Layers of Progressive Struts1 (vii) detailed dispatchaction

Through the previous several blogs, do not know whether we have found this problem, although now can be flexible control jump, but the number of action is still more, how to ensure that the jump flexibility, but also reduce the number of action? This is what our blog says about Dispatchaction, which, like its name, can be understood as a "distribution action," which avoids creating a class for each action.

Let's take a look at the examples first.

Useraction

Dispatchaction inherits the action, which is characterized by merging the previous action into one, which, when multiple action associations are large, can be put together like this, reducing the action class and reducing the difficulty of maintenance.

Package com.tgb.drp.web.actions;  
Import Java.util.Date;  
      
Import java.util.List;  
Import Javax.servlet.http.HttpServletRequest;  
      
Import Javax.servlet.http.HttpServletResponse;  
Import Org.apache.commons.beanutils.BeanUtils;  
Import Org.apache.struts.action.ActionForm;  
Import Org.apache.struts.action.ActionForward;  
Import org.apache.struts.action.ActionMapping;  
      
Import org.apache.struts.actions.DispatchAction;  
Import Com.tgb.drp.manager.UserManager;  
Import Com.tgb.drp.model.User;  
      
Import Com.tgb.drp.web.forms.UserActionForm; public class Useraction extends Dispatchaction {@Override protected actionforward unspecified (Actionmapp  ing mapping, actionform form, httpservletrequest request, httpservletresponse response) throws  
        Exception {//Call business logic operations List userlist = Usermanager.getinstance (). Findalluserlist ();  
           Request.setattribute ("UserList", userlist);   
        Return Mapping.findforward ("list_success"); 
     /** * User deleted * @param mapping * @param form * @param request * @param response  
            * @return * @throws Exception/public Actionforward del (actionmapping Mapping, Actionform form, HttpServletRequest request, HttpServletResponse response) throws Exception {//Get from page form  
              
        The value submitted over the Useractionform UAF = (useractionform) Form;  
      
        Obtain the set of UserID that need to be removed string[] useridlist = Uaf.getselectflag ();  
        Invoke Business logic Operations Usermanager.getinstance (). Deleteusers (Useridlist);  
    Return Mapping.findforward ("del_success"); /** * User Add * @param mapping * @param form * @param request * @param RESPO NSE * @return * @throws Exception/Public actionforward Add (actionmapping mapping, actionform form , HttpseRvletrequest request, HttpServletResponse response) throws Exception {//Get submitted from page form  
        Come over the value useractionform UAF = (useractionform) Form;  
        User user = new user ();  
        Beanutils.copyproperties (user, UAF);  
              
        User.setcreatedate (New Date ());  
        Invoke Business logic Operations Usermanager.getinstance (). AddUser (user);  Return Mapping.findforward ("add_success"); 
     /** * Modify User * @param mapping * @param form * @param request * @param response   
            * @return * @throws Exception/Public Actionforward Modify (actionmapping mapping, Actionform form, HttpServletRequest request, HttpServletResponse response) throws Exception {//Get from page  
        The value submitted in the surface form useractionform UAF = (useractionform) Form;  
        User user = new user ();  
              
        Beanutils.copyproperties (user, UAF);  
       Calling business logic operations Usermanager.getinstance (). ModifyUser (user);  
    Return Mapping.findforward ("modify_success");  /** * Query users by ID * * @param mapping * @param form * @param request * @param response * @return * @throws Exception/public Actionforward find (actionmapping mapping, A  
        Ctionform form, httpservletrequest request, httpservletresponse response) throws Exception {  
              
        Gets the value submitted from the page form useractionform UAF = (useractionform) Form;  
              
        String userId = Uaf.getuserid ();  
              
        Invoke Business logic Action User user = Usermanager.getinstance (). Finduserbyid (UserId);  
              
        Pass the user object from the action to the JSP page Request.setattribute ("user", user);  
    Return Mapping.findforward ("find_success"); }  
          
}