仅记录http servlet响应标头 [英] Log only http servlet response headers

问题描述

这是与捕获并记录响应正文相关的问题。如果我只想记录响应头而不是整个身体怎么办？是否有与链接问题中描述的方法不同的方法？

This is a question related to Capture and log the response body. What if I only want to log the response headers, and not the entire body? Is there a different approach than described in the linked question?

推荐答案

您想要覆盖 HttpServletResponse＃addHeader（） 和 HttpServletResponse＃setHeader（） 方法相反。

You'd like to override the HttpServletResponse#addHeader() and HttpServletResponse#setHeader() method instead.

public void doFilter(ServletRequest request, final ServletResponse response, FilterChain chain) throws IOException, ServletException {
    final Map<String, List<String>> headers = new HashMap<String, List<String>>();
    chain.doFilter(request, new HttpServletResponseWrapper((HttpServletResponse) response) {
        @Override public void setHeader(String name, String value) {
            List<String> values = new ArrayList<String>();
            values.add(value);
            headers.put(name, values);
            super.setHeader(name, value);
        }

        @Override public void addHeader(String name, String value) {
            List<String> values = headers.get(name);
            if (values == null) {
                values = new ArrayList<String>(); 
                headers.put(name, values);
            }
            values.add(value);
            super.addHeader(name, value);
        }
    });
    logger.log(headers);
}

确实有更多方法可以设置标题，但是有点像servletcontainer实现它们都委托给这一个方法（我已在Tomcat和Glassfish中验证过它）。

There are indeed more methods which sets the headers, but in a bit decent servletcontainer implementation they all delegate to this one method (I've verified it in both Tomcat and Glassfish).

或者，您也可以使用servletcontainer特定的日志记录功能。例如，Tomcat似乎支持通过阀门。

Alternatively, you can also make use of servletcontainer specific logging capabilities. Tomcat for example seems to support logging of response headers by a valve.

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