Struts1_学习笔记1_struts0100_loginAction:单实例（单例），多线程使用时如果有可以修改的成员属性要注意线
Struts1_学习笔记1_struts0100_login
Action:单实例（单例），多线程使用时如果有可以修改的成员属性要注意线程安全
ActionForm一般是粗粒度的，一般一个模块对应一个ActionForm
Action:
public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {LoginActionForm laf = (LoginActionForm)form;String username = laf.getUsername();String password = laf.getPassword();//if ("admin".equals(username) && "admin".equals(password)) {////转向到登录成功页面//request.setAttribute("username", username);//return mapping.findForward("success");//}else {////转向到登录失败页面//return mapping.findForward("error");//}String errorInfo = "";try {UserManager.getInstance().login(username, password);//request.setAttribute("username", username);return mapping.findForward("success");}catch(UserNotFoundException unfe) {unfe.printStackTrace();errorInfo = "用户不能找到，用户名称=[" + username + "]";}catch(PasswordErrorException pee) {pee.printStackTrace();errorInfo = "密码错误";}request.setAttribute("errorinfo", errorInfo);return mapping.findForward("error");}ActionForm 两个属性：username password
注意ActionForm里面的两个方法：
方法/** * 每次收集数据都调用 */@Overridepublic void reset(ActionMapping mapping, HttpServletRequest request) {System.out.println("----------LoginActionForm.reset()-----------");}/** * 每次收集数据都调用 */@Overridepublic ActionErrors validate(ActionMapping mapping,HttpServletRequest request) {System.out.println("----------LoginActionForm.validate()-----------");return null;}配置文件：
<form-beans><form-bean name="loginForm" type="com.aowin.struts.LoginActionForm"/></form-beans><!-- path:访问路径 ,必须以/开头 服务器端很多都必须以/开头，Servlet也是name:用哪个ActionFormscope:默认sessino 不要放到session 因为这个对象用完就没了.默认是session一个Action对应一个ActionMapping实例validate:默认true--><action-mappings><action path="/login"type="com.aowin.struts.LoginAction"name="loginForm"scope="request"validate="true"><forward name="success" path="/login_success.jsp" /><forward name="error" path="/login_error.jsp"/></action></action-mappings>页面可以取ActionForm的value
<body><%LoginActionForm laf = (LoginActionForm)request.getAttribute("loginForm");%><%=laf.getUsername() %>,登录成功</body>假如的struts1的jar：参照发行包里的空项目