从HttpServletResponse Java获取responseBody

我想检查响应主体，读取响应，然后执行其他一些操作操作主体，然后返回响应

如何在logger中准确记录响应？ 如果我想操纵响应的内容，我该怎么做

自定义过滤器.java

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Order(1)
@WebFilter(urlPatterns = {"/*"}, description = "My delay filter ")
public class CustomFilter implements Filter{
    
    private static final Logger logger = Logger.getLogger(CustomFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        
        try {
            if (httpRequest.getRequestURL().toString().contains("download")) {
                logger.debug(httpResponse); //want to log response body

                
            }
        } catch (Exception e) {
            logger.error("Exception in CustomFilter.doFilter(): ", e);
        }
        
        chain.doFilter(request, response);
    }


    @Override
    public void destroy() {
        // TODO Auto-generated method stub
        
    }

}

---

假设包括SpringWeb都可以，那么有一个

contentcachingresponsewraper

。您的过滤器可以从接收到的响应中构造其中一个（并将其返回到链的上游），并从中读取和记录响应（因为它将允许您重用流）。

package com.biclinical.rmm.controller;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.web.util.ContentCachingRequestWrapper;
import org.springframework.web.util.ContentCachingResponseWrapper;
import org.springframework.web.util.WebUtils;

import com.biclinical.rmm.utility.ServiceUtils;

@Component
@Order(1)
@WebFilter(urlPatterns = { "/*" })
public class DownloadFileFilter implements Filter {

    private static final Logger logger = Logger.getLogger(DownloadFileFilter.class);

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

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

        HttpServletRequest requestToCache = new ContentCachingRequestWrapper((HttpServletRequest) request);
        HttpServletResponse responseToCache = new ContentCachingResponseWrapper((HttpServletResponse) response);

        try {
            if (requestToCache.getRequestURL().toString().contains("/download")) {
                chain.doFilter(request, responseToCache);
                getResponseData(responseToCache);

            } else {
                chain.doFilter(request, response);
            }
        } catch (Exception e) {
            logger.error("Exception in CustomFilter.doFilter(): ", e);
        }

    }

    private static void getResponseData(HttpServletResponse response) throws Exception {
        ContentCachingResponseWrapper wrapper = WebUtils.getNativeResponse(response,
                ContentCachingResponseWrapper.class);
        if (wrapper != null) {
            byte[] buf = wrapper.getContentAsByteArray();
            if (buf.length > 0) {
                String payload = new String(buf, 0, buf.length, wrapper.getCharacterEncoding());
                logger.debug("Response Richa :" + payload);
                wrapper.copyBodyToResponse();
            }
        }
    }

    @Override
    public void destroy() {
    }

}