賣衣服的收藏jsp頁面代碼,賣衣服的收藏jsp頁面代碼

本文目錄一覽：

• 1、jsp頁面的代碼
• 2、求jsp代碼，題目如下：
• 3、求大神寫一下jsp的簡單的註冊界面代碼。

jsp頁面的代碼

Vector v=(Vector)application.getAttribute(“Mess”);//這行代碼是聲明一個Vector 變量，此變量是一個鍵值對象

其他的太 多了不想寫

求jsp代碼，題目如下：

rect.jsp

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

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

html

head

/head

body

form action=”com.jsp” method=”post”

請輸入正方形的邊長: input type=”text” name=”length” width=”100px”

br/ br/

input type=”submit” value=”submit”

/form

/body

/html

com.jsp

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

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

html

head

/head

body

%

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

float s=0;

try{

s=Float.parseFloat(length);

}

catch (Exception e)

{

out.print(“請輸入有效數值brbr”);

s=0;

}

%

正方形周長為： %=4*s %br/

正方形面積為： %=s*s %br/

/body

/html

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;

}

}