javaweb 各种路径获取

javaWeb 下的各种路径获取方法

          protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        response.setContentType("text/html;charset=utf-8");

        //1. 获取当前appWeb的根目录的绝对路径
        String path = getServletContext().getRealPath("");
        out.println(path+"
");

        //也能获取到当前appWeb的根目录的绝对路径
        path = request.getRequestURI();
        out.println(path+"
");

        //2. 获取当前appWeb的根目录的相对路径， 以tomcat的应用根目录为参考点，一般情况下，在JSP/HTML页面等引用的CSS,Javascript.Action等属性前面最好都加上<%=request.getContextPath()%>,以确保所引用的文件都属于Web应用中的目录
        path = request.getContextPath();
        out.println(path+"
");


        //3. 获取WEB-INF下的classes目录路径
        path = this.getClass().getClassLoader().getResource("").getPath();
        out.println(path+"
");

        //4. 获取WEB-INF下的classes目录路径的上级目录。
        path = new File(this.getClass().getClassLoader().getResource("").getPath()).getParent();
        out.println(path+"
");

        //5. 获取tomcat服务器web应用的临时工作目录
        File file = (File)getServletContext().getAttribute("javax.servlet.context.tempdir");
        path = file.getAbsolutePath();
        out.println(path+"
");
    }