java MVC通过JSP发送带有请求/会话的字段值

1 年，3 月 Questions & Answers 86

我正在尝试创建一个Party类型的成员列表，并将他们的memberID链接到一个更新页面，该页面会自动获取被单击成员的memberID

我已经在servlet中编写了代码来显示所有成员的视图，每个成员的ID都链接到一个名为UpdateParty的页面。然而，我想要的是，被点击的ID与请求一起传递，以便可以在UpdateParty中使用。jsp作为参数，这样用户就不必输入它

如果有人想知道的话，我正在使用postgres作为我的SQL

生成所有党员列表的Servlet代码：

  else if (request.getParameter("listallmembers") != null) {
                    try {

                        User sessionuser = (User) session.getAttribute("User");
                        String u = sessionuser.getUsername();
                        ArrayList<Party> p = new ArrayList<Party>();
                        ResultSet rs = this.findAllMembers(u);

                        while (rs.next()) {
                            Party party = new Party();

                            party.setMemberID(rs.getString("memberID"));
                            party.setPartyFirstname(rs.getString("partyFirstname"));
                            party.setPartySurname(rs.getString("partySurname"));
                            party.setUsername(rs.getString("username"));

                            p.add(party);
                        }

                        request.setAttribute("members", p);
                        request.getRequestDispatcher("ViewPartyMembers.jsp").forward(request, response);
                    } catch (Exception e) {
                        out.print(e);
                        e.printStackTrace(out);
                    }

ViewPartyMembers的代码。jsp:

<%@page import="HolidayExchange.Party"%>
<%@page import="HolidayExchange.User"%>
<%@page import="java.util.List"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>All Party Members</title>
    </head>
    <body>
        <h1>View Party Members</h1>



        <%
        List<Party> l = (List<Party>) request.getAttribute("members");

        if(l!=null){
            out.println("<table>");
            out.println("<tr><th>Member ID</th><th>Firstname</th><th>Second Name</th><th>Associated User</th></tr>");
            for(int i = 0; i < l.size();i++){
                    out.println("<tr><td>"+ l.get(i).getMemberID() +
                            "</td><td><a href='UpdateParty.jsp'>"+ l.get(i).getPartyFirstname() + 
                            "</a></td><td>"+ l.get(i).getPartySurname() + 
                            "</td><td>" + l.get(i).getUsername() + "</td>");
                    out.println("</tr>");
            }
            out.println("</table>");
        }else{
        %>

        <form action="PartyServlet" method="get">
            <input type="hidden" name="listallmembers" value="1" /><br />
            <input type="submit" value="Show all Members" />
        </form>

        <%

        }
        %>



    </body>
</html>

<%@page contentType="text/html" pageEncoding="UTF-8"%> <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>All Party Members</title> </head> <body> <h1>View Party Members</h1> <c:if test="${!empty members}"> <table> <tr><th>Member ID</th><th>Firstname</th><th>Second Name</th><th>Associated User</th></tr> <c:forEach items="${members}" var="member"> <tr><td>${member.memberID}</td> <c:url value="link" value="UpdateParty.jsp"> <c:param name="memberId" value="${member.memberID}"/> </c:url> <td><a href="${link}">${member.partyFirstname}</a></td> <td>${member.partySurname}</td> <td>${member.username}</td> </tr> </c:forEach> </table> </c:if> <c:if test="${empty members}"> <form action="PartyServlet" method="get"> <input type="hidden" name="listallmembers" value="1" /><br /> <input type="submit" value="Show all Members" /> </form> </c:if> </body> </html>

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java MVC通过JSP发送带有请求/会话的字段值

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