Question

我正在使用拦截器，它会在请求之前和之后拦截。这样做的目的是获取发送和返回的内容的大小，但是，我不知道如何获得答案，似乎响应没有方法来获取它

@Component
public class DataUsageInterceptor extends HandlerInterceptorAdapter {

    private static final Logger LOG = LoggerFactory.getLogger(CheckController.class);

    @Override
    public boolean preHandle(
            HttpServletRequest request,
            HttpServletResponse response,
            Object handler
    ) throws Exception {

        System.out.println("---- " + request.getContentLength() + "----------");

        return super.preHandle(request, response, handler);
    }

    @Override
    public void afterCompletion(
            HttpServletRequest request,
            HttpServletResponse response,
            Object handler, Exception ex
    ) throws Exception {

        System.out.println("---------- get length here ----------------");

    }
}

Answer 1

我认为您可以从响应标头中获取内容大小。它似乎是这样的：

response.getHeader("Content-Length");

供参考：

https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletResponse.html#getHeader(java.lang.String)

https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html（第14.13节内容长度）

获取响应内容的大小

1 个答案: