0

我有一个 ViewScoped bean 支持的 jsf 页面，其中列出了如下所示的一堆事务

<ui:repeat value="#{transactions_byaccount.pageList}" var="item">
            <tr class="dataRow">
                <td class="dataCell cltdtransactionsdatetransaction">
                      <h:outputText value="#{item.datetransaction}" >
                        <f:convertDateTime pattern="EEE dd-MMM-yyyy HH:mm" />
                      </h:outputText>
                </td>
                ...
                ...

                <td colspan="2">
                    <span class="pagerDBspan" style="font-weight: bold;">
                        <h:commandLink action="#{transactions_byaccount.updateCategory('', item)}" >
                            <h:outputText value="Update"></h:outputText>        
                            <f:param name="pageNo" value="#{param.pageNo}" />
                            <f:param name="accountId" value="#{param.accountId}" />
                            <f:param name="sortOrder" value="#{param.sortOrder}" />
                            <f:param name="orderColumn" value="#{param.orderColumn}" />                                                                         
                        </h:commandLink>
                    </span>                                         
                </td>

当用户导航到页面时，该链接将 accountId 作为参数传入，该参数映射到 bean 上的托管属性，如下所示

@ManagedProperty("#{param.accountId}")
private int accountId;

此时调用传递 'item' 的方法 #{transactions_byaccount.updateCategory('', item)} 按预期工作。

用户还可以通过选择绑定到上面 accountId 字段的页面上的下拉菜单并单击刷新按钮来更改帐户 ID，该按钮将调用相关 DAO 以获取所选帐户的交易列表。但是，当用户单击按钮调用 #{transactions_byaccount.updateCategory('', item)} 时，我并没有列出新帐户中的项目，而是使用第一个帐户列表中的项目。

看来问题出在 JSF 生命周期的恢复位上。

任何帮助，将不胜感激。如果需要，将添加更多详细信息。

谢谢玛尼

编辑：我的豆子

package applogic.transactions;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ViewScoped;
import javax.faces.model.SelectItem;

import applogic.Conns;

import finance.bean.TransactionsListBean;
import finance.dao.AccountsDAO;
import finance.dao.TransactionsDAO;
import finance.daobase.BusinessDAO;
import finance.model.Accounts;
import finance.model.Transactions;
import java.io.Serializable;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

@ManagedBean(name = "transactions_byaccount")
@ViewScoped
public class Transactions_Byaccount extends TransactionsListBean implements Serializable {
    List<Transactions> resultList;

    boolean initialized;

    @ManagedProperty("#{param.accountId}")
    private int accountId;

    public SelectItem[] accountsSelections;

    @ManagedProperty("#{param.sortOrder}")
    private int sortOrder;

    public SelectItem[] sortOrderSelections;

    @ManagedProperty("#{param.orderColumn}")
    private int orderColumn;

    public SelectItem[] orderColumnSelections;

    public Transactions_Byaccount() {
         Connection cons = Conns.getConFinanceDB();
         List<Accounts> accountsList = AccountsDAO.List(cons);
         List<SelectItem> listOfAccountsSelectItems = new
         ArrayList<SelectItem>();

         for( Accounts temp : accountsList ) {
             listOfAccountsSelectItems.add(new SelectItem(temp.getId(), temp.getTitle()));
         }

         accountsSelections = listOfAccountsSelectItems.toArray(new SelectItem[listOfAccountsSelectItems.size()]);

         List<SelectItem> sortOrderList = new ArrayList<SelectItem>();
         sortOrderList.add(new SelectItem(1, "Asc"));
         sortOrderList.add(new SelectItem(2, "Desc"));       
         sortOrderSelections = sortOrderList.toArray(new SelectItem[sortOrderList.size()]);

         List<SelectItem> orderColumnList = new ArrayList<SelectItem>();
         orderColumnList.add(new SelectItem(1, "Transaction Date"));
         orderColumnList.add(new SelectItem(2, "Action Date"));      
         orderColumnList.add(new SelectItem(3, "Reconciled Date"));
         orderColumnSelections = orderColumnList.toArray(new SelectItem[orderColumnList.size()]);
    }

    public String updateCategories(String redirectURL) {
        String result = redirectURL;

        Connection cons = Conns.getConFinanceDB();
        for( Transactions temp : (List<Transactions>)this.getPageList() )
            TransactionsDAO.Update(cons, temp);

        resultList = null;

        if( redirectURL != null && redirectURL.length() == 0 )
            redirectURL = null;

        return redirectURL;
    }

    public String updateCategory(String redirectURL, Transactions arg) {
        String result = redirectURL;

        Connection cons = Conns.getConFinanceDB();
        TransactionsDAO.Update(cons, arg);

        resultList = null;

        if( redirectURL != null && redirectURL.length() == 0 )
            redirectURL = null;

        return result;
    }

    @PostConstruct
    public void refresh() {
        Connection con = Conns.getConFinanceDB();
        resultList = TransactionsDAO.ListByaccount(con, accountId, getCurrentPageNo(), getPageSize(), orderColumn, sortOrder);
        initialized = true;

