adddvdaction.java

用Struts实现的一个例子

//Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_4.1.1/xslt/JavaClass.xsl

package com.yourcompany.struts.action;
 
import java.util.LinkedList;
import java.util.List;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.yourcompany.struts.form.AddDVDForm;

import dvd.model.DVDLibrary;

/** 
 * MyEclipse Struts
 * Creation date: 10-29-2006
 * 
 * XDoclet definition:
 * @struts.action path="/addDVD" name="addDVDForm" input="/addDVD.jsp" scope="request" validate="true"
 * @struts.action-forward name="success" path="/success.jsp"
 * @struts.action-forward name="failure" path="/addDVD.jsp"
 */
public class AddDVDAction extends Action {

	// --------------------------------------------------------- Instance Variables

	// --------------------------------------------------------- Methods

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	@SuppressWarnings("unchecked")
	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response) {
		AddDVDForm addDVDForm = (AddDVDForm) form;

		// 用于存放错误信息
		List errorMsgs = new LinkedList();

		try
		{	
			int year = -1;
			try
			{
				year = Integer.parseInt(addDVDForm.getYear());
			}catch(NumberFormatException nfe)
			{
				errorMsgs.add("The 'year' field must be apositive integer.");
			}
			
			if((year != -1) && ((year < 2000 ) || (year > 2010)) )
			{
				errorMsgs.add("The 'year' field must within 2000 to 2010");
			}
			if( addDVDForm.getGenre().length() == 0)
			{
				errorMsgs.add("please input newgenre or genre");
			}
			if( addDVDForm.getTitle().length() == 0)
			{
				errorMsgs.add("Please enter the title of the league.");
			}
			
			if( !errorMsgs.isEmpty())
			{
				request.setAttribute("error",errorMsgs);
				return mapping.findForward("failure");
			}
			// 创建对象
			DVDLibrary libaray = new DVDLibrary();
			
			libaray.createDVDItem(addDVDForm.getTitle(),
					addDVDForm.getYear(),
					addDVDForm.getGenre());
			
			//addDVDForm.setGenre("中国人");
			
			request.setAttribute("title",addDVDForm.getTitle());
			request.setAttribute("year",addDVDForm.getYear());
			request.setAttribute("genre",addDVDForm.getGenre());
			return mapping.findForward("success");
		}catch(RuntimeException e)
		{
			e.printStackTrace();
			return mapping.findForward("failure");
		}
	}// end of meth

}