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## org.apache.struts2.components
Class Token

    java.lang.Object
      org.apache.struts2.components.Component
          org.apache.struts2.components.UIBean
              org.apache.struts2.components.Token

    public class Token

extends UIBean

Stop double-submission of forms.

The token tag is used to help with the "double click" submission problem. It is needed if you are using the TokenInterceptor or the TokenSessionInterceptor. The s:token tag merely places a hidden element that contains the unique token.

Examples

     <s:token />

See Also:
  `TokenInterceptor`, `TokenSessionStoreInterceptor`

Field Summary
`static String` | `TEMPLATE`

Fields inherited from class org.apache.struts2.components.UIBean
`accesskey, cssClass, cssErrorClass, cssErrorStyle, cssStyle, defaultTemplateDir, defaultUITheme, disabled, dynamicAttributes, errorPosition, id, javascriptTooltip, key, label, labelPosition, labelSeparator, name, onblur, onchange, onclick, ondblclick, onfocus, onkeydown, onkeypress, onkeyup, onmousedown, onmousemove, onmouseout, onmouseover, onmouseup, onselect, request, requiredLabel, requiredPosition, response, tabindex, template, templateDir, templateEngineManager, templateSuffix, theme, title, tooltip, tooltipConfig, tooltipCssClass, tooltipDelay, tooltipIconPath, uiThemeExpansionToken, value`

Fields inherited from class org.apache.struts2.components.Component
`actionMapper, COMPONENT_STACK, devMode, parameters, stack, standardAttributesMap, throwExceptionOnELFailure`

Constructor Summary
`Token(ValueStack stack, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)`

Method Summary
`protected void` | `evaluateExtraParams()` First looks for the token in the PageContext using the supplied name (or `TokenHelper.DEFAULT_TOKEN_NAME` if no name is provided) so that the same token can be re-used for the scope of a request for the same name.
`protected String` | `getDefaultTemplate()` A contract that requires each concrete UI Tag to specify which template should be used as a default.
`String` | `getTokenNameField()` Deprecated. Templates should use $parameters from now on, not $tag.

Methods inherited from class org.apache.struts2.components.UIBean
`addFormParameter, buildTemplateName, copyParams, enableAncestorFormCustomOnsubmit, end, ensureAttributeSafelyNotEscaped, escape, evaluateNameValue, evaluateParams, getId, getTemplate, getTemplateDir, getTheme, getTooltipConfig, getValueClassType, mergeTemplate, populateComponentHtmlId, setAccesskey, setClass, setCssClass, setCssErrorClass, setCssErrorStyle, setCssStyle, setDefaultTemplateDir, setDefaultUITheme, setDisabled, setDynamicAttributes, setErrorPosition, setId, setJavascriptTooltip, setKey, setLabel, setLabelposition, setLabelSeparator, setName, setOnblur, setOnchange, setOnclick, setOndblclick, setOnfocus, setOnkeydown, setOnkeypress, setOnkeyup, setOnmousedown, setOnmousemove, setOnmouseout, setOnmouseover, setOnmouseup, setOnselect, setRequiredLabel, setRequiredPosition, setStyle, setTabindex, setTemplate, setTemplateDir, setTemplateEngineManager, setTheme, setTitle, setTooltip, setTooltipConfig, setTooltipCssClass, setTooltipDelay, setTooltipIconPath, setUIThemeExpansionToken, setValue`

Methods inherited from class org.apache.struts2.components.Component
`addAllParameters, addParameter, altSyntax, completeExpressionIfAltSyntax, determineActionURL, determineNamespace, end, fieldError, findAncestor, findString, findString, findStringIfAltSyntax, findValue, findValue, findValue, getComponentStack, getParameters, getStack, getStandardAttributes, isValidTagAttribute, popComponentStack, setActionMapper, setDevMode, setThrowExceptionsOnELFailure, setUrlHelper, start, stripExpressionIfAltSyntax, toString, usesBody`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### TEMPLATE

    public static final String TEMPLATE

See Also:
  Constant Field Values

Constructor Detail

### Token

    public Token(ValueStack stack,
                 javax.servlet.http.HttpServletRequest request,
                 javax.servlet.http.HttpServletResponse response)

Method Detail

### getDefaultTemplate

    protected String getDefaultTemplate()

  Description copied from class: `UIBean`
  A contract that requires each concrete UI Tag to specify which template should be used as a default. For example, the CheckboxTab might return "checkbox.vm" while the RadioTag might return "radio.vm". This value not begin with a '/' unless you intend to make the path absolute rather than relative to the current theme.

  Specified by:
    `getDefaultTemplate` in class `UIBean`
  Returns:
    The name of the template to be used as the default.

### evaluateExtraParams

    protected void evaluateExtraParams()

  First looks for the token in the PageContext using the supplied name (or `TokenHelper.DEFAULT_TOKEN_NAME` if no name is provided) so that the same token can be re-used for the scope of a request for the same name. If the token is not in the PageContext, a new Token is created and set into the Session and the PageContext with the name.

  Overrides:
    `evaluateExtraParams` in class `UIBean`

### getTokenNameField

    public String getTokenNameField()

  Deprecated. Templates should use $parameters from now on, not $tag.

  This will be removed in a future version of Struts.

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