checkaction.java

用ExtJS做的一个网页聊天工具

package com.shyhao.qq.action;

import java.io.IOException;
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.shyhao.qq.service.LoginService;

public class CheckAction extends Action {


	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		String userName=request.getParameter("userName");
		LoginService lse=new LoginService();
		boolean exist=lse.checkUser(userName);
		response.setCharacterEncoding("UTF-8");
		try {
			if(exist){
				response.getWriter().write("false");
			}else{
				response.getWriter().write("true");
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
}