jsp工程界面_用jsp怎樣做一個用戶登錄界面

Ⅰ 求大神寫一下jsp的簡單的注冊界面代碼。

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（包括查詢資料庫操作）
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（包括查詢資料庫操作）
//UserService 核心代碼
public class UserService{
/**
*查詢資料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;
//這里以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;
}
}

Ⅱ 怎樣用JSP做一個查詢界面

先用DW畫一個界面，上麵包含你要查詢的條件輸入框，還要有一個顯示數據的列表，再加一個按鈕就可以了，最後把擴展名改為.JSP放入工程中，在其裡面寫上相應的java代碼或JSP表達式，實現功能就行了

Ⅲ jsp登陸界面源代碼

1、login.jsp文件

<%@ 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>

</head>

<body>

<table>

<tr>

</tr>

<tr>

</tr>

<tr>

<td><input 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>

2、judge.jsp文件

<%@ 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>

</head>

<body>

request.setCharacterEncoding("GB18030");

String name = request.getParameter("userName");

String password = request.getParameter("password");

if(name.equals("abc")&& password.equals("123")) {

3、afterLogin.jsp文件

<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>

</head>

<body>

request.setCharacterEncoding("GB18030");

String name = request.getParameter("userName");

out.println("歡迎你:" + name);

</body>

</html>

(3)jsp工程界面擴展閱讀：

java web登錄界面源代碼：

1、Data_uil.java文件

import java.sql.*;

public class Data_uil

{

public Connection getConnection()

{

try{

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

}catch(ClassNotFoundException e)

{

e.printStackTrace();

}

String user="***";

String password="***";

String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=***";

Connection con=null;

try{

con=DriverManager.getConnection(url,user,password);

}catch(SQLException e)

{

e.printStackTrace();

}

return con;

}

public String selectPassword(String username)

{

Connection connection=getConnection();

String sql="select *from login where username=?";

PreparedStatement preparedStatement=null;

ResultSet result=null;

String password=null;

try{

preparedStatement=connection.prepareStatement(sql);

preparedStatement.setString(1,username);

result=preparedStatement.executeQuery();//可執行的查詢

if(result.next())

password=result.getString("password");

}catch(SQLException e){

e.printStackTrace();

}finally

{

close(preparedStatement);

close(result);

close(connection);

}

System.out.println("找到的資料庫密碼為："+password);

return password;

}

public void close (Connection con)

{

try{

if(con!=null)

{

con.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

public void close (PreparedStatement preparedStatement)

{

try{

if(preparedStatement!=null)

{

preparedStatement.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

public void close(ResultSet resultSet)

{

try{

if(resultSet!=null)

{

resultSet.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

2、login_check.jsp:文件

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>驗證用戶密碼</title>

</head>

<body>

<jsp:useBean id="util" class="util.Data_uil" scope="page" />

String username=(String)request.getParameter("username");

String password=(String)request.getParameter("password");

if(username==null||"".equals(username))

{

out.print("<script language='javaScript'> alert('用戶名不能為空');</script>");

response.setHeader("refresh", "0;url=user_login.jsp");

}

else

{

System.out.println("輸入的用戶名:"+username);

String passwordInDataBase=util.selectPassword(username);

System.out.println("密碼："+passwordInDataBase);

if(passwordInDataBase==null||"".equals(passwordInDataBase))

{

out.print("<script language='javaScript'> alert('用戶名不存在');</script>");

response.setHeader("refresh", "0;url=user_login.jsp");

}

else if(passwordInDataBase.equals(password))

{

out.print("<script language='javaScript'> alert('登錄成功');</script>");

response.setHeader("refresh", "0;url=loginSucces.jsp");

}

else

{

out.print("<script language='javaScript'> alert('密碼錯誤');</script>");

response.setHeader("refresh", "0;url=user_login.jsp");

