jsp设计登录页面代码（jsp设计登录页面代码是什么）

本文目录一览：

• 1、求大神写一下jsp的简单的注册界面代码。
• 2、JSP编写一个登陆界面
• 3、jsp登录代码
• 4、编写用户注册于登录的JSP页面的全部程序代码

求大神写一下jsp的简单的注册界面代码。

1.需要一个jsp页面：

//login.jsp核心代码：

form action=”${pageContext.request.contextPath}/servlet/UserServlet” method=”post”

input type=”text” name=”loginname” /input type=”password” name=”password”/

input type=”submit” value=”登录”/

/form

2.需要一个servlet来验证登录信息

//UserServlet 核心代码

class UserServlet extends HttpServlet{

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

process(request, response);

}

protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

process(request, response);

}

private void process(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

PrintWriter pw = response.getWriter();

request.setCharacterEncoding(“UTF-8”);

response.setContentType(“text/html”);

String loginname = request.getParameter(“loginname”);

String password = request.getParameter(“password”);

//创建一个service来处理业务逻辑（包括查询数据库操作）

UserService service = new UserService();

boolean bool = service.validateUser(loginname,password);

if(!bool){

pw.println(“用户名或密码错误”);

}else{

pw.println(“登录成功”);

}

}

3.需要一个service处理业务逻辑（包括查询数据库操作）

//UserService 核心代码

public class UserService{

/**

*查询数据库验证用户是否存在，返回boolean

*/

public boolean validateUser(String loginname,String password){

boolean bool = false;

Connection conn = null;

PreparedStatement ps = null;

//这里以mysql为例

try {

Class.forName(“com.mysql.jdbc.Driver”).newInstance();

conn = DriverManager.getConnection(“jdbc:mysql://localhost:3306/test”, “root”, “”);

String sql = “select login_name,pass_word from t_user where login_name=? and pass_word=?”;

ps = conn.prepareStatement(sql);

ps.setString(0, loginname);

ps.setString(1, password);

ResultSet rs = ps.executeQuery();

if(rs.next()){

bool = true;

}

} catch (Exception e) {

e.printStackTrace();

} finally{

try {

if(conn != null){

conn.close();

conn = null;

}

if(ps != null){

ps.close();

ps = null;

}

} catch (SQLException e) {

e.printStackTrace();

}

}

return bool;

}

}

JSP编写一个登陆界面

1、首先准备Dreamweaver8软件，解压安装。如下图所示:这件点击安装程序，然后输入序列号就可以了。

2、在安装软件时候，我们可以看到是否关联【jsp文件】。

3、安装好了软件以后，我们打开Dreamweaver8软件。点击菜单上的【文件】——【新建】。

4、弹出【新建文档】——【动态页】——【jsp】——【创建】。

5、点击【拆分】，在【body】标签下面输入：%     out.println(“Hello World！”);     %。

6、然后按快捷键【ctrl+s】保存jsp文件。保存类型jps;。

jsp登录代码

login.jsp

%@ page language=”java” pageEncoding=”utf-8″%

html

head

title登录/title

script language=”javascript”

function checkform() {

if (form4.name.value.length==0){

alert(“请输入正确的姓名！”);

form4.name.focus();

return false;

}

if (form4.password.value.length==0){

alert(“请输入正确的密码!”);

form4.password.focus();

return false;

}

}

/script

style type=”text/css”

!–

#Layer1 {

position:absolute;

left:16px;

top:442px;

width:276px;

height:239px;

z-index:1;

}

#Layer2 {

position:absolute;

left:29px;

top:305px;

width:181px;

height:137px;

z-index:2;

}

—

/style

/head

body

div id=”Layer1″ style=”left: 16px; width: 369px;”

form id=”form4″ name=”form4″ method=”post” action=”loginControl.jsp”

table border=”0″ style=”top: 443px; left: 17px; width: 240px; height: 240px;”

tr

td colspan=”3″ div align=”center”strong用户登录/strong/div/td

/tr

tr

td div align=”right”strong用户名:/strong/div/td

td colspan=”1″input type=”text” name=”name” //td

/tr

tr

td div align=”right”strong密 码:/strongstrong /strong/div/td

td colspan=”1″input type=”password” name=”password” //td

/tr

tr

td height=”37″ colspan=”3″

label

    input type=”submit” name=”Submit” value=”登录”onclick=”javascript:return(checkform());” /

/label

input type=”reset” name=”reset” value=”重填” /

/td

/tr

/table

/form

/div

div id=”Layer2″ img src=2.jpg width=”120″ height=”120″//div

label/label

/body

/html

loginControl.jsp

%@ page language=”java” import=”java.util.*” pageEncoding=”UTF-8″%

%@ include file=”tdb.jsp”%

!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”

html

style type=”text/css”

!–

#Layer1 {

position:absolute;

left:9px;

top:363px;

width:218px;

height:133px;

z-index:1;

}

—

/style

head

titleMy JSP ‘loginControl.jsp’ starting page/title

/head

body

%

String name= request.getParameter(“name”);

String password= request.getParameter(“password”);

System.out.println(“成功11111”);

sql=”SELECT * FROM tdb WHERE user_Name='”+name+”‘ AND user_Pwd='”+password+”‘”;

rs = smt.executeQuery(sql);

if(!rs.next())

{%

script type=”text/javascript”

alert(“用户名和密码不正确！！！”);

window.location.href=’index.jsp’;

/script%

}

response.sendRedirect(“main.jsp”);

%

/body

/html

tdb.jsp

%

Class.forName(“oracle.jdbc.OracleDriver”);

java.sql.Connection con=null;

con=java.sql.DriverManager.getConnection(“jdbc:oracle:thin:@127.0.0.1:1521:ABC”,”zhan”,”123″);

java.sql.Statement smt=con.createStatement();

java.sql.ResultSet rs;

java.sql.PreparedStatement ps;

String sql;

%

编写用户注册于登录的JSP页面的全部程序代码

3个jsp文件，第一个是login.jsp,第二个是judge.jsp,第三个是afterLogin.jsp

%@ page language=”java” contentType=”text/html; charset=GB18030″

pageEncoding=”GB18030″%

%@ page import=”java.util.*” %

!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”

html

head

title登录页面/title

/head

body

form name=”loginForm” method=”post” action=”judgeUser.jsp”

table

tr

td用户名:input type=”text” name=”userName” id=”userName”/td

/tr

tr

td密码:input type=”password” name=”password” id=”password”/td

/tr

tr

tdinput type=”submit” value=”登录” style=”background-color:pink” input type=”reset” value=”重置” style=”background-color:red”/td

/tr

/table

/form

/body

/html

%@ page language=”java” contentType=”text/html; charset=GB18030″

pageEncoding=”GB18030″%

%@ page import=”java.util.*” %

!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”

html

head

title身份验证/title

/head

body

%

request.setCharacterEncoding(“GB18030”);

String name = request.getParameter(“userName”);

String password = request.getParameter(“password”);

if(name.equals(“abc”) password.equals(“123”)) {

%

jsp:forward page=”afterLogin.jsp”

jsp:param name=”userName” value=”%=name%”/

/jsp:forward

%

}

else {

%

jsp:forward page=”login.jsp”/

%

}

%

/body

/html

%@ page language=”java” contentType=”text/html; charset=GB18030″

pageEncoding=”GB18030″%

!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”

html

head

title登录成功/title

/head

body

%

request.setCharacterEncoding(“GB18030”);

String name = request.getParameter(“userName”);

out.println(“欢迎你:” + name);

%

/body

/html