checkaction.java

ajax的简单demo适合初学者练习用。

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.ajax.struts.action;

import java.io.IOException;
import java.io.PrintWriter;
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.ajax.dao.TblUserDAO;

/** 
 * MyEclipse Struts
 * Creation date: 11-16-2008
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 */
public class CheckAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		// TODO Auto-generated method stub
		String uname = request.getParameter("uname");
		System.out.println(uname);
		TblUserDAO dao = new TblUserDAO();
		List list = dao.findByUname(uname);
		try {
			PrintWriter out = response.getWriter();
			if(list.size()==0){
				out.print(true);
			}else{
				out.print(false);
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return null;
	}
}