在afterRequest()方法中添加判断，如果消息内容不完整则等待一段时间再重新读取。示例如下：

@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
    
    // 在请求前先记录日志
    if (shouldLog(request)) {
        beforeRequest(request);
    }
    
    try {
        filterChain.doFilter(request, response);
    } finally {
        // 在响应后再记录日志
        if (shouldLog(request)) {
            int status = response.getStatus();
            ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper(response);
            afterRequest(request, responseWrapper, status);
            
            responseWrapper.copyBodyToResponse();
        }
    }
}

@Override
protected void afterRequest(HttpServletRequest request, ContentCachingResponseWrapper response, int status) {
    // 获取完整的消息内容
    String requestMessage = getContentAsString(request);
    String responseMessage = getContentAsString(response);
    
    // 如果消息内容不完整则等待一段时间
    if (StringUtils.isEmpty(requestMessage) || StringUtils.isEmpty(responseMessage)) {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        
        requestMessage = getContentAsString(request);
        responseMessage = getContentAsString(response);
    }
    
    // 记录请求日志
    StringBuilder logMessage = new StringBuilder();
    logMessage.append(request.getMethod()).append(" ");
    logMessage.append(request.getRequestURI()).append(" ");
    logMessage.append(status).append("\n");
    logMessage.append("RequestMessage: ").append(requestMessage).append("\n");
    logMessage.append("ResponseMessage: ").append(responseMessage).append("\n");

    logger.info(logMessage.toString());
}

private String getContentAsString(HttpServletRequest request) {
    ContentCachingRequestWrapper wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper.class);
    if (wrapper != null) {
        byte[] content = wrapper.getContentAsByteArray();
        if (content.length > 0) {
            return new String(content, 0, content.length, wrapper.getCharacterEncoding());
        }
    }
    return "";
}

private String getContentAsString(ContentC