inittxaction.java

STRUTS数据库项目开发宝典

package org.helpsoft.actions;

import javax.servlet.*;
import javax.servlet.http.*;
import java.text.SimpleDateFormat;
import org.helpsoft.servicelocator.*;
import org.helpsoft.session.AssociatorManageService;
import org.apache.struts.action.*;

import com.helpsoft.util.log.*;
import com.helpsoft.util.*;
import com.helpsoft.util.genelv.struts.GenericAction;
import org.helpsoft.session.*;
import org.helpsoft.entity.tx.*;
import com.helpsoft.Constants;
import org.helpsoft.forms.*;


/**
 * Struts 'Init' Action; prepares any information needed prior to displaying the 'txForm'.
 *
 * @author  cao guangxin - www.relationinfo.com
 * @struts.action path="/initTx"
 *                type="org.helpsoft.actions.InitTxAction"
 *                name="txForm"
 *                scope="request"
 *                validate="false"
 * @struts.action-forward name="success" path="/tx.jsp"
 */
public class InitTxAction extends ServiceAction {
   private Logger log = LogService.getLogger(this.getClass());

   /**
    * Performs an action.
    *
    * @param mapping The ActionMapping used to select this instance
    * @param actionForm The optional ActionForm bean for this request (if any)
    * @param request The optional ActionForm bean for this request (if any)
    * @param response The HTTP response we are creating
    * @return describes where and how control should be forwarded, or <code>null</code> if the response has already
    *         been completed
    * @throws Exception in case of an error
    */
   public ActionForward doPerform(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request,
                                  HttpServletResponse response) throws Exception {
      log.info("start doPerform");
      TxForm form = (TxForm) actionForm;
      HttpSession session  = request.getSession();
      String txbh = request.getParameter("txbh");

      if (txbh != null && txbh.equalsIgnoreCase("null")) {
         txbh = null;
      }

      if (form == null) {
         form = new TxForm();

         if ("request".equals(mapping.getScope())) {
            request.setAttribute(mapping.getAttribute(), form);
         }
         else {
            session.setAttribute(mapping.getAttribute(), form);
         }
      }

      if (txbh != null &&  true) { // hack to allow automatic generation of sources with JAG
         try {
            form.setMode("change");
            TxIf txData = getAssociatorManageService().getTx(new java.lang.String(txbh));
            PropertyUtilsExt.copyProperties(form, txData);

         }
         catch (Throwable t) {
            servlet.log("InitTxAction :", t);
            throw new ServletException("InitTxAction :", t);
         }
      }
      else {
         form.setMode("new");
         PropertyUtilsExt.copyProperties(form, new TxData());
      }
      return mapping.findForward("success");
   }
}