本文整理了Java中javax.faces.convert.Converter类的一些代码示例，展示了Converter类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Converter类的具体详情如下：
包路径：javax.faces.convert.Converter
类名称：Converter

Converter介绍

[英]Converter is an interface describing a Java class that can perform Object-to-String and String-to-Object conversions between model data objects and a String representation of those objects that is suitable for rendering.

Converter implementations must have a zero-arguments public constructor. In addition, if the Converter class wishes to have configuration property values saved and restored with the component tree, the implementation must also implement StateHolder.

Starting with version 1.2 of the specification, an exception to the above zero-arguments constructor requirement has been introduced. If a converter has a single argument constructor that takes a Class instance and the Class of the data to be converted is known at converter instantiation time, this constructor must be used to instantiate the converter instead of the zero-argument version. This enables the per-class conversion of Java enumerated types.

If any Converter implementation requires a java.util.Locale to perform its job, it must obtain that Locale from the javax.faces.component.UIViewRootof the current FacesContext, unless the Converter maintains its own Locale as part of its state.

If the class implementing Converter has a javax.faces.application.ResourceDependency annotation, the action described in ResourceDependency must be taken when javax.faces.component.ValueHolder#setConverter is called. If the class implementing Converter has a javax.faces.application.ResourceDependencies annotation, the action described in ResourceDependencies must be taken when javax.faces.component.ValueHolder#setConverter is called.
[中]

代码示例

代码示例来源：origin: primefaces/primefaces

Converter converter = uicalendar.getConverter();
if (converter != null) {
  return converter.getAsObject(context, uicalendar, submittedValue);
ValueExpression ve = uicalendar.getValueExpression("value");
if (ve != null) {
  Class type = ve.getType(context.getELContext());
  if (type != null && type != Object.class && type != Date.class) {
    Converter converter = context.getApplication().createConverter(type);
    if (converter != null) {
      return converter.getAsObject(context, uicalendar, submittedValue);

代码示例来源：origin: primefaces/primefaces

public static final String getValue(FacesContext context, UICalendar calendar, Object value, String pattern) {
  //first ask the converter
  if (calendar.getConverter() != null) {
    return calendar.getConverter().getAsString(context, calendar, value);
  }
  else if (value instanceof String) {
    return (String) value;
  }
  //Use built-in converter
  else if (value instanceof Date) {
    SimpleDateFormat format = new SimpleDateFormat(pattern, calendar.calculateLocale(context));
    format.setTimeZone(calculateTimeZone(calendar.getTimeZone()));
    return format.format((Date) value);
  }
  else {
    //Delegate to global defined converter (e.g. joda or java8)
    ValueExpression ve = calendar.getValueExpression("value");
    if (ve != null) {
      Class type = ve.getType(context.getELContext());
      if (type != null && type != Object.class && type != Date.class) {
        Converter converter = context.getApplication().createConverter(type);
        if (converter != null) {
          return converter.getAsString(context, calendar, value);
        }
      }
    }
    throw new FacesException("Value could be either String or java.util.Date");
  }
}

代码示例来源：origin: com.sun.faces/jsf-impl

public void applyAttachedObject(FacesContext context, UIComponent parent) {
  FaceletContext ctx = (FaceletContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);
  // cast to a ValueHolder
  ValueHolder vh = (ValueHolder) parent;
  ValueExpression ve = null;
  Converter c = null;
  if (owner.getBinding() != null) {
    ve = owner.getBinding().getValueExpression(ctx, Converter.class);
    c = (Converter) ve.getValue(ctx);
  }
  if (c == null) {
    c = this.createConverter(ctx);
    if (ve != null) {
      ve.setValue(ctx, c);
    }
  }
  if (c == null) {
    throw new TagException(owner.getTag(), "No Converter was created");
  }
  owner.setAttributes(ctx, c);
  vh.setConverter(c);
  Object lv = vh.getLocalValue();
  FacesContext faces = ctx.getFacesContext();
  if (lv instanceof String) {
    vh.setValue(c.getAsObject(faces, parent, (String) lv));
  }
}

代码示例来源：origin: primefaces/primefaces

protected void encodeSuggestionsAsList(FacesContext context, AutoComplete ac, List items, Converter converter) throws IOException {
  ResponseWriter writer = context.getResponseWriter();
  String var = ac.getVar();
  Map<String, Object> requestMap = context.getExternalContext().getRequestMap();
  boolean pojo = var != null;
  UIComponent itemtip = ac.getFacet("itemtip");
        String value = converter == null ? String.valueOf(ac.getItemValue()) : converter.getAsString(context, ac, ac.getItemValue());
        writer.writeAttribute("data-item-value", value, null);
        writer.writeAttribute("data-item-label", ac.getItemLabel(), null);
      if (itemtip != null && itemtip.isRendered()) {
        writer.startElement("li", null);
        writer.writeAttribute("class", AutoComplete.ITEMTIP_CONTENT_CLASS, null);
        itemtip.encodeAll(context);
        writer.endElement("li");

