为什么我最多选择@SessionScope作为支持大豆而我不需要它？

Question

我有一个叫MemberSearchControler的BackingBean。它有一个名为search的方法。当用户调用它时，它从数据库中检索所有成员并存储在List中，同时将所有成员的id存储在int数组中。然后返回引用member.xhtml页面的结果成员 在下文中，您可以看到MemberSearchControler：

@ManagedBean(name="MemberSearchControler")
public class MemebrSearchControl {

    private String text;
    private List<Member> members;

    //For Create CheckBox
    private int[] membersId;
    public int[] getMembersId() {
        return membersId;
    }

    //For get Selected Member Id
    private int[] selectedMembers;
    public void setSelectedMember(int[] ids) {
        selectedMembers=ids;
    }   

    public List<Member> getMembers() {
        return members;
    }
    public int getMembersCount() {
        return membersCount;
    }

    private int membersCount;

    public String getText() {
        return text;
    }
    public void setText(String text) {
        this.text = text;
    }

    public String search() throws DaoImplNotFoundException, DataSourceException{
        MemberDao dao=(MemberDao) Factory.getDao(ConfigReader.getConfig().getProperty("dao.member"));
        members=dao.list(1, 10);
        membersId=new int[members.size()];
        for(int i=0;i<members.size();i++)
            membersId[i]=members.get(i).getId();
        return "member";
    }

    public String view(){
        return "view";
    }

}

在member.xhtml我显示成员数据，我有几个复选框，返回每个成员的ID。您可以在以下内容中看到member.xhtml：

<ui:define name="center-content">
        <h:form id="members">
            <div class="panel panel-primary rgt">
                <!-- Default panel contents -->

                <div class="panel-heading">
                    <div style="float: left;">


                        <h:commandLink styleClass="btn btn-primary table-button" id="btnView" action="#{ViewMemberControler.view}">
                            <h:graphicImage library="img" name="view.png"
                                styleClass=" table-icon" />
                        </h:commandLink>
                        <h:commandLink styleClass="btn btn-primary table-button" id="btnEdit">
                            <h:graphicImage library="img" name="edit-member.png"
                                styleClass=" table-icon" />
                        </h:commandLink>
                        <h:commandLink styleClass="btn btn-primary table-button" action="add">
                            <h:graphicImage library="img" name="add-member.png"
                                styleClass=" table-icon" />
                        </h:commandLink>
                    </div>
                    <h4>
                        <h:outputText value="#{msg['protected.member.table']}" />
                    </h4>
                </div>

                <!-- Table -->
                <t:selectManyCheckbox id="member" value="#{ViewMemberControler.selectedIds}" layout="spread" >
                    <f:selectItems value="#{MemberSearchControler.membersId}" itemLabel="" />
                </t:selectManyCheckbox>
                <h:dataTable styleClass="table table-condensed table-hover rgt"
                    value="#{MemberSearchControler.members}" var="member" id="checkall">

                    <h:column headerClass="cell-10">
                        <f:facet name="header">
                            <h:selectBooleanCheckbox onchange="toggle(this)"/>
                        </f:facet>
                        <t:checkbox for=":members:member" index="#{CounterControler.index}"/>
                    </h:column>
                    <h:column headerClass="cell-15">
                        <f:facet name="header">
                            <p>
                                <h:outputText value="#{msg['protected.member.table.family']}" />
                            </p>
                        </f:facet>
                        <span>#{member.lastName}</span>
                    </h:column>
                    <h:column headerClass="cell-20">
                        <f:facet name="header">
                            <p>
                                <h:outputText value="#{msg['protected.member.table.name']}" />
                            </p>
                        </f:facet>
                        <span>#{member.firstName}</span>
                    </h:column>
                    <h:column headerClass="cell-20">
                        <f:facet name="header">
                            <p>
                                <h:outputText
                                    value="#{msg['protected.member.table.share.count']}" />
                            </p>
                        </f:facet>
                        <span>#{member.shareCount}</span>
                    </h:column>
                    <h:column headerClass="cell-35">
                        <f:facet name="header">
                            <p>
                                <h:outputText
                                    value="#{msg['protected.member.table.phone.number']}" />
                            </p>
                        </f:facet>
                        <span>#{member.phone}</span>
                    </h:column>
                </h:dataTable>
                </div>
        </h:form>
    </ui:define>
</ui:composition>

正如您在上面的代码中看到的，我将用户选中的复选框发送到ViewMemberControler而不是MemberSearchControler。现在我有一个问题。为什么我最常使用MemberSearchControler的@SessionScoped anntotation？如果我选择@RequestScoped将选中复选框的值发送到ViewMemberControler将失败并再次看到member.xhtml页面（但此时没有任何数据）。