loginaction.java

简单的web应用,实现基本的购物车功能,有良好的扩展性

package struts.action;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import struts.actionform.LoginForm;
import bo.LoginBo;

public class LoginAction extends Action {

    public ActionForward execute(ActionMapping actionMapping,
                                 ActionForm actionForm,
                                 HttpServletRequest servletRequest,
                                 HttpServletResponse response) {
        LoginForm form = (LoginForm) actionForm;

        return this.getActionForward(actionMapping, form, servletRequest);
    }

    /**
     * 页面转向
     * @param mapping
     * @param theForm
     * @return 将要转向的页面
     */
    private ActionForward getActionForward(ActionMapping mapping,
                                           LoginForm form,
                                           HttpServletRequest request) {
        String event = form.getEvent();
        LoginBo bo = LoginBo.getInstance();
        if ("login".equals(event)) {
            form.setMsg(bo.verifyUser(form));
            if ("".equals(form.getMsg())) { //登陆成功
                request.getSession().setAttribute("username", form.getUsername());
                if ("admin".equals(form.getUsername())) {
                    return mapping.findForward("admin"); //管理员界面
                } else {
                    return mapping.findForward("customer"); //用户界面
                }
            } else {
                //登陆失败，回到登陆页面
                return mapping.findForward("login");
            }
        } else if ("add".equals(event)) { //添加新的用户
            return mapping.findForward("add");
        } else if ("save".equals(event)) {
            if (bo.isExist(form)) {
                form.setMsg("用户名已存在");
                return mapping.findForward("add");
            } else {
                bo.addUser(form);
                form.setMsg("帐户创建成功，请登陆！");
                return mapping.findForward("login");
            }
        } else { //进入登陆页面
            return mapping.findForward("login");
        }

    }

}