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我一直在嘗試有限的成功來編寫JSF應用程序。在應用程序的一部分中，我需要用戶從顯示可選狀態值列表的選擇菜單中進行選擇。用於填充選擇菜單中顯示的List的Status類（如下所示）是一個由兩個Strings組成的簡單類：一個是用於在數據庫中查找描述的代碼，另一個是人類可讀的描述。我試圖找出是否我需要一個轉換器，如果是的話，如何最好地實現轉換器。這是使用Java 1.5這個簡單的類是否需要定製JSF轉換器？
我使用的JSP下面的代碼JSF 1.1項目：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<f:view>
<html>
<h:graphicImage id="image" url="/images/appname.jpg"
alt="app name" />
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<jsp:include page="/jsp/menu.jsp" />
</head>
<body>
<h:outputText
value="Add Value"
style="font-size:20px;" />
<h:messages errorStyle="color: red" infoStyle="color: green"
layout="table" />
<h:form id="statusReasonEditForm">
<table>
<tr>
<td><h:outputText id="txtvalue" value="Status" /></td>
<td><h:selectOneMenu id="selectStatus"
value="#{pc_statusReasonBacker.status}"
binding="#{pc_statusReasonBacker.selectItem}">
<f:selectItems value="#{pc_statusReasonBacker.selectStatuses}" />
<f:converter converterId="statusConverter" />
</h:selectOneMenu>
<td><h:outputText id="txtvaluereason" value="Status Reason" /></td>
<td><h:inputText id="txtinputreason"
value="#{pc_statusReasonBacker.statusReason.statusReason}"
maxlength="100" size="40" /></td>
<td><h:outputText id="txtvaluereasondesc"
value="Status Reason Desc" /></td>
<td><h:inputText id="txtinputreasondesc"
value="#{pc_statusReasonBacker.statusReason.statusReasonDesc}"
maxlength="100" size="40" /></td>
</tr>
</table>
<tr>
<td><h:commandButton id="savebutton" value="Save"
action="#{pc_statusReasonBacker.save}" /></td>
<td><h:commandButton id="cancelbutton" value="Cancel"
action="#{pc_statusReasonBacker.cancel}" /></td>
</tr>
</h:form>
<hr />
</body>
</html>
</f:view>
的支持bean如下所示（一些非相關的部分，如分頁，取消了清晰）：
公共類StatusReasonBacker {
private List<StatusReason> statusReasonList;
private List<Status> statusList;
private List<SelectItem> selectStatuses;
private StatusReason statusReason;
private StatusDao sDao;
private Status status;
private UIData statusReasonTable;
private HtmlSelectOneMenu selectItem;
private String selectedStatus = "";
public StatusReasonBacker() {
sDao = new StatusDao();
statusReason = new StatusReason();
selectStatuses = new ArrayList<SelectItem>();
status = new Status();
selectItem = new HtmlSelectOneMenu();
}
public String insert() {
status.setStatusCde("");
statusReason.setStatus(status);
statusReason.setStatusReason("");
statusReason.setStatusReasonCde("");
statusReason.setStatusReasonDesc("");
return "success";
}
public String edit() {
this.statusReason = (StatusReason) statusReasonTable.getRowData();
selectItem.setValue(statusReason.getStatus().getStatusCde());
return "success";
}
public String update() {
if ("".equalsIgnoreCase(statusReason.getStatusReason().trim())) {
Message
.addErrorMessage("You must enter a value for the status reason.");
return "failure";
} else if (("".equalsIgnoreCase(statusReason.getStatusReasonDesc()
.trim()))) {
Message
.addErrorMessage("You must enter a value for the status reason description.");
return "failure";
}
sDao.updateStatusReason(statusReason);
return "statusreasons";
}
public String delete() {
StatusReason statReason = (StatusReason) statusReasonTable.getRowData();
sDao.deleteStatusReason(statReason);
return "statusreasons";
}
public String cancel() {
return "statusreasons";
}
public String save() {
statusReason.setStatus(status);
sDao.insertStatusReason(statusReason);
return "statusreasons";
}
...
public StatusDao getSDao() {
return sDao;
}
public void setSDao(StatusDao dao) {
sDao = dao;
}
public List<StatusReason> getStatusReasonList() {
statusReasonList = sDao.getStatusReasons();
return statusReasonList;
}
public void setStatusReasonList(List<StatusReason> statusReasonList) {
this.statusReasonList = statusReasonList;
}
public UIData getStatusReasonTable() {
return statusReasonTable;
}
public void setStatusReasonTable(UIData statusReasonTable) {
this.statusReasonTable = statusReasonTable;
}
public StatusReason getStatusReason() {
return statusReason;
}
public void setStatusReason(StatusReason statusReason) {
this.statusReason = statusReason;
}
public List<Status> getStatusList() {
statusList = sDao.getStatuses();
return statusList;
}
public void setStatusList(List<Status> statusList) {
this.statusList = statusList;
}
public List<SelectItem> getSelectStatuses() {
selectStatuses.clear();
if (statusList == null) {
statusList = this.getStatusList();
}
for (Status sr : statusList) {
SelectItem si = new SelectItem();
si.setValue(sr.getStatusCde());
si.setLabel(sr.toString());
si.setDescription(sr.toString());
selectStatuses.add(si);
}
return selectStatuses;
}
public void setSelectStatuses(List<SelectItem> selectStatuses) {
this.selectStatuses = selectStatuses;
}
public String getSelectedStatus() {
selectedStatus = statusReason.getStatusDesc();
return selectedStatus;
}
public void setSelectedStatus(String selectedStatus) {
this.selectedStatus = selectedStatus;
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
public HtmlSelectOneMenu getSelectItem() {
return selectItem;
}
public void setSelectItem(HtmlSelectOneMenu selectItem) {
this.selectItem = selectItem;
}
}
謝謝！