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java - JSP 页面能否记住它拥有的旧对象?

转载 作者:行者123 更新时间:2023-11-28 02:05:18 25 4
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我要从:

JSP1->JSP2-JSP3-JSP1

JSP1 - 管理屏幕中,我有存储 Administrator 数据的对象:这是 adminPage.jsp

<!DOCTYPE html>
<html>
<head><title>System Administrator Page</title>
<link rel="stylesheet"
href="./css/styles.css"
type="text/css"/>
</head>
<body>


<h1>Hello ${name.firstName} ${name.lastName} , You've logged in successfully!</h1>
<h1>
Please choose one of the following options
</h1>

<fieldset>
<legend>Add a new employee to the bank system</legend>
<form action="blablabla"> <!-- THAT ONE forwards to a servlet that's called Admin1.java -->
<a href="adminAdds1">Press here to continue</a>
</form>
</fieldset>


<!-- NOTE THE FORWARDS TO THE SERVLETS -->


<fieldset>
<legend>Add a new manager to the bank system</legend>
<form action="blablabla"> <!-- THAT ONE forwards to a servlet that's called Admin2.java -->
<a href="adminAdds2">Press here to continue</a>
</form>
</fieldset>

</body></html>

图片:

enter image description here

然后我转到下一页 - JSP2,它是 adminAddNewEmployee.jsp:

<!DOCTYPE html>
<html>
<head><title>System Administrator Page</title>
<link rel="stylesheet"
href="./css/styles.css"
type="text/css"/>
</head>
<body>


<h1>Registration Page for Administrator!</h1>
<h1>
Add a new employee to the bank system
</h1>

<!-- Admin adds a new employee -->

<fieldset>
<legend>Registration</legend>
<form action="adminOperation1">
First name: <input type="text" name="firstName"><br>
Last name : <input type="text" name="lastName"><br>
Address : <input type="text" name="address"><br>
ID-number : <input type="text" name="idnumber"><br>
User-Name : <input type="text" name="userName"><br>
Password : <input type="text" name="password"><br>
Status : <input type="text" name="status"><br>
<input type="submit" value="Register">
</form>
</fieldset>

</body></html>

看起来像这样:

enter image description here

而我,管理员,向系统添加了一个新的经理。

然后我到达这里 - JSP3 即:adminSuccess.jsp

<!DOCTYPE html>
<html>
<head><title>Database has been updated successfully!</title>
<link rel="stylesheet"
href="./css/styles.css"
type="text/css"/>
</head>
<body>
<h1>Congratulations , Database has been updated successfully for the following Manager!</h1>
<h2>Manager's first-Name: ${name.firstName}</h2>
<h2>Manager's last-Name: ${name.lastName}</h2>
<h2>Manager's address: ${name.address}</h2>
<h2>Manager's password: ${name.password}</h2>
<h2>Manager's user-Name: ${name.userName}</h2>
<h2>Manager's id-Number: ${name.idnumber }</h2>

<fieldset>
<legend>Continue to Admin's transactions page</legend>
<form action="blablabla">
<a href="adminAdds3">Press here to continue</a>
</form>
</fieldset>

</body></html>

图片:

enter image description here

现在,我想回到母库,例如 JSP1,即 adminPage.jsp,所以我添加了一个 servlet:

/**
* Servlet implementation class Admin3
*/
@WebServlet("/adminAdds3")
public class Admin3 extends HttpServlet {
private static final long serialVersionUID = 1L;


protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
request.getRequestDispatcher("/WEB-INF/results/adminPage.jsp").forward(request, response);
}


}

为了回到 JSP1 ,但后来我得到了这个:

enter image description here

所以,代替我的原始管理员,Jack Reacher,我得到了 David Bowie.....

旧管理员未存储。

我该如何解决这个问题?

问候

最佳答案

您需要在登录帐户时设置 session 变量(已登录用户的名称和 ID),并且当您需要此 ID 和用户名时,您可以通过访问 session 变量来获取它。这肯定会解决你的问题

尝试在 jsp2 上将文本框的名称从 firstname 更改为 first_name

关于java - JSP 页面能否记住它拥有的旧对象?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11858384/

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