struts2中的action獲取web資源

/**
 * 通過和Servlet解耦的方式獲取web資源，例如：ServletContext,Session,request,parameter的Map屬性集合
 * 1、通過ActionContext獲取
 * 2、通過實現xxxAware接口的方式
 */
ActionContext actionContext = ActionContext.getContext();
//獲取application(ServletContext)
Map<String, Object> applicationMap = actionContext.getApplication();
//獲取session
Map<String, Object> sessionMap = actionContext.getSession();
//獲取request
Map<String, Object> requestMap = (Map<String, Object>) actionContext.get("request");
//獲取parameter 返回的是參數數組
Map<String, Object> parameterMap = actionContext.getParameters();

implements RequestAware,ApplicationAware,SessionAware,ParameterAware
private Map<String, Object> sessionMap;
private Map<String, Object> applicationMap;
private Map<String, Object> requestMap;
private Map<String, String[]> parameterMap;
@Override
public void setSession(Map<String, Object> sessionMap) {
this.sessionMap = sessionMap;
}
@Override
public void setApplication(Map<String, Object> applicationMap) {
this.applicationMap = applicationMap;
}
@Override
public void setRequest(Map<String, Object> requestMap) {
this.requestMap = requestMap;
}
@Override
public void setParameters(Map<String, String[]> parameterMap) {
this.parameterMap = parameterMap;
}

/**
 * 通過和Servlet耦合的方式獲取web資源
 * 1、通過ServletActionContext獲取
 * 2、通過實現ServletxxxAware獲取
 */
ServletContext servletContext = ServletActionContext.getServletContext();
HttpServletRequest servletRequest = ServletActionContext.getRequest();
HttpServletResponse httpServletResponse = ServletActionContext.getResponse();

implements ServletContextAware,ServletRequestAware,ServletResponseAware
@Override
public void setServletResponse(HttpServletResponse response) {
}
@Override
public void setServletRequest(HttpServletRequest request) {
}
@Override
public void setServletContext(ServletContext context) {
}