HeaderLoggerValve.java 文件源码

@Override
public void invoke(Request request, Response response, ValveContext valveContext) throws IOException, ServletException {
    valveContext.invokeNext(request, response);

    System.out.println("Header Logger Valve:");
    ServletRequest sreq = request.getRequest();
    if(sreq instanceof HttpServletRequest){
        HttpServletRequest hreq = (HttpServletRequest) sreq;
        Enumeration<String> headerNames = hreq.getHeaderNames();
        while (headerNames.hasMoreElements()){
            String headerName = headerNames.nextElement().toString();
            String headerValue = hreq.getHeader(headerName);
            System.out.println(headerName + ": " + headerValue);
        }
    }else {
        System.out.println("Not an HTTP Request");
    }
    System.out.println("-------------------------------------");
}