org.apache.struts2.components
Class ActionComponent

java.lang.Object
  org.apache.struts2.components.Component
      org.apache.struts2.components.ContextBean
          org.apache.struts2.components.ActionComponent

public class ActionComponent
extends ContextBean

This tag enables developers to call actions directly from a JSP page by specifying the action name and an optional namespace. The body content of the tag is used to render the results from the Action. Any result processor defined for this action in struts.xml will be ignored, unless the executeResult parameter is specified.

• id (String) - the id (if specified) to put the action under stack's context.
• name* (String) - name of the action to be executed (without the extension suffix eg. .action)
• namespace (String) - default to the namespace where this action tag is invoked
• executeResult (Boolean) - default is false. Decides whether the result of this action is to be executed or not
• ignoreContextParams (Boolean) - default to false. Decides whether the request parameters are to be included when the action is invoked

 
 public class ActionTagAction extends ActionSupport {

  public String execute() throws Exception {
      return "done";
  }

  public String doDefault() throws Exception {
      ServletActionContext.getRequest().setAttribute("stringByAction", "This is a String put in by the action's doDefault()");
      return "done";
  }
 }
 
 

 
   
      ....
     
         success.jsp
     
      
         success.jsp
     
      ....
   
 
 

 
  
The following action tag will execute result and include it in this page
  

  
  

  
The following action tag will do the same as above, but invokes method specialMethod in action
  

  
  

  
The following action tag will not execute result, but put a String in request scope
       under an id "stringByAction" which will be retrieved using property tag
  
  
 
 

Field Summary

protected ActionProxyFactory	actionProxyFactory
protected boolean	executeResult
protected boolean	flush
protected boolean	ignoreContextParams
protected String	name
protected String	namespace
protected ActionProxy	proxy
protected javax.servlet.http.HttpServletRequest	req
protected javax.servlet.http.HttpServletResponse	res
protected boolean	rethrowException
protected ValueStackFactory	valueStackFactory

Fields inherited from class org.apache.struts2.components.ContextBean

var

Fields inherited from class org.apache.struts2.components.Component

actionMapper, COMPONENT_STACK, parameters, stack, throwExceptionOnELFailure

Constructor Summary

ActionComponent(ValueStack stack, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)

Method Summary

protected Map	createExtraContext()
protected Map<String,String[]>	createParametersForContext() Creates parameters map using parameters from the value stack and component parameters.
boolean	end(Writer writer, String body) Callback for the end tag of this component.
protected void	executeAction() Execute the requested action.
ActionProxy	getProxy()
void	setActionMapper(ActionMapper mapper)
void	setActionProxyFactory(ActionProxyFactory actionProxyFactory)
void	setExecuteResult(boolean executeResult)
void	setFlush(boolean flush)
void	setIgnoreContextParams(boolean ignoreContextParams)
void	setName(String name)
void	setNamespace(String namespace)
void	setRethrowException(boolean rethrowException)
void	setValueStackFactory(ValueStackFactory valueStackFactory)

Methods inherited from class org.apache.struts2.components.ContextBean

getVar, putInContext, setId, setVar

Methods inherited from class org.apache.struts2.components.Component

addAllParameters, addParameter, altSyntax, altSyntax, completeExpressionIfAltSyntax, copyParams, determineActionURL, determineNamespace, end, fieldError, findAncestor, findString, findString, findStringIfAltSyntax, findValue, findValue, findValue, getComponentStack, getParameters, getStack, popComponentStack, setThrowExceptionsOnELFailure, setUrlHelper, start, stripExpressionIfAltSyntax, stripExpressionIfAltSyntax, toString, usesBody

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

res

protected javax.servlet.http.HttpServletResponse res

req

protected javax.servlet.http.HttpServletRequest req

valueStackFactory

protected ValueStackFactory valueStackFactory

actionProxyFactory

protected ActionProxyFactory actionProxyFactory

proxy

protected ActionProxy proxy

name

protected String name

namespace

protected String namespace

executeResult

protected boolean executeResult

ignoreContextParams

protected boolean ignoreContextParams

flush

protected boolean flush

rethrowException

protected boolean rethrowException

Constructor Detail

ActionComponent

public ActionComponent(ValueStack stack,
                       javax.servlet.http.HttpServletRequest req,
                       javax.servlet.http.HttpServletResponse res)

Method Detail

setActionProxyFactory

public void setActionProxyFactory(ActionProxyFactory actionProxyFactory)

Parameters:

actionProxyFactory - the actionProxyFactory to set

setValueStackFactory

public void setValueStackFactory(ValueStackFactory valueStackFactory)

setActionMapper

public void setActionMapper(ActionMapper mapper)

Overrides:

setActionMapper in class Component

end

public boolean end(Writer writer,
                   String body)

Description copied from class: Component

Callback for the end tag of this component. Should the body be evaluated again?

NOTE: will pop component stack.

Overrides:

end in class Component

Parameters:

writer - the output writer.

body - the rendered body.

Returns:

true if the body should be evaluated again

createExtraContext

protected Map createExtraContext()

createParametersForContext

protected Map<String,String[]> createParametersForContext()

Creates parameters map using parameters from the value stack and component parameters. Any non-String array values will be converted into a single-value String array.

Returns:

A map of String[] parameters

getProxy

public ActionProxy getProxy()

executeAction

protected void executeAction()

Execute the requested action. If no namespace is provided, we'll attempt to derive a namespace using buildNamespace(). The ActionProxy and the namespace will be saved into the instance variables proxy and namespace respectively.

See Also:

TagUtils.buildNamespace(org.apache.struts2.dispatcher.mapper.ActionMapper, com.opensymphony.xwork2.util.ValueStack, javax.servlet.http.HttpServletRequest)

setName

public void setName(String name)

setNamespace

public void setNamespace(String namespace)

setExecuteResult

public void setExecuteResult(boolean executeResult)

setIgnoreContextParams

public void setIgnoreContextParams(boolean ignoreContextParams)

setFlush

public void setFlush(boolean flush)

setRethrowException

public void setRethrowException(boolean rethrowException)