在java中获取ServletContext的常见方法

2019-11-06 08:58:29

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1.在javax.servlet.Filter中直接获取 ServletContext context = config.getServletContext(); 2.在HttpServlet中直接获取this.getServletContext() 3.在其他方法中，通过HttPRequest获得 request.getsession().getServletContext(); 当然struts2中还有常见的两种方法获得获取HttpServletRequest / HttpSession / ServletContext / HttpServletResponse对象方法一，通过ServletActionContext.类直接获取： public String rsa() throws Exception{ HttpServletRequest request = ServletActionContext.getRequest(); ServletContext servletContext = ServletActionContext.getServletContext(); request.getSession() HttpServletResponse response = ServletActionContext.getResponse(); return "scope"; } 方法二，实现指定接口，由struts框架运行时注入： 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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