validateusernameaction.java

spring struts hibernate 集成开发的web应用

//Create and modify by cnsdl
package com.sc.struts.action.user.manage;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
//import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import com.sc.struts.form.user.reg.CheckUsernameForm;


import com.sc.dao.UserDAO;

/** 
 * @author cnsdl
 * Creation date: 02-17-2006
 * 
 * XDoclet definition:
 * @struts.action path="/validateUsername" name="checkUsernameForm" scope="request" validate="true"
 */
public class ValidateUsernameAction extends Action {

	// --------------------------------------------------------- Instance Variables
	private static final String Exist = "Exist";

	private static final String Nonexist = "Nonexist";

	private UserDAO userDAO;

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

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	
	public ActionForward execute(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response) {
		
		//ActionErrors errors = new ActionErrors();
		
		ActionMessages msg = new ActionMessages();
		CheckUsernameForm checkUsernameForm = (CheckUsernameForm) form;

		if (userDAO.isUsedUsername(checkUsernameForm.getUsername())){
			//进入更改密码的第二步
			return mapping.findForward(Exist);
		}else{
			//处理错误
			msg.add(msg.GLOBAL_MESSAGE, new ActionMessage("no.db.username"));
			//errors.add("Nonexist", new ActionMessage("no.db.username"));
			saveMessages(request,msg);
			//saveErrors(request,errors);
			return mapping.findForward(Nonexist);
		}
	}

	public UserDAO getUserDAO() {
		return userDAO;
	}

	public void setUserDAO(UserDAO userDAO) {
		this.userDAO = userDAO;
	}

}