java如何在一个会话中为每个请求逐个存储多个对象？

Question

我正在为一个应用程序工作，在这个应用程序中，我必须为每个请求发送一个对象。我必须将整个数据存储在会话变量中。我该怎么做？我将数据发送到控制器并创建对象，然后尝试存储在会话中，但它不工作，这是我的代码

MemberDependentBO memberdepinfo = new MemberDependentBO();

        memberdepinfo.setFirstName(getMemberFirstName().getValue().toString());
        memberdepinfo.setLastName(getMemberLastName().getValue().toString());
        memberdepinfo.setMiddleName(getMemberMiddleName().getValue().toString());
        memberdepinfo.setPassport(getMemberPassportNumber().getValue().toString());

    List<MemberDependentBO> listOfMemberAndDep = new ArrayList<MemberDependentBO>();

        listOfMemberAndDep.add(memberdepinfo);

        httpSession.setAttribute("insuredInfo", listOfMemberAndDep);

        System.out.println("List Size :"+listOfMemberAndDep.size());

Every time when i click the button,the object is coming from the controller .but each time i am getting the size of the list is 1.Any Help will be appreciated

Answer 1

首先尝试将listOfMemberAndDep从当前会话中拉出。如果不存在，请创建它，添加memberdepinfo并保存在会话中。如果确实存在，只需添加memberdepinfo并在会话中重新保存即可。像这样的

List<MemberDependentBO> listOfMemberAndDep = (List<MemberDependentBO>)httpSession.getAttribute("insuredInfo");

if(listOfMemberAndDep == null){
    listOfMemberAndDep = new ArrayList<MemberDependentBO>();
}

MemberDependentBO memberdepinfo = new MemberDependentBO();
memberdepinfo.setFirstName(getMemberFirstName().getValue().toString());
memberdepinfo.setLastName(getMemberLastName().getValue().toString());
memberdepinfo.setMiddleName(getMemberMiddleName().getValue().toString());
memberdepinfo.setPassport(getMemberPassportNumber().getValue().toString();

listOfMemberAndDep.add(memberdepinfo);
httpSession.setAttribute("insuredInfo", listOfMemberAndDep);
System.out.println("List Size :"+listOfMemberAndDep.size());