src/com/jiudai/action/LoginAction.java

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package com.jiudai.action;

import com.jiudai.dao.UserDAO;
import com.jiudai.domain.User;
import com.opensymphony.xwork2.ActionContext;

public class LoginAction {
	User user;

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}
	
	public String CheckLogin() { 
		UserDAO userDAO = new UserDAO();
		ActionContext ctx = ActionContext.getContext();
		if(!userDAO.CheckLogin(user)) {
			ctx.put("error", userDAO.getErrMessage());
			return "error";
		} 
		
		/*
		ActionContext ctx = ActionContext.getContext();
		ctx.getApplication().put("app", "应用范围");//往ServletContext里放入app
		ctx.getSession().put("ses", "session范围");//往session里放入ses
		ctx.put("req", "request范围");//往request里放入req
		ctx.put("names", Arrays.asList("老张", "老黎", "老方")); 
		HttpServletRequest request = ServletActionContext.getRequest();
		ServletContext servletContext = ServletActionContext.getServletContext();
		request.setAttribute("req", "请求范围属性");
		request.getSession().setAttribute("ses", "会话范围属性");
		servletContext.setAttribute("app", "应用范围属性");
		//HttpServletResponse response = ServletActionContext.getResponse();
		 */
		
		ctx.getSession().put("username", user.getUsername());
		return "main"; 
	}
	
	
	
}