以编程方式创建表单和验证，未处理的面消息

Question

我使用Apache MyFaces库创建了一个表单。形式与jsf页面通过绑定。此外，我还构建了一个testvalidator类来实现验证器接口。我的表单被显示出来，我输入我的输入，验证得到成功触发。不幸的是，我不能显示相应的FacesMessage。我猜我不能告诉JSF"请呈现h:消息"在抛出验证器异常之后。

出什么事了?提前谢谢。

@FacesValidator("TestValidator") // class TestValidator
public class TestValidator implements Validator {
    @Override
    public void validate(FacesContext context, UIComponent uiComponent, Object value) throws ValidatorException {
        System.out.println("TestValidator.validate: " + value);
        if (((String) value).equals("2")){
            FacesMessage fm = new FacesMessage();
            fm.setSeverity(FacesMessage.SEVERITY_ERROR);
            fm.setSummary("TestValidator FEHLER");
            fm.setDetail("TestValidator FEHLER");
            throw new ValidatorException(fm); 
        }
    }
}
<!-- JSF-Snippet -->
<t:div id="formContainer" binding="#{formsbuilder.form}" />
private Div createFacesMessagesDiv() { // FormsBuilder-Bean-Snippet for creating the container for the FacesMessage
    facesMessagesDiv = new Div(); // CORRESPONDING BEAN PROPERTY
    facesMessagesDiv.setId("facesMessagesContainer");
    facesMessagesDiv.setStyle("color: blue; border: 3px solid green;");
    HtmlOutputText introText = new HtmlOutputText();
    introText.setId("facesMessagesIntroText");
    introText.setValue("FacesMessages - Start: ");
    facesMessagesDiv.getChildren().add(introText);
    HtmlMessages fms = new HtmlMessages();
    fms.setId("facesMessages");
    facesMessagesDiv.getChildren().add(fms);
    HtmlOutputText outroText = new HtmlOutputText();
    outroText.setId("facesMessagesOutroText");
    outroText.setValue("FacesMessages - Ende!");
    facesMessagesDiv.getChildren().add(outroText);
    return facesMessagesDiv;
}
private HtmlAjaxCommandLink createSaveFormButton() { // saveButton after hitting this button, facesMessages should show up;
    HtmlAjaxCommandLink saveFormButton = HtmlRendering.createGeneralButton("saveForm" + currentSubForm.getIdAsString(), /* ID */
    "#{resources.labels['formsgenerator_saveForm']}",
    "#{formsbuilder.submitForm}",
    null, /* action */
    null, /* actionReturnType */
    null, /* onComplete */
    "", /* styleClassValueExpression */
    "", /* imageValue */
    "modifiedContainerDiv");
    saveFormButton.setReRender(facesMessagesDiv); // CORRESPONDING BEAN PROPERTY
saveFormButton.setValueExpression("oncomplete", HtmlRendering.createValueExpression("afterGeneralSavingSubForm()");
return saveFormButton;
}

Answer 1

看起来您没有正确设置消息。

你忘了把FacesMessage添加到FacesContext。

试试这个:

public void validate(FacesContext context, UIComponent uiComponent, Object value) throws ValidatorException {
    System.out.println("TestValidator.validate: " + value);
    if (((String) value).equals("2")){
        FacesMessage fm = new FacesMessage();
        fm.setSeverity(FacesMessage.SEVERITY_ERROR);
        fm.setSummary("TestValidator FEHLER");
        fm.setDetail("TestValidator FEHLER");
        FacesContext.getCurrentInstance().addMessage(null, fm);
        throw new ValidatorException(fm); 
    }
}

下面是编写FacesMessage的更简洁的方法:

public void validate(FacesContext context, UIComponent uiComponent, Object value) throws ValidatorException {
    System.out.println("TestValidator.validate: " + value);
    if (((String) value).equals("2")){
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "TestValidator FEHLER", "TestValidator FEHLER"));
        throw new ValidatorException(fm); 
    }
}