Question

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);
}

Answer 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！

Answer 2

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

富人：pickList＆amp; selectManyListbox - JSF Converter Validation Error：值无效

2 个答案: