validateuseraction.java

实现网上订餐系统

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.eatery.user.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.eatery.service.UserInfoService;


public class ValidateUserAction extends Action {
	private UserInfoService service;
	public UserInfoService getService() {
		return service;
	}
	public void setService(UserInfoService service) {
		this.service = service;
	}
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws IOException {
		String userName=request.getParameter("userName");
		
		List list=service.findUserInfoByUserName(userName);
		
		response.setContentType("text/html; charset=UTF-8");
		
		PrintWriter out = response.getWriter();
		
		/*
		 * 判断如果数据库中存在这个用户名则list.size()返回大于0；
		 * 表明此用户已存在
		 * */
		
		if (list.size()!=0) {
			out.print("<span style='color: red;font-weight: bold;'>Sorry！用户名已存在！！！</span>");
		} else {
			out.print("<span style='color: green;font-weight: bold;'>恭喜！此用户名可以使用！！！</span>");
		}
		out.close();
		
		return null;
	}
}