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過濾器Filter中得到各種路徑

init()方法中:

  filterConfig.getServletContext():
  filterConfig.getServletContext().getRealPath("/"):
  filterConfig.getServletContext().getRealPath("/admin"):

doFilter()方法中:

  HttpServletRequest request = (HttpServletRequest) servletRequest;
  HttpServletResponse response = (HttpServletResponse) servletResponse;

之後:

request.getContextPath():