1.在javax.servlet.Filter中直接獲取 ServletContext context = config.getServletContext(); 2.在HttpServlet中直接獲取 this.getServletContext() 3.在其他方法中，通過HttpRequest獲得 request.getSession().getServletContext(); 當然struts2中還有常見的兩種方法獲得 獲取HttpServletRequest / HttpSession / ServletContext / HttpServletResponse對象 方法一，通過ServletActionContext.類直接獲取： public String rsa() throws Exception{ HttpServletRequest request = ServletActionContext.getRequest(); ServletContext servletContext = ServletActionContext.getServletContext(); request.getSession() HttpServletResponse response = ServletActionContext.getResponse(); return "scope"; } 方法二，實現指定接口，由struts框架運行時注入： public class HelloWorldAction implements ServletRequestAware, ServletResponseAware, ServletContextAware{ private HttpServletRequest request; private ServletContext servletContext; private HttpServletResponse response; public void setServletRequest(HttpServletRequest req) { this.request=req; } public void setServletResponse(HttpServletResponse res) { this.response=res; } public void setServletContext(ServletContext ser) { this.servletContext=ser; } }

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