PageContextImpl.java 文件源码

private final String getAbsolutePathRelativeToContext(String relativeUrlPath) {
    String path = relativeUrlPath;

    if (!path.startsWith("/")) {
        String uri = (String) request.getAttribute(
                RequestDispatcher.INCLUDE_SERVLET_PATH);
        if (uri == null)
            uri = ((HttpServletRequest) request).getServletPath();
        String baseURI = uri.substring(0, uri.lastIndexOf('/'));
        path = baseURI + '/' + path;
    }

    return path;
}