Home Article Practice ServletContext

ServletContext

2020-11-17 19:08  views:383  source:在线打字小编    

ServletContext对象: 1.概念:代表了整个web应用,可以和程序的容器(服务器)通信
。 2.获取: 1.通过request对象获取
request.getServletContext();
2.通过HttpServlet获取 this.getServ
letContext(); 3.功能: 1.获取MIME类型;
*MIME类型:在互联网通信过程中定义了一种文件数据类型。
*格式: 大类型/小类型 text/html image/jpeg *获
取:String getMimeType(String file) 2.域对象:
共享数据 1.setAttribute(String name,Obj
ect value) 2.getAttribute(String nam
e) 3.removeAttribute(String name)
*ServletContext对象范围:所用用户所有请求的数据
3.获取文件的真实(服务器)路径



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