方法一：

  StringBuffer sb=new StringBuffer();
  sb.append(File.separator+"images"+File.separator+"vacationImage");
  String path=ServletActionContext.getServletContext().getRealPath(sb.toString());

方法二：

通過RequestUtils獲取專案的上下文的資訊：

String path=RequestUtils.getServletPath(ServletActionContext.getRequest());

原始碼如下：

public class RequestUtils {

    /**
     * Retrieves the current request servlet path.
     * Deals with differences between servlet specs (2.2 vs 2.3+)
     *
     * @param request the request
     * @return the servlet path
     */
    public static String getServletPath(HttpServletRequest request) {
        String servletPath = request.getServletPath();
       
        String requestUri = request.getRequestURI();
        // Detecting other characters that the servlet container cut off (like anything after ';')
        if (requestUri != null && servletPath != null && !requestUri.endsWith(servletPath)) {
            int pos = requestUri.indexOf(servletPath);
            if (pos > -1) {
                servletPath = requestUri.substring(requestUri.indexOf(servletPath));
            }
        }
       
        if (null != servletPath && !"".equals(servletPath)) {
            return servletPath;
        }
       
        int startIndex = request.getContextPath().equals("") ? 0 : request.getContextPath().length();
        int endIndex = request.getPathInfo() == null ? requestUri.length() : requestUri.lastIndexOf(request.getPathInfo());

        if (startIndex > endIndex) { // this should not happen
            endIndex = startIndex;
        }

        return requestUri.substring(startIndex, endIndex);
    }

}