Action中访问requestsession等作用域.ppt

1、,Struts2作用域,章节内容,1、访问或添加几个属性(request/session等),在页面上写入：,$applicationScope.app $sessionScope.ses $requestScope.req,例2：获得Map类型request,session,application,public class LoginAction extends ActionSupport private Map request; private Map session; private Map application; public LoginAction() -构造方法 request

2、= (Map)ActionContext.getContext().get(request); session = ActionContext.getContext().getSession(); application = ActionContext.getContext().getApplication(); public String execute() request.put(r1, r1); session.put(s1, s1); application.put(a1, a1); return SUCCESS; ,2、直接获取作用域的对象,public String rsa() t

3、hrows Exception 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 r

4、esponse = ServletActionContext.getResponse(); return message; ,直接获取作用域对象举例,例3：获得Map类型request,session,application,/这种推荐使用 public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware private Map request; private Map session; private Map application; /DI depen

5、dency injection /IoC inverse of control /控制反转要提供属性的set方法 public String execute() request.put(r1, r1); session.put(s1, s1); application.put(a1, a1); return SUCCESS; Override public void setRequest(Map request) this.request = request; Override public void setSession(Map session) this.session = session

6、; Override public void setApplication(Map application) this.application = application; ,例3,public class LoginAction4 extends ActionSupport implements ServletRequestAware private HttpServletRequest request; private HttpSession session; private ServletContext application; public String execute() reque

7、st.setAttribute(r1, r1); session.setAttribute(s1, s1); application.setAttribute(a1, a1); return SUCCESS; Override public void setServletRequest(HttpServletRequest request) this.request = request; this.session = request.getSession(); this.application = session.getServletContext(); ,例2,public class Lo

8、ginAction extends ActionSupport private HttpServletRequest request; private HttpSession session; private ServletContext application; public LoginAction() request = ServletActionContext.getRequest(); session = request.getSession(); application = session.getServletContext(); public String execute() request.setAttribute(r1, r1); session.setAttribute(s1, s1); application.setAttribute(a1, a1); return SUCCESS; ,3、在页面中使用JSTL标签,public String execute()