.getConnection();// 用select * from查询数据库中的所有字段String sql = "select count(*) from tb_user where username=? and password=?";try {PreparedStatement pst = conn.prepareStatement(sql);pst.setString(1, user.getUsername());pst.setString(2, user.getPassword());// 执行查询语句,拿到结果集ResultSet rs = pst.executeQuery();while (rs.next()) {int count = rs.getInt(1);//用count和0比较,若大于0表示该用户存在,否则不存在if(count > 0){flag = true;}}} catch (SQLException e) {e.printStackTrace();}return flag;}}3.LoginServlet,点击登录跳转到服务器端package .softeem.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 erDAO;import er;/*** Servlet implementation class LoginServlet*/public class LoginServlet extends HttpServlet { private static final long serialVersionUID = 1L;/*** see HttpServlet#HttpServlet()*/public LoginServlet() {super();}/*** see HttpServlet#doGet(HttpServletRequestrequest, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {super.doGet(request, response);}/*** see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//获取表单数据//处理乱码request.setCharacterEncoding("utf-8");String username = request.getParameter("username");String password = request.getParameter("password");//封装到user对象中User user = new User();user.setUsername(username);user.setPassword(password);//调用dao的checkLogin方法UserDAO dao = new UserDAO();boolean flag = dao.checkLogin(user);String message = null;String path = null;if(flag){message = "登录成功";path="success.jsp";request.getSession().setAttribute("user", user);}else{message ="对不起密码错误,请重新输入!";path="fail.jsp";}//response返回messageresponse.setCharacterEncoding("utf-8");response.getWriter().write(message);*///属于服务器跳转,浏览器地址栏没有发生改变request.getRequestDispatcher(path).forward(reque st,response);}}。

jsp编写登录界面

jsp编写登录界面

/blog/20091213/77.html按以下要求建立用户帐号信息表：用户ID：字符型，最大长度20用户姓名：字符型，最大长度20用户密码：字符型，最大长度20编写用户登陆页面。

当用户输入正确的用户ID及密码后迁移到“登录成功”提示页面。

否则用户重新进行登录。

11111 张三11111122222 李四22222233333 张五333333编写这个project时主要遇到了一个jsp页面的url传值问题，其次就是一些逻辑处理的问题url传参的String n = request.getParameter(“wrongid”);if(n == “wrongid1″)判断不了。

请教了某个高手后才知道java的字符串是不能这样判断的，要用n.equals()方法。

java中字符串的存储方法不一样，不是基本数据类型。

至此三个实验全部完成了，发现java还是挺有意思的，我很想学java啊……..可惜最近忙的要死，都抽不出时间看书。

我这人最大的杯具就是对什么都感兴趣，什么都懂一点，但是什么都不精通……..附上核心代码和工程压缩包下载：index.jsp<form id="form" action="login.jsp" method="post"><label>用户ID:<input id="username" name="username" size="15" type="text" /></label><label>密码:<input id="password" name="password" size="15" type="password" /></label><label><input type="submit" value="登陆" /></label></form>login.jspString userid = request.getParameter("username");String password = request.getParameter("password");if( userid ==""|| userid ==null|| userid.length()&gt;20|| password =="" || password ==null|| password.length()&gt;20){try{response.sendRedirect("wrong.jsp?wrongid=1");}catch(Exception e ){}}else{Connection conn =null;Statement stmt =null;ResultSet rs =null;try{Class.forName("com.mysql.jdbc.Driver").newInstance();conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/member?user=root&amp ;password=root&amp;useUnicode=true&amp;characterEncoding=utf-8");stmt = conn.createStatement();String sql="SELECT name FROM member where id="+userid+" and pw="+password;if(stmt.execute(sql)){rs = stmt.getResultSet();while(rs.next()){out.println("登陆成功！");out.println("欢迎您："+rs.getString("name"));}}conn.close();}catch(SQLException ex){response.sendRedirect("wrong.jsp?wrongid=2");}catch(InstantiationException e){response.sendRedirect("wrong.jsp?wrongid=2");}catch(IllegalAccessException e){response.sendRedirect("wrong.jsp?wrongid=2");}catch(ClassNotFoundException e){response.sendRedirect("wrong.jsp?wrongid=2");}finally{if(rs !=null){try{rs.close();}catch(SQLException sqlEx){}// ignorers =null;}if(stmt !=null){try{stmt.close();}catch(SQLException sqlEx){}// ignorestmt =null;}}}wrong.jspString n = request.getParameter("wrongid");if(n.equals("1")){out.println("1.您没输入ID或密码。

如何在JSP中使用MYSQL中的登录界面(内涵完整代码)

如何在JSP中使用MYSQL中的登录界面(内涵完整代码)

如何在JSP中使用MYSQL中的登录界面1．和创建登录的JSP界面，action指向servlet中的方法2．创建一个新的字符用于存储新的数字和字符String msg="";3．获取JSP中输入的数据。

String account = request.getParameter("name");4．Try语句调用后面的方法。

先写方法方法：连接数据库和MYSQL中方法一样try{String driverName="com.mysql.jdbc.Driver";//数据库用户名String userName="root";//密码String userPasswd="";//数据库名String dbName="xueshenbiao";//表名String tableName="nima";//联结字符串Stringurl="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+u serPasswd;Class.forName("com.mysql.jdbc.Driver").newInstance();java.sql.Connectionconnection=DriverManager.getConnection(url);Statement statement = connection.createStatement();重点如下：之前习惯了用select去巡查SQL中数据，现在因为是验证登录所以只要比对是否有一样的数据即可，现在采用SELECT count(*)用于计数，如果返回是0说明不存在登录的用户，返回1说明存在，返回>1说明不止一个。