validateusernameaction.java

一个很不错的网上小型购物系统

package action;

import java.io.PrintWriter;

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 service.AccountService;
import service.ServiceFactory;

public class ValidateUsernameAction extends Action {
	AccountService accountService = ServiceFactory.getAccountService();

	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		String username = request.getParameter("username");
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		if (username == null) {
			out.print("false");
		} else {
			out.print(accountService.validate(username));
		}
		return null;
	}
}