如何在java jsp中获取数组列表大小？
如何在java jsp中获取数组列表大小？
提问于 2014-11-17 06:36:04
我有一个表单，要求用户输入ID。这个表单被发送到一个servlet，它检查数据库，查看用户是否存在。如果用户存在，它就会将他们订购的商品发回给我。排序后的项以数组列表的形式返回。然后这个数组列表被重定向到jsp文件，以便在网页上显示它。用户可以有多个订单，因此数组列表大小可以变化。如何获得数组列表大小，以便显示数组列表中的每一项？我不想使用JSTL。
index.jsp：
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
<script>
/*function signin(id, id2) {
document.getElementById(id).style.display = 'block';
document.getElementById(id2).style.display = 'none';
//document.getElementById(id3).style.display = 'none';
}*/
</script> <form id="Signin" method="post" action="FindUser">
<h2>Login </h2>
<input type="text" name="txtCustID"
placeholder="UserID"><br>
<br><input type="submit" value="Find">
</form>
<%--!<form id="Signup" method="post" action="FindUser"
style="display:none;">
<h2>Sign Up </h2>
<input type="text" name="UserId"
placeholder="User ID"><br>
<br><input type="text" name="FirstaName"
placeholder="First Name"><br>
<br><input type="text" name="LastName"
placeholder="Last Name"><br>
<br><input type="text" name="Street"
placeholder="Street"><br>
<br><input type="text" name="City"
placeholder="City"><br>
<br><input type="submit" value="Sign Up">
</form> --%>
</body>
FindUser.java：
public class FindUser extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
String sID = request.getParameter("txtCustID");
String url = ("admin/UserFound.jsp");
try {
Users one = UserDAO.findUser(sID);
request.setAttribute("theCustomer", one);
if (one.getFirstName().equals("none")) {
url = "admin/UserNotFound.jsp";
}
ArrayList user_order = UserDAO.findOrder(sID);
request.setAttribute("theOrder", user_order);
response.sendRedirect(url);
//RequestDispatcher rd = request.getRequestDispatcher(url);
//rd.forward(request, response);
} catch (ClassNotFoundException e) {
System.err.print("Failed to load Driver");
System.err.print(e);
} catch (SQLException e) {
System.err.print("SQL Error" + e);
System.err.print("SQL State: " + e.getSQLState());
System.err.print("Error Code: " + e.getErrorCode());
} catch (Exception e) {
System.err.println(e);
}
}UserFound.jsp：
<%--
Document : CustomerFound
Created on : Nov 15, 2014, 9:40:47 PM
Author : mississauga
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<p>First word is: ${theOrder[x].getBoxes()}</P>
<%--<form id="Signin" method="post" action="FindUser"
style="display:none;">
<h2>Login </h2>
<input type="text" name="txtCustID"
placeholder="UserID"><br>
<br><input type="submit" value="Find">
</form> --%>
</body>
</html>
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26962866
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