我将rich：pickList替换为selectManyListbox进行测试，当向服务器提交值时，它仍显示错误：“验证错误：值无效”。我还设置断点来调试StaffConverter（getAsobject），但系统从不调用它。请让我知道我的转换器从未调用的一些原因，并建议我如何解决这个问题。感谢
xhtml文件：
<h:selectManyListbox value="#{reportController.selectedStaffList}" converter="staffConverter">
<f:selectItems value="#{reportController.staffList}"
var="item" itemValue="#{item}" itemLabel="#{item.name}" />
</h:selectManyListbox>
<rich:pickList value="#{reportController.selectedStaffList}" converter="staffConverter" sourceCaption="Available flight" targetCaption="Selected flight" listWidth="195px" listHeight="100px" orderable="true">
<f:selectItems value="#{reportController.staffList}" var="item" itemValue="#{item}" itemLabel="#{item.name}" />
</rich:pickList>
我的转换器：
@FacesConverter(forClass = Staff.class)
public static class StaffConverter implements Converter {
public Object getAsObject(FacesContext facesContext, UIComponent component, String value) {
if (value == null || value.length() == 0) {
return null;
}
StaffController controller = StaffController.getInstance();
return controller.facade.find(Staff.class, getKey(value));
}
java.lang.Integer getKey(String value) {
java.lang.Integer key;
key = Integer.valueOf(value);
return key;
}
String getStringKey(java.lang.Integer value) {
StringBuffer sb = new StringBuffer();
sb.append(value);
return sb.toString();
}
public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
if (object == null) {
return null;
}
if (object instanceof Staff) {
Staff o = (Staff) object;
return getStringKey(o.getStaffCode());
} else {
throw new IllegalArgumentException("object " + object + " is of type " + object.getClass().getName()
+ "; expected type: " + StaffController.class.getName());
}
}
}
我在Staff：
中实现了equals方法@Override
public boolean equals(Object object) {
if (!(object instanceof Staff)) {
return false;
}
Staff other = (Staff) object;
return (this.staffCode == other.staffCode);
}
答案 0 :(得分：1)
只是想让它发布给某些人 - 就像我一样 - 喜欢在google或stackoverflow上搜索开发问题的解决方案......
我有几次这个问题，这取决于我在转换器中使用的那种pojos ......最后我想我找到了一个优雅的解决方案。 在我的例子中，我直接使用JPA实体类，因为我想保存DTO层。好吧，有些实体富有：pickList工作，其他人没有...我也跟踪它到equals方法。例如，在下面的示例中，它不适用于userGroupConverter bean。
我的解决方案只是内联覆盖equals方法，所以来自实体的那个（我经常使用lombok）是不受影响的，根本不需要改变！所以在我的转换器下面我只比较equals中的名字字段：
XHTML：
<rich:pickList id="pickListUserGroupSelection"
value="#{usersBean.selectedUserGroups}" switchByDblClick="true"
sourceCaption="Available user groups" targetCaption="Groups assigned to user"
listWidth="365px" listHeight="100px" orderable="false"
converter="#{userGroupConverter}"
disabled="#{!rich:isUserInRole('USERS_MAINTAIN')}">
<f:validateRequired disabled="true" />
<rich:validator disabled="true" />
<f:selectItems value="#{usersBean.userGroups}" var="userGroup"
itemValue="#{userGroup}"
itemLabel="#{userGroup.name}" />
<f:selectItems value="#{usersBean.selectedUserGroups}" var="userGroup"
itemValue="#{userGroup}"
itemLabel="#{userGroup.name}" />
</rich:pickList>
<rich:message for="pickListUserGroupSelection" />
转换器：
package ...;
import ...
/**
* JSF UserGroup converter.<br>
* Description:<br>
* JSF UserGroup converter for rich:pickList elements.<br>
* <br>
* Copyright: Copyright (c) 2014<br>
*/
@Named
@Slf4j
@RequestScoped // must be request scoped, as it can change every time!
public class UserGroupConverter implements Converter, Serializable {
/**
*
*/
private static final long serialVersionUID = 9057357226886146751L;
@Getter
Map<String, UserGroup> groupMap;
@Inject
MessageUtil messageUtil;
@Inject
UserGroupDao userGroupDao;
@PostConstruct
public void postConstruct() {
groupMap = new HashMap<>();
List<UserGroup> userGroups;
try {
userGroups = userGroupDao.findAll(new String[] {UserGroup.FIELD_USER_ROLE_NAMES});
if(userGroups != null) {
for (UserGroup userGroup : userGroups) {
// 20150713: for some reason the UserGroup entity's equals method is not sufficient here and causes a JSF validation error
// "Validation Error: Value is not valid". I tried this overridden equals method and now it works fine :-)
@SuppressWarnings("serial")
UserGroup newGroup = new UserGroup() {
@Override
public boolean equals(Object obj){
if (!(obj instanceof UserGroup)){
return false;
}
return (getName() != null)
? getName().equals(((UserGroup) obj).getName())
: (obj == this);
}
};
newGroup.setName(userGroup.getName());
groupMap.put(newGroup.getName(), newGroup);
}
}
} catch (DaoException e) {
log.error(e.getMessage(), e);
FacesContext fc = FacesContext.getCurrentInstance();
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Error initializing user group converter!", null);
fc.addMessage(null, message);
}
}
/*
* (non-Javadoc)
* @see javax.faces.convert.Converter#getAsObject(javax.faces.context.FacesContext, javax.faces.component.UIComponent, java.lang.String)
*/
@Override
public UserGroup getAsObject(FacesContext context, UIComponent component,
String value) {
UserGroup ug = null;
try {
ug = getGroupMap().get(value);
} catch (Exception e) {
log.error(e.getMessage(), e);
FacesContext fc = FacesContext.getCurrentInstance();
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Error converting user group!", null);
fc.addMessage(null, message);
}
return ug;
}
/*
* (non-Javadoc)
* @see javax.faces.convert.Converter#getAsString(javax.faces.context.FacesContext, javax.faces.component.UIComponent, java.lang.Object)
*/
@Override
public String getAsString(FacesContext context, UIComponent component,
Object value) {
String name = ((UserGroup) value).getName();
return name;
}
}
Brgds，玩得开心！
答案 1 :(得分：0)
感谢Brian和BalusC的帮助。我通过在selectManyListbox＆amp;中添加命名转换器来解决我的问题。丰富的：选择列表，所以他们运行良好。但通常情况下，我只使用@FacesConverter（forClass = Staff.class），并且不需要在jsf中添加命名转换器，因此它们仍然运行良好，除了selectManyListbox＆amp;富：选取列表