jsp設計登錄頁面代碼（jsp設計登錄頁面代碼是什麼）

本文目錄一覽：

• 1、求大神寫一下jsp的簡單的註冊界面代碼。
• 2、JSP編寫一個登陸界面
• 3、jsp登錄代碼
• 4、編寫用戶註冊於登錄的JSP頁面的全部程序代碼

求大神寫一下jsp的簡單的註冊界面代碼。

1.需要一個jsp頁面：

//login.jsp核心代碼：

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

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

input type=”submit” value=”登錄”/

/form

2.需要一個servlet來驗證登錄信息

//UserServlet 核心代碼

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”);

//創建一個service來處理業務邏輯（包括查詢數據庫操作）

UserService service = new UserService();

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

if(!bool){

pw.println(“用戶名或密碼錯誤”);

}else{

pw.println(“登錄成功”);

}

}

3.需要一個service處理業務邏輯（包括查詢數據庫操作）

//UserService 核心代碼

public class UserService{

/**

*查詢數據庫驗證用戶是否存在，返回boolean

*/

public boolean validateUser(String loginname,String password){

boolean bool = false;

Connection conn = null;

PreparedStatement ps = null;

//這裡以mysql為例

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編寫一個登陸界面

1、首先準備Dreamweaver8軟件，解壓安裝。如下圖所示:這件點擊安裝程序，然後輸入序列號就可以了。

2、在安裝軟件時候，我們可以看到是否關聯【jsp文件】。

3、安裝好了軟件以後，我們打開Dreamweaver8軟件。點擊菜單上的【文件】——【新建】。

4、彈出【新建文檔】——【動態頁】——【jsp】——【創建】。

5、點擊【拆分】，在【body】標籤下面輸入：%     out.println(“Hello World！”);     %。

6、然後按快捷鍵【ctrl+s】保存jsp文件。保存類型jps;。

jsp登錄代碼

login.jsp

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

html

head

title登錄/title

script language=”javascript”

function checkform() {

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

alert(“請輸入正確的姓名！”);

form4.name.focus();

return false;

}

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

alert(“請輸入正確的密碼!”);

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用戶登錄/strong/div/td

/tr

tr

td div align=”right”strong用戶名:/strong/div/td

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

/tr

tr

td div align=”right”strong密 碼:/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=”登錄”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(“用戶名和密碼不正確！！！”);

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;

%

編寫用戶註冊於登錄的JSP頁面的全部程序代碼

3個jsp文件，第一個是login.jsp,第二個是judge.jsp,第三個是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登錄頁面/title

/head

body

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

table

tr

td用戶名:input type=”text” name=”userName” id=”userName”/td

/tr

tr

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

/tr

tr

tdinput type=”submit” value=”登錄” 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身份驗證/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登錄成功/title

/head

body

%

request.setCharacterEncoding(“GB18030”);

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

out.println(“歡迎你:” + name);

%

/body

/html