代码示例来源：origin: com.evasion/COMMON

Converter converter = valueHolder.getConverter();
if(converter != null) {
  return converter.getAsString(facesContext, component, value);
  ValueExpression expr = component.getValueExpression("value");
  if(expr != null) {
    Class<?> valueType = expr.getType(facesContext.getELContext());
    Converter converterForType = facesContext.getApplication().createConverter(valueType);
      return converterForType.getAsString(facesContext, component, value);

代码示例来源：origin: javax/javaee-web-api

private static String stringValue(UIComponent component,
                 Long toConvert,
                 FacesContext context) {
  Converter converter =
     context.getApplication().createConverter("javax.faces.Number");
  return converter.getAsString(context, component, toConvert);
}

代码示例来源：origin: org.richfaces.ui.core/richfaces-ui-core-ui

public void processAction(ActionEvent actionEvent) throws AbortProcessingException {
  FacesContext context = getFacesContext();
  ELContext elContext = context.getELContext();
  ValueExpression updateBinding = getAssignToExpression();
  if (updateBinding != null && (!updateBinding.isReadOnly(elContext))) {
    String requestValue = context.getExternalContext().getRequestParameterMap().get(getName());
    Object convertedValue = requestValue;
    if (requestValue != null) {
      Class<?> type = updateBinding.getType(elContext);
      Converter converter = createConverter(context, type);
      if (null != converter) {
        convertedValue = converter.getAsObject(context, this, requestValue);
      }
    }
    if (null != convertedValue) {
      updateBinding.setValue(elContext, convertedValue);
    }
  }
}

代码示例来源：origin: org.glassfish/javax.faces

/**
 * Convert an object of type targetClass to text by delegating to a converter obtained from the
 * Faces application.
 */
public String convertToString(Class<?> targetClass, Object value) {
  UIComponent component = getComponent();
  Converter converter = app.createConverter(targetClass);
  if (null == converter) {
    // PENDING(edburns): I18N
    throw new FacesException("Cannot create Converter to convert " + targetClass.getName() + " value " + value + " to string.");
  }
  FacesContext currentInstance = FacesContext.getCurrentInstance();
  try {
    return converter.getAsString(currentInstance, component, value);
  } catch (ConverterException ce) {
    addConversionErrorMessage(currentInstance, component, ce);
    return null;
  }
}

代码示例来源：origin: primefaces/primefaces

Object value = valueHolder.getValue();
if (value == null) {
  return "";
Converter converter = valueHolder.getConverter();
if (converter == null) {
  Class valueType = value.getClass();
  converter = context.getApplication().createConverter(valueType);
      throw new FacesException("Value of " + component.getClientId(context) + " must be a List or an Array.");
    for (int i = 0; i < collectionSize; i++) {
      Object object = collection.get(i);
      builder.append(converter.getAsString(context, component, object));
    return converter.getAsString(context, component, value);
return (String) component.getAttributes().get("alt");

代码示例来源：origin: org.glassfish/jakarta.faces

/**
 * Convert the <code>textValue</code> to an object of type targetClass by delegating to a
 * converter.
 */
public Object convertToObject(Class<?> targetClass, String textValue) {
  UIComponent component = getComponent();
  Converter converter = app.createConverter(targetClass);
  if (null == converter) {
    // PENDING(edburns): I18N
    FacesException e = new FacesException(
        "Cannot create Converter to convert value " + textValue + " to instance of target class " + targetClass.getName() + '.');
    throw e;
  }
  FacesContext currentInstance = FacesContext.getCurrentInstance();
  try {
    return converter.getAsObject(currentInstance, component, textValue);
  } catch (ConverterException ce) {
    addConversionErrorMessage(currentInstance, component, ce);
    return null;
  }
}

代码示例来源：origin: org.icefaces/icefaces-compat

StringBuffer str = new StringBuffer();
if (uic instanceof CommandSortHeader) {
  if (uic.getChildCount() > 0) {
    Iterator iter = uic.getChildren().iterator();
    while (iter.hasNext()) {
      UIComponent child = (UIComponent) iter.next();
Object value = uic.getAttributes().get("value");
if (value == null) {
  ValueBinding vb = uic.getValueBinding("value");
  converter = ((ValueHolder)uic).getConverter();
  converter = FacesContext.getCurrentInstance().getApplication().createConverter(value.getClass());
  str.append(converter.getAsString(FacesContext.getCurrentInstance(), uic, value));
} else {
  str.append(value);

代码示例来源：origin: org.richfaces/richfaces

public static Locale getAsLocale(FacesContext facesContext, AbstractCalendar calendar, Object locale) {
  if (calendar == null || facesContext == null) {
    return null;
  }
  Locale localeValue = null;
  if (locale instanceof Locale) {
    localeValue = (Locale) locale;
  } else if (locale instanceof String) {
    localeValue = parseLocale((String) locale);
  } else if (locale != null) {
    Application application = facesContext.getApplication();
    Converter converter = application.createConverter(locale.getClass());
    if (null != converter) {
      localeValue = parseLocale(converter.getAsString(facesContext, calendar, locale));
    } else {
      throw new FacesException("Wrong locale attibute type or there is no converter for custom attibute type");
    }
  }
  return localeValue;
}

