struts2中几种获得request，session等对象的方法

1、通过ActionContext来获得举例代码如下：

情况1：

ActionContext context = ActionContext.getContext();

Map request = (Map) context.get("request");

Map session = context.getSession();

Map application = context.getApplication();

情况2：

ActionContext actionContext = ActionContext.getContext();

HttpServletRequest request = (HttpServletRequest) actionContext

.get(ServletActionContext.HTTP_REQUEST);

HttpSession session = request.getSession();

ServletContext context = (ServletContext) actionContext

.get(ServletActionContext.SERVLET_CONTEXT);

2、通过实现 RequestAware, SessionAware,ApplicationAware等接口来获得，举例代码如下：

public class LoginAction2 implements Action, RequestAware, SessionAware,

ApplicationAware {

private Map request;

private Map session;

private Map application;

public void setRequest(Map request) {

this.request = request;

}

public void setSession(Map session) {

this.session = session;

}

public void setApplication(Map application) {

this.application = application;

}

｝

3、通过ServletActionContext来获得，举例代码如下：

// 利用ServletActionContext获得request

HttpServletRequest request = ServletActionContext.getRequest();

// 利用request获得session

HttpSession session = request.getSession();

// 利用ServletActionContext获得servletContext

ServletContext context = ServletActionContext.getServletContext();