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在我单击命令链接后，无法完全弄清楚为什么数据表中的所有现有项目都被重置为 new Item()。这个应用程序为用户提供了一个联系人列表以及一个编辑（commandlink）按钮，用户可以单击该按钮将所选项目更改为编辑模式。当我单击命令链接时，它会调用 bean 的 edit() 并且 getRowData() 正在获取预期的行。但是该行中的现有数据在某种程度上是空白的（确切地说是新的 MSAMContactJTO()）。事实上，数据表中的所有现有行都显示如何被重置为空白。

下面是xhtml：

<!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:f="http://java.sun.com/jsf/core" 
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:t="http://myfaces.apache.org/tomahawk"
  xmlns:c="http://java.sun.com/jstl/core">

<!-- saved from url=(0049)http://usmodev/my_send_a_message/address_book.htm -->
<h:head><title>My Send a Message</title>
</h:head> 

<h:body>  

<h:form id="addressBookForm" prependId="false">
  <h:dataTable id="contactListTable" border="0" cellspacing="0" cellpadding="0" 
    value="#{MSAMAddressBook2ListBean.contactListTable}"
    rendered="#{not empty MSAMAddressBook2ListBean.contactList}"  
    var="item">

    <h:column>
      <h:panelGrid id="contactNameColumn" >
        <h:panelGroup style="text-align:left; white-space:nowrap;" rendered="#{!item.editMode    and !item.newAdd}">
          <h:outputText value="#{item.contactName}"/>
        </h:panelGroup>
       <h:panelGroup style="text-align:left; white-space:nowrap;" rendered="#{item.editMode || item.newAdd}">
         <h:inputText  id="contactName" value="#{item.contactName}" maxlength="30" size="30" />
       </h:panelGroup>
      </h:panelGrid>

    </h:column>

    <h:column>
      <h:panelGrid id="actionColumn" cellpadding="0" cellspacing="0">
      <h:commandLink id="editContact" action="#{MSAMAddressBook2ListBean.edit}"  value="EDIT"/>
        <!-- f:ajax event="action" execute="@form" render="contactListTable"/ -->
      </h:panelGrid>    
    </h:column>
  </h:dataTable>
</h:form> 

</h:body>
</html>

下面是管理bean：

package com.arch.myaccount.jsf;

import java.io.Serializable;
import java.util.List;
import java.util.ArrayList;

import com.arch.database.myaccount.MSAMAddressBookDatabase;
import com.arch.myaccount.MSAMContactDTO;

import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.annotation.PostConstruct;

@SuppressWarnings("serial")
@ManagedBean(name="MSAMAddressBook2ListBean")
@ViewScoped
public class MSAMAddressBook2ListBean extends JSFBean implements Serializable 
{

    // table list info
    private transient DataModel<MSAMContactJTO> contactListTable;
    private ArrayList<MSAMContactJTO> contactList = null;

    @PostConstruct
    public void init() {
        getContactList();
    }

    public String edit() {

        String result = "successful";

        MSAMContactJTO item = getContactListTable().getRowData();
        item.setEditMode(true);

        return result;
    }


    public List<MSAMContactJTO> getContactList() {
        if (contactList == null) {
        try {
             loadContactList();
        }
        catch (Exception ex) {}
        }

        return contactList;
    }

    public void loadContactList() {

        try {
            List<MSAMContactDTO> contacts = new MSAMAddressBookDatabase().findContactsByLoginName(getLoginID());
            if (contactList == null) contactList = new ArrayList<MSAMContactJTO>(); 
            else contactList.clear();

            for (MSAMContactDTO contact :contacts) {
                MSAMContactJTO abDTO = new MSAMContactJTO();
                abDTO.copyFromMSAMContactDTO(contact);
                contactList.add(abDTO);
            }


        }
        catch (Exception ex) {
            addFatalMessage("We are unable to fulfill your request.  Please try again later");
            ex.printStackTrace();
        }
    }


    public DataModel<MSAMContactJTO> getContactListTable() {
        if (contactListTable == null) {
            contactListTable = new ListDataModel<MSAMContactJTO>(contactList);
        }
            return contactListTable;
    }

    public void setContactList(ArrayList<MSAMContactJTO> contactList) {
        this.contactList = contactList;
    }
}
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