官方Class LookupDispatchAction說明文檔（轉）

原創 iteye_7700 2020-07-03 03:55
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org.apache.struts.actions
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Class LookupDispatchAction


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java.lang.Object extended byorg.apache.struts.action.Actionextended byorg.apache.struts.actions.DispatchActionextended byorg.apache.struts.actions.LookupDispatchAction


public abstract class LookupDispatchAction



extends DispatchAction




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An abstract Action that dispatches to the subclass mapped execute method. This is useful in cases where an HTML form has multiple submit buttons with the same name. The button name is specified by the parameter property of the corresponding ActionMapping. To configure the use of this action in your struts-config.xml file, create an entry like this:



   <action path="/test"
      type="org.example.MyAction" 
      name="MyForm" 
      scope="request"
      input="/test.jsp"
      parameter="method"/> 


which will use the value of the request parameter named "method" to locate the corresponding key in ApplicationResources. For example, you might have the following ApplicationResources.properties:


    button.add=Add Record    button.delete=Delete Record  


And your JSP would have the following format for submit buttons:


   <html:form action="/test">
   <html:submit property="method">
      <bean:message key="button.add"/>  
  </html:submit>    
<html:submit property="method">      
   <bean:message key="button.delete"/>    
</html:submit>  </html:form>  


Your subclass must implement both getKeyMethodMap and the methods defined in the map. An example of such implementations are:


  protected Map getKeyMethodMap() {
      Map map = new HashMap();
      map.put("button.add", "add");
      map.put("button.delete", "delete");
      return map;
  }
  public ActionForward add(ActionMapping mapping,
          ActionForm form,          HttpServletRequest request,
          HttpServletResponse response) throws IOException, ServletException {
      // do add
      return mapping.findForward("success");
  }
  public ActionForward delete(ActionMapping mapping,
          ActionForm form,          HttpServletRequest request,
          HttpServletResponse response) throws IOException, ServletException {
      // do delete
      return mapping.findForward("success");
  }  
Notes - If duplicate values exist for the keys returned by getKeys, 
only the first one found will be returned. If no corresponding key is found 
then an exception will be thrown. You can override the method unspecified to
 provide a custom handler. If the submit was cancelled (a html:cancel button
 was pressed), the custom handler cancelled will be used instead.
<!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- -->


Field Summary
protected  java.util.Map

keyMethodMap
          Resource key to method name lookup.		

protected  java.util.Map

localeMap
          Reverse lookup map from resource value to resource key.		

 <!-- -->
Fields inherited from class org.apache.struts.actions.DispatchAction
clazz, log, messages, methods, types
 <!-- -->
Fields inherited from class org.apache.struts.action.Action
defaultLocale, servlet
 <!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- -->
Constructor Summary

LookupDispatchAction()
           
 <!-- ========== METHOD SUMMARY =========== --><!-- -->
Method Summary
 ActionForward

execute(ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
          Process the specified HTTP request, and create the corresponding HTTP response (or forward to another web component that will create it).		

protected abstract  java.util.Map

getKeyMethodMap()
          Provides the mapping from resource key to method name.		

protected  java.lang.String

getLookupMapName(javax.servlet.http.HttpServletRequest request, java.lang.String keyName, ActionMapping mapping)
          Lookup the method name corresponding to the client request's locale.		

protected  java.lang.String

getMethodName(ActionMapping mapping, ActionForm form, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, java.lang.String parameter)
          Returns the method name, given a parameter's value.		

private  java.util.Map

initLookupMap(javax.servlet.http.HttpServletRequest request, java.util.Locale userLocale)
          This is the first time this Locale is used so build the reverse lookup Map.		

 <!-- -->
Methods inherited from class org.apache.struts.actions.DispatchAction
cancelled, dispatchMethod, getMethod, unspecified
 <!-- -->
Methods inherited from class org.apache.struts.action.Action
addErrors, addMessages, execute, generateToken, getDataSource, getDataSource, getErrors, getLocale, getMessages, getResources, getResources, getServlet, isCancelled, isTokenValid, isTokenValid, resetToken, saveErrors, saveErrors, saveMessages, saveMessages, saveToken, setLocale, setServlet
 <!-- -->
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
<!-- ============ FIELD DETAIL =========== --><!-- -->


Field Detail
<!-- -->
localeMap


protected java.util.Map localeMap


Reverse lookup map from resource value to resource key.


<!-- -->
keyMethodMap


protected java.util.Map keyMethodMap


Resource key to method name lookup.


<!-- ========= CONSTRUCTOR DETAIL ======== --><!-- -->
Constructor Detail
<!-- -->
LookupDispatchAction


public LookupDispatchAction()

<!-- ============ METHOD DETAIL ========== --><!-- -->
Method Detail
<!-- -->
execute


public execute( mapping,
 form, 
                            javax.servlet.http.HttpServletRequest request,
                             javax.servlet.http.HttpServletResponse response)
                      throws java.lang.Exception


Process the specified HTTP request, and create the corresponding HTTP 
response (or forward to another web component that will create it). 
Return an ActionForward instance describing where and how control should 
be forwarded, or null if the response has already been completed.




Overrides:



execute in class DispatchAction





Parameters:



mapping - The ActionMapping used to select this instance



request - The HTTP request we are processing



response - The HTTP response we are creating



form - The optional ActionForm bean for this request (if any)


Returns:


Describes where and how control should be forwarded.


Throws:



java.lang.Exception - if an error occurs




<!-- -->
initLookupMap


private java.util.Map initLookupMap(
                                 javax.servlet.http.HttpServletRequest request,
                                    java.util.Locale userLocale)


This is the first time this Locale is used so build the reverse lookup Map.
 Search for message keys in all configured MessageResources for the current 
module.






<!-- -->
getKeyMethodMap


protected abstract java.util.Map getKeyMethodMap()


Provides the mapping from resource key to method name.




Returns:


Resource key / method name map.




<!-- -->
getLookupMapName


protected java.lang.String getLookupMapName(
                        javax.servlet.http.HttpServletRequest request,
                                            java.lang.String keyName,
 mapping)
                                     throws javax.servlet.ServletException


Lookup the method name corresponding to the client request's locale.




Parameters:



request - The HTTP request we are processing



keyName - The parameter name to use as the properties key



mapping - The ActionMapping used to select this instance


Returns:


The method's localized name.


Throws:



javax.servlet.ServletException - if keyName cannot be resolved


Since:


Struts 1.2.0




<!-- -->
getMethodName


protected java.lang.String getMethodName( mapping,
 form,
                                    javax.servlet.http.HttpServletRequest request,
                                    javax.servlet.http.HttpServletResponse response,
                                     java.lang.String parameter)
                                  throws java.lang.Exception


Returns the method name, given a parameter's value.




Overrides:



getMethodName in class DispatchAction





Parameters:



mapping - The ActionMapping used to select this instance



form - The optional ActionForm bean for this request (if any)



request - The HTTP request we are processing



response - The HTTP response we are creating



parameter - The ActionMapping parameter's name


Returns:


The method's name.


Throws:


java.lang.Exception


Since:


Struts 1.2.0




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