    }

    public void reload() {
        Connection con = Conns.getConFinanceDB();
        resultList = TransactionsDAO.ListByaccount(con, accountId, getCurrentPageNo(), getPageSize(), orderColumn, sortOrder);
        initialized = true;

    }

    public String reload(String returnUrl) {
        Connection con = Conns.getConFinanceDB();
        resultList = TransactionsDAO.ListByaccount(con, accountId, getCurrentPageNo(), getPageSize(), orderColumn, sortOrder);
        initialized = true;     
        return returnUrl;
    }

    public Object getPageList() {


        return resultList;
    }

    public int getMaxCount() {
        Connection con = Conns.getConFinanceDB();
        int result = TransactionsDAO.CountByaccount(con, accountId);
        return result;
    }

    public int getAccountId() {
        return accountId;
    }

    public void setAccountId(int accountId) {
        this.accountId = accountId;
    }

    public SelectItem[] getAccountsSelections() {
        return accountsSelections;
    }

    public void setAccountsSelections(SelectItem[] accountsSelections) {
        this.accountsSelections = accountsSelections;
    }

    public int getSortOrder() {
        return sortOrder;
    }

    public void setSortOrder(int sortOrder) {
        this.sortOrder = sortOrder;
    }

    public SelectItem[] getSortOrderSelections() {
        return sortOrderSelections;
    }

    public void setSortOrderSelections(SelectItem[] sortOrderSelections) {
        this.sortOrderSelections = sortOrderSelections;
    }

    public int getOrderColumn() {
        return orderColumn;
    }

    public void setOrderColumn(int orderColumn) {
        this.orderColumn = orderColumn;
    }

    public SelectItem[] getOrderColumnSelections() {
        return orderColumnSelections;
    }

    public void setOrderColumnSelections(SelectItem[] orderColumnSelections) {
        this.orderColumnSelections = orderColumnSelections;
    }   

    public boolean isInitialized() {
        return initialized;
    }

    public void setInitialized(boolean initialized) {
        this.initialized = initialized;
    }

    public List<Transactions> getResultList() {
        return resultList;
    }

    public void setResultList(List<Transactions> resultList) {
        this.resultList = resultList;
    }
}

现在我的页面

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:t="http://myfaces.apache.org/tomahawk"
    xmlns:f="http://java.sun.com/jsf/core" xml:lang="en" lang="en">


<ui:composition template="/WEB-INF/templates/template_main.xhtml">
    <ui:param name="title" value="transactions"></ui:param>

    <ui:define name="operationalbar">
        <div>
            <span>
                <h:selectOneMenu value="#{transactions_byaccount.accountId}" >
                    <f:selectItems value="#{transactions_byaccount.accountsSelections}"/>
                </h:selectOneMenu>
            </span>
            <span>
                <h:commandLink action="#{transactions_byaccount.reload('')}">
                    <h:outputText value="Reload"></h:outputText>
                    <f:param name="pageNo" value="#{param.pageNo}" />
                    <f:param name="accountId" value="#{param.accountId}" />
                    <f:param name="sortOrder" value="#{param.sortOrder}" />
                    <f:param name="orderColumn" value="#{param.orderColumn}" />
                </h:commandLink>
            </span>         
            <span>
                <h:commandLink action="#{transactions_byaccount.updateCategories('')}">
                    <h:outputText value="Update Categories"></h:outputText>
                    <f:param name="pageNo" value="#{param.pageNo}" />
                    <f:param name="accountId" value="#{param.accountId}" />
                    <f:param name="sortOrder" value="#{param.sortOrder}" />
                    <f:param name="orderColumn" value="#{param.orderColumn}" />
                </h:commandLink>        
            </span>
        </div>
    </ui:define>

    <ui:define name="pagingbar">
        <div>
            <span>
                <h:commandLink title="Go to page first page" >
                    <h:outputText value="first"></h:outputText>
                        <f:param name="pageNo" value="#{transactions_byaccount.firstPage}" />
                        <f:param name="accountId" value="#{param.accountId}" />
                        <f:param name="sortOrder" value="#{param.sortOrder}" />
                        <f:param name="orderColumn" value="#{param.orderColumn}" />             
                </h:commandLink>
            </span>
            <span>
                <h:commandLink title="Go to page prev page">
                    <h:outputText value="prev"></h:outputText>
                        <f:param name="pageNo" value="#{transactions_byaccount.prevPage}" />
                        <f:param name="accountId" value="#{param.accountId}" />
                        <f:param name="sortOrder" value="#{param.sortOrder}" />
                        <f:param name="orderColumn" value="#{param.orderColumn}" />
                </h:commandLink>

            </span>
                <ui:repeat value="#{transactions_byaccount.pages}" var="item">
                    <span style="font-weight: #{item == transactions_byaccount.currentPageNo ? 'bold' : 'lighter' }">
                        <h:commandLink>
                            <h:outputText value="#{item}"></h:outputText>
                            <f:param name="pageNo" value="#{item}" />
                            <f:param name="accountId" value="#{param.accountId}" />
                            <f:param name="sortOrder" value="#{param.sortOrder}" />
                            <f:param name="orderColumn" value="#{param.orderColumn}" />

