java里面有context吗

java里面有context吗

有

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();

4.在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：

HttpServletRequest request = ServletActionContext.getRequest();
request.getSession();
ServletContext servletContext = ServletActionContext.getServletContext();
HttpServletResponse response = ServletActionContext.getResponse();

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;
}
}

必须得有啊

上下文变量

用servletconfig的getinitparameter方法读取就行了。 getinitparameter("context-param");

如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！

点此我要举报以上问答信息