java - 记录 Spring REST API

Question

我有自定义过滤器，我想记录请求的正文。 但是，当我使用 ContentCachingRequestWrapper 并尝试调用 getContentAsByteArray() 时，我总是得到一个空数组。

@Component
public class CustomFilter implements Filter {

    private final Logger log = LoggerFactory.getLogger(CustomFilter.class);

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpServletRequest requestToCache = new ContentCachingRequestWrapper(request);

        chain.doFilter(req, res);

       log.info(getRequestData(requestToCache));
    }

    @Override
    public void init(FilterConfig filterConfig) {
    }

    @Override
    public void destroy() {
    }

    public static String getRequestData(final HttpServletRequest request) throws UnsupportedEncodingException {
        String payload = null;
        ContentCachingRequestWrapper wrapper = WebUtils.getNativeRequest(request, ContentCachingRequestWrapper.class);
        if (wrapper != null) {
            byte[] buf = wrapper.getContentAsByteArray();
            if (buf.length > 0) {
                payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
            }
        }
        return payload;
    }
  }

我也尝试创建Interceptor，但遇到了同样的问题。 我究竟做错了什么？ 感谢您的帮助。

Answer 1

您只需在 @Configuration 注解的类中注册此 bean 即可使用现有的 spring 实现:

@Bean
public static Filter requestLoggingFilter() {
    final CommonsRequestLoggingFilter loggingFilter = new CommonsRequestLoggingFilter();
    loggingFilter.setIncludePayload(true);
    loggingFilter.setMaxPayloadLength(512);

    return loggingFilter;
}