                        </h:commandLink>
                    </span>
                </ui:repeat>                

            <span>
                <h:commandLink title="Go to page next page">
                    <h:outputText value="next"></h:outputText>
                        <f:param name="pageNo" value="#{transactions_byaccount.nextPage}" />
                        <f:param name="accountId" value="#{param.accountId}" />
                        <f:param name="sortOrder" value="#{param.sortOrder}" />
                        <f:param name="orderColumn" value="#{param.orderColumn}" />
                </h:commandLink>
            </span>
            <span>
                <h:commandLink title="Go to page last page">
                    <h:outputText value="last"></h:outputText>
                        <f:param name="pageNo" value="#{transactions_byaccount.lastPage}" />
                        <f:param name="accountId" value="#{param.accountId}" />
                        <f:param name="sortOrder" value="#{param.sortOrder}" />
                        <f:param name="orderColumn" value="#{param.orderColumn}" />

                </h:commandLink>                
            </span>         
        </div>
        <div class="currentPagerIndex">

        </div>
    </ui:define>
    <ui:define name="maincontent">
        <table class="datatable">
            <thead>
                <tr class="headRow">
                    <td>datetransaction</td>
                    <td>description</td>
                    <td>amount</td>
                    <td>Edit</td>
                    <td>Delete</td>
                </tr>
            </thead>
            <ui:repeat value="#{transactions_byaccount.pageList}" var="item">
                <tr class="dataRow">
                    <td class="dataCell cltdtransactionsdatetransaction">
                          <h:outputText value="#{item.datetransaction}" >
                            <f:convertDateTime pattern="EEE dd-MMM-yyyy HH:mm" />
                          </h:outputText>
                    </td>
                    <td class="dataCell cltdtransactionsdescription">#{item.description}</td>
                    <td class="dataCell cltdtransactionsamount">#{item.amount}</td>
                    <td style="width: 45px">
                        <span class="pagerDBspan" style="font-weight: bold;">                   
                            <h:link outcome="transactions_edit" style="font-weight: bold;">
                                <h:outputText value="Edit"></h:outputText>
                                <f:param name="pageNo" value="#{param.pageNo}" />
                                <f:param name="itemId" value="#{item.id}" />
                            </h:link>
                        </span>                 
                    </td>
                    <td style="width: 45px">
                        <span class="pagerDBspan" style="font-weight: bold;">
                            <h:link  outcome="transactions_edit" >
                                <h:outputText value="Delete"></h:outputText>
                                <f:param name="pageNo" value="#{param.pageNo}" />
                                <f:param name="itemId" value="#{item.id}" />
                                <f:param name="deleteFlag" value="true" />                                  
                            </h:link>       
                        </span>                 
                    </td>
                </tr>
                <tr class="dataRow">
                    <td class="dataCell"></td>
                    <td class="dataCell" colspan="2">
                        <h:selectOneMenu value="#{item.fkCategoriesId}" >
                            <f:selectItems value="#{categories_edit.categories}"/>
                        </h:selectOneMenu>
                    </td>
                    <td colspan="2">
                        <span class="pagerDBspan" style="font-weight: bold;">
                            <h:commandLink action="#{transactions_byaccount.updateCategory('', item)}" >
                                <h:outputText value="Update"></h:outputText>        
                                <f:param name="pageNo" value="#{param.pageNo}" />
                                <f:param name="accountId" value="#{param.accountId}" />
                                <f:param name="sortOrder" value="#{param.sortOrder}" />
                                <f:param name="orderColumn" value="#{param.orderColumn}" />                                                                         
                            </h:commandLink>
                        </span>                                         
                    </td>
                </tr>
                <tr>
                    <td class="cssBottomLine" colspan="0"></td>
                </tr>                   
            </ui:repeat>
        </table>
    </ui:define>

    <ui:define name="bottomoperationalbarhost">
    </ui:define>

</ui:composition>
</html>
4

1 回答 1

0

#{transactions_byaccount.pageList}当表单提交的处理过程与显示表单的过程相比发生了不兼容的变化时，就会发生这种情况。

在处理表单提交的新 HTTP 请求期间，JSF 将对其进行重复以查找调用的操作并准备#{item}传递它。请注意，这不是在呈现 HTML 表单以供显示的 HTTP 请求期间准备的。

此问题表明您正在#{transactions_byaccount.pageList}基于一个过时（或太新）的变量进行初始化，这导致它发生了不兼容的更改。你不应该那样做。您应该重写您的 bean 逻辑，使其在回发时初始化与显示期间完全相同的列表，然后仅在实际调用操作时（因此，在操作方法内部）更改它。

鉴于您使用的是视图范围的 bean，您实际上应该已经设置好，因为它实际上会记住后续请求的所有属性。也许您正在列表的 getter 方法中执行初始化。您根本不应该在 getter 方法中执行业务逻辑。您应该在（后）构造函数或操作方法中执行此操作。

于 2012-12-17T12:32:23.900 回答