answer by Alim Özdemir :

binder.forField(textFieldForNumber)
      .withValidator(new RegexpValidator("Only 1-9 allowed","\\d*"))
      .bind(YourEntity::getNo, YourEntity::setNo);

客户端

也有可能在客户端使用 textField.setPattern(..) 方法,例如:

textFieldForNumber.setPattern("\\d*");

此外,还可以通过以下方式防止输入与模式不匹配:

textFieldForNumber.setPreventInvalidInput(true);

备用小部件: NumberField

第三种选择是使用 NumberField

你可以用活页夹在现场进行验证

binder.forField(textFieldForNumber)
      .withValidator(new RegexpValidator("Only 1-9 allowed","\\d*"))
      .bind(YourEntity::getNo, YourEntity::setNo);

我找到了答案的解决方案,我在Vaadin的新beta版本中提取了整数文本字段的源代码

代码如下

@Tag("vaadin-integer-field")
@HtmlImport("frontend://bower_components/vaadin-text-field/src/vaadin-integer-field.html")
@JsModule("@vaadin/vaadin-text-field/src/vaadin-integer-field.js")
public class BigIntegerField extends AbstractNumberField<BigIntegerField, BigInteger> {

    private static final SerializableFunction<String, BigInteger> PARSER = valueFormClient -> {
        if (valueFormClient == null || valueFormClient.isEmpty()) {
            return null;
        }
        try {
            return new BigInteger(valueFormClient);
        } catch (NumberFormatException e) {
            return null;
        }
    };

    private static final SerializableFunction<BigInteger, String> FORMATTER = valueFromModel -> valueFromModel == null
            ? ""
            : valueFromModel.toString();

    /**
     * Constructs an empty {@code IntegerField}.
     */
    public BigIntegerField() {

          super(PARSER, FORMATTER, Double.MIN_VALUE, Double.MAX_VALUE);
  //      super(PARSER, FORMATTER, new BigInteger(String.valueOf(Integer.MIN_VALUE)), new BigInteger(String.valueOf(Integer.MAX_VALUE)));
    }

    /**
     * Constructs an empty {@code IntegerField} with the given label.
     *
     * @param label
     *            the text to set as the label
     */
    public BigIntegerField(String label) {
        this();
        setLabel(label);
    }

    /**
     * Constructs an empty {@code IntegerField} with the given label and
     * placeholder text.
     *
     * @param label
     *            the text to set as the label
     * @param placeholder
     *            the placeholder text to set
     */
    public BigIntegerField(String label, String placeholder) {
        this(label);
        setPlaceholder(placeholder);
    }

    /**
     * Constructs an empty {@code IntegerField} with a value change listener.
     *
     * @param listener
     *            the value change listener
     *
     * @see #addValueChangeListener(ValueChangeListener)
     */
    public BigIntegerField(
            ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
        this();
        addValueChangeListener(listener);
    }

    /**
     * Constructs an empty {@code IntegerField} with a value change listener and
     * a label.
     *
     * @param label
     *            the text to set as the label
     * @param listener
     *            the value change listener
     *
     * @see #setLabel(String)
     * @see #addValueChangeListener(ValueChangeListener)
     */
    public BigIntegerField(String label,
            ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
        this(label);
        addValueChangeListener(listener);
    }

    /**
     * Constructs a {@code IntegerField} with a value change listener, a label
     * and an initial value.
     *
     * @param label
     *            the text to set as the label
     * @param initialValue
     *            the initial value
     * @param listener
     *            the value change listener
     *
     * @see #setLabel(String)
     * @see #setValue(Object)
     * @see #addValueChangeListener(ValueChangeListener)
     */
    public BigIntegerField(String label, BigInteger initialValue,
            ValueChangeListener<? super ComponentValueChangeEvent<BigIntegerField, BigInteger>> listener) {
        this(label);
        setValue(initialValue);
        addValueChangeListener(listener);
    }

    /**
     * Sets the minimum value of the field. Entering a value which is smaller
     * than {@code min} invalidates the field.
     * 
     * @param min
     *            the min value to set
     */
    public void setMin(int min) {
        super.setMin(min);
    }

    /**
     * Gets the minimum allowed value of the field.
     *
     * @return the min property of the field
     * @see #setMin(int)
     */
    public int getMin() {
        return (int) getMinDouble();
    }

    /**
     * Sets the maximum value of the field. Entering a value which is greater
     * than {@code max} invalidates the field.
     *
     * @param max
     *            the max value to set
     */
    public void setMax(int max) {
        super.setMax(max);
    }

    /**
     * Gets the maximum allowed value of the field.
     *
     * @return the max property of the field
     * @see #setMax(int)
     */
    public int getMax() {
        return (int) getMaxDouble();
    }

    /**
     * Sets the allowed number intervals of the field. This specifies how much
     * the value will be increased/decreased when clicking on the
     * {@link #setHasControls(boolean) control buttons}. It is also used to
     * invalidate the field, if the value doesn't align with the specified step
     * and {@link #setMin(int) min} (if specified by user).
     * 
     * @param step
     *            the new step to set
     * @throws IllegalArgumentException
     *             if the argument is less or equal to zero.
     */
    public void setStep(int step) {
        if (step <= 0) {
            throw new IllegalArgumentException("The step cannot be less or equal to zero.");
        }
        super.setStep(step);
    }

    /**
     * Gets the allowed number intervals of the field.
     *
     * @return the step property of the field
     * @see #setStep(int)
     */
    public int getStep() {
        return (int) getStepDouble();
    }

}