3.Struts的<action input=""></action>:Action

package com.bjpowernode.struts;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;/** * 登录Action * 负责取得表单数据、调用业务逻辑、返回转向信息 *  * @author Administrator * */public class LoginAction extends Action {@Overridepublic ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {LoginActionForm laf = (LoginActionForm)form;String username = laf.getUsername();String password = laf.getPassword();UserManager userManager = new UserManager();try {userManager.login(username, password);request.getSession().setAttribute("username", username);return mapping.findForward("success");}catch(UserNotFoundException e) {e.printStackTrace();request.setAttribute("msg", "用户不能找到，用户名称=【" + username + "】");}catch(PasswordErrorException e) {e.printStackTrace();request.setAttribute("msg", "密码错误");}return mapping.getInputForward();}}