代码示例来源：origin: org.omnifaces/omnifaces

ValueExpression valueExpression = component.getValueExpression("value");
  Method getter = ExpressionInspector.getMethodReference(context.getELContext(), valueExpression).getMethod();
  Class<?> returnType = getter.getReturnType();
    throw new IllegalArgumentException(valueExpression.getExpressionString() + " does not resolve to Collection.");
      converter = context.getApplication().createConverter(forClass);
  collection.add(converter == null ? trimmed : converter.getAsString(context, component, trimmed));

代码示例来源：origin: primefaces/primefaces

Object obj = calendar.getConverter().getAsObject(context, calendar, value.toString());
    if (obj instanceof Date) {
      return (Date) obj;
Converter converter = context.getApplication().createConverter(value.getClass());
if (converter != null) {
  Object obj = converter.getAsObject(context, calendar, value.toString());
  if (obj instanceof Date) {
    return (Date) obj;
throw new FacesException("Value could be either String or java.util.Date");

代码示例来源：origin: org.apache.myfaces.tobago/tobago-core

Converter converter = ((ValueHolder) component).getConverter();
if (converter == null) {
 final ValueExpression expression = component.getValueExpression("value");
 if (expression != null) {
  final Class valueType = expression.getType(facesContext.getELContext());
  if (valueType != null) {
   converter = facesContext.getApplication().createConverter(valueType);
 converter.getAsObject(facesContext, component, stringValue);

代码示例来源：origin: org.icefaces/icefaces-compat

public Object getConvertedValue(FacesContext facesContext, UIComponent
    uiComponent, Object submittedValue) throws ConverterException {
  // get the converter (if any) registered with this component 
  Converter converter = null;
  if (uiComponent instanceof ValueHolder) {
    converter = ((ValueHolder) uiComponent).getConverter();
  }
  // if we didn't find a converter specifically registered with the component
  // then get the default converter for the type of the value binding,
  // if it exists
  ValueBinding valueBinding = uiComponent.getValueBinding("value");
  if (converter == null && valueBinding != null) {
    Class valueBindingClass = valueBinding.getType(facesContext);
    if (valueBindingClass != null) {
      converter = facesContext.getApplication()
          .createConverter(valueBindingClass);
    }
  }
  if (converter != null) {
    return converter.getAsObject(facesContext, uiComponent,
        (String) submittedValue);
  } else if (submittedValue != null) {
    return (String) submittedValue;
  } else {
    return null;
  }
}

代码示例来源：origin: primefaces/primefaces

&& submittedValue == null
    && !input.isLocalValueSet()
    && context.isValidationFailed()
    && !input.isValid()) {
  return null;
value = valueHolder.getValue();
Converter converter = valueHolder.getConverter();
if (converter == null) {
  Class valueType = value.getClass();
  converter = context.getApplication().createConverter(valueType);
  return converter.getAsString(context, component, value);

代码示例来源：origin: primefaces/primefaces

protected void encodeMultipleMarkup(FacesContext context, AutoComplete ac) throws IOException {
  ResponseWriter writer = context.getResponseWriter();
  String clientId = ac.getClientId(context);
  String inputId = clientId + "_input";
        context.getExternalContext().getRequestMap().put(var, value);
        itemValue = ac.getItemValue();
        itemLabel = ac.getItemLabel();
      String tokenValue = converter != null ? converter.getAsString(context, ac, itemValue) : String.valueOf(itemValue);
      String itemStyleClass = AutoComplete.TOKEN_DISPLAY_CLASS;
      if (ac.getItemStyleClass() != null) {

代码示例来源：origin: primefaces/primefaces

@Override
public void decode(FacesContext context, UIComponent component) {
  ColorPicker colorPicker = (ColorPicker) component;
  if (!shouldDecode(colorPicker)) {
    return;
  }
  String paramName = colorPicker.getClientId(context) + "_input";
  Map<String, String> params = context.getExternalContext().getRequestParameterMap();
  if (params.containsKey(paramName)) {
    String submittedValue = params.get(paramName);
    if (!COLOR_HEX_PATTERN.matcher(submittedValue).matches()) {
      return;
    }
    Converter converter = colorPicker.getConverter();
    if (converter != null) {
      colorPicker.setSubmittedValue(
          converter.getAsObject(context, component, submittedValue));
    }
    else {
      colorPicker.setSubmittedValue(submittedValue);
    }
  }
}

代码示例来源：origin: com.github.albfernandez.richfaces/richfaces-core

public void invokeContextCallback(FacesContext context, UIComponent target) {
  component = target;
  Converter rowKeyConverter = (Converter) target.getAttributes().get("rowKeyConverter");
  Collection<?> keys = (Collection<?>) context.getApplication().evaluateExpressionGet(context, "#{" + image + "}",
    Object.class);
  if (keys == null) {
    return;
  }
  for (Object key : keys) {
    String convertedKey;
    if (rowKeyConverter != null) {
      convertedKey = rowKeyConverter.getAsString(context, target, key);
    } else {
      convertedKey = key.toString();
    }
    convertedKeys.add(convertedKey);
  }
}