}

</body>

</html>

3、loginSucces.jsp文件

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

</body>

</html>

4、user_login.jsp文件

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

</head>

<h1 style="color:yellow">Login</h1>

<br>

<tr >

</tr>

<tr>

</td>

</tr>

</table>

<br>

</form>

</center>

</body>

</html>

Ⅳ 用jsp怎樣做一個用戶登錄界面

//jsp文件,登錄界面
<%@pagepageEncoding="utf-8"contentType="text/html;charset=utf-8"%>
<body>
<h1>Register</h1>
<hr/>
<formaction="login"method="post">
用戶名：š
<inputtype="text"name="username"id="text"/>
密碼：š
<inputtype="password"name="pwd"id="text"//>
<inputtype="submit"value="登錄"id="button"/>
</form>
</body>

//這是server文件，web.xml部署名字login
importjava.io.IOException;

importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;

{

	publicvoidservice(HttpServletRequestrequest,HttpServletResponseresponse)
	throwsServletException,IOException{

		.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("utf-8");
		Stringusername=request.getParameter("username");
		Stringpwd=request.getParameter("pwd");

		try{
			if(username.equals（"name"）&&pwd.equals("pwd")){
			system.out.print("登錄成功");
			}else{
			system.out.print("error");
			}
		}catch(Exceptione){
			e.printStackTrace();
		}
	}
}

簡單的登錄界面，不需要資料庫，如果要鏈接資料庫就要判斷很多了

Ⅳ 編寫 JSP 頁面，界面中顯示 1~9，9 個鏈接，單擊每個鏈接，能夠在另一個頁面列印該數字的平方。

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>test.jsp</title>
</head>

<body>
<%
String s = null;
if ((s = request.getParameter("num")) != null) {
int i = Integer.parseInt(s);
out.println((i * i) + "<br />");
}
%>

<%
for (int i = 1; i < 10; i++) {
%>
<a href="test.jsp?num=<%=i%>"><%=i%></a>
<%
}
%>
</body>
</html>

Ⅵ jsp登陸界面源代碼

<%@ 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>

</head>

<body>

<table>

<tr>

</tr>

<tr>

</tr>

<tr>

<td><input 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>

Data_uil.java文件代碼：

import java.sql.*;

public class Data_uil

{

public Connection getConnection()

{

try{

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

}catch(ClassNotFoundException e)

{

e.printStackTrace();

}

String user="***";

String password="***";

String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=***";

Connection con=null;

try{

con=DriverManager.getConnection(url,user,password);

}catch(SQLException e)

{

e.printStackTrace();

}

return con;

}

public String selectPassword(String username)

{

Connection connection=getConnection();

String sql="select *from login where username=?";

PreparedStatement preparedStatement=null;

ResultSet result=null;

String password=null;

try{

preparedStatement=connection.prepareStatement(sql);

preparedStatement.setString(1,username);

result=preparedStatement.executeQuery();//可執行的查詢

if(result.next())

password=result.getString("password");

}catch(SQLException e){

e.printStackTrace();

}finally

{

close(preparedStatement);

close(result);

close(connection);

}

System.out.println("找到的資料庫密碼為："+password);

return password;

}

public void close (Connection con)

{

try{

if(con!=null)

{

con.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

public void close (PreparedStatement preparedStatement)

{

try{

if(preparedStatement!=null)

{

preparedStatement.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

public void close(ResultSet resultSet)

{

try{

if(resultSet!=null)

{

resultSet.close();

}

}catch(SQLException e)

{

e.printStackTrace();

}

Ⅶ 如何在eclipse中運行jsp頁面

使用eclipse編寫並運行jsp程序的步驟

1、點擊File->New->Project，在出現的菜單中選擇Web->Dynamic Web Project，點擊next

2、在Project name中填寫工程名稱，在target runtime中點擊New runtime，選擇自己安裝的版本的tomcat，點擊Finish

3、在左邊的Project Explorer中可以找到新建立的工程MyJsp，在工程中找到WebContent

4、右鍵WebContent，new->jsp file，在出現的窗口，在file name欄可以更改文件名，finish

5、然後就可以編寫jsp文件了，需要注意的是，在生成的部分代碼中，要將charset後的參數改成「utf-8」，否則顯示中文會出現亂碼

6、編寫jsp文件，實現想要實現的功能

7、點擊工具欄中間的綠色按鈕即可運行

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