@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
boolean clear = false;
if (!ThreadContext.containsKey("id")) {
clear = true;
ThreadContext.put("id", UUID.randomUUID().toString());
HttpSession session = ((HttpServletRequest) request).getSession(false);
if (session != null) {
ThreadContext.put("username", (String) session.getAttribute("username"));
}
}
try {
chain.doFilter(request, response);
} finally {
if (clear) {
ThreadContext.clearAll();
}
}
}
