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Servlet--ServletContext
阅读量:291 次
发布时间:2019-03-01

本文共 1112 字,大约阅读时间需要 3 分钟。

ServletContext对象:    1,概念:代表整个web应用,可以和程序的容器(服务器)来通信    2,获取        1,通过request对象获取            request.getServletContext();        2,通过HttpServlet获取            this.getServletContext();    3,功能:        1,获取MIME类型:            MIME类型:在互联网通信过程中定义的一种文件数据类型                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,Object value)            2,getAttribute(String name)            3,removeAttribute(String name)            ServletContext对象范围:所有用户所有请求得数据        3,获取文件的真实(服务器)路径            方法:String getRealPath(String path)                例:                      ServletContext context = this.getServletContext();                      String a=context.getRealPath("/a.txt");//web目录下资源路径                      System.out.println(a);                                      String b=context.getRealPath("/WEB-INF/b.txt");//WEB-INF目录下资源路径d                      System.out.println(b);                                      String c=context.getRealPath("WEB-INF/classes/c.txt");//src目录下的资源访问                      System.out.println(c);

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