entriesfindbyprimarykeyaction.java

JAVA 经典案例 源代码 Part2.

package org.helpsoft.blog.struts.actions;

import org.apache.struts.*;
import org.apache.struts.action.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.text.*;
import java.math.*;
import org.helpsoft.blog.dao.*;
import org.helpsoft.blog.dto.*;
import org.helpsoft.blog.factory.*;
import org.helpsoft.blog.struts.forms.*;

public class EntriesFindByPrimaryKeyAction extends Action
{
	/**
	 * Method 'execute'
	 * 
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @throws Exception
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception
	{
		try {
			// parse parameters
			int _entryid = Integer.parseInt( request.getParameter("entryid") );
		
			// create the DAO class
			EntriesDao dao = EntriesDaoFactory.create();
		
			// execute the finder
			Entries dto = dao.findByPrimaryKey(_entryid);
		
			// check that we have found a row
			if (dto == null) {
				throw new RuntimeException( "Finder did not return any data" );
			}
		
			// populate a struts form
			EntriesForm entriesForm = new EntriesForm();
			entriesForm.setCrudMethod( request.getParameter("crudMethod") );
			entriesForm.setEntryid(String.valueOf( dto.getEntryid() ));
			entriesForm.setName(dto.getName());
			entriesForm.setAuthor(dto.getAuthor());
			entriesForm.setDate(dto.getDate());
			entriesForm.setContent(dto.getContent());
			// store the results
			request.getSession().setAttribute( "Entries", entriesForm );
		
			return mapping.findForward( request.getParameter("crudMethod") );
		}
		catch (Exception e) {
			e.printStackTrace();
			ActionErrors _errors = new ActionErrors();
			_errors.add( ActionErrors.GLOBAL_ERROR, new ActionError("internal.error", e.getClass().getName() + ": " + e.getMessage() ) );
			saveErrors( request, _errors );
			return mapping.findForward( "failure" );
		}
		
	}

}