获取HttpServletResponse出入参

Posted 2023-04-26

参考技术A package com.himo.Filter;

import com.alibaba.fastjson.JSON;

import org.apache.logging.log4j.ThreadContext;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.stereotype.Component;

import javax.servlet.*;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.util.Map;

import java.util.UUID;

/**

* 作者:修罗大人

* 时间:2018-11-15 16:46

* 描述:日志过滤器

*/

@Component

@WebFilter(filterName ="logFilter", urlPatterns ="/*")

public class LogFilterimplements Filter

private Loggerlogger = LoggerFactory.getLogger(this.getClass());

private static final StringignoreUrlRegex =".*((pay/)|(/index)|(/index/.*)|([.]((html)|(jsp)|(css)|(js)|(gif)|(png))))$";

@Override

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throws IOException, ServletException

ThreadContext.put("TId", UUID.randomUUID().toString());

HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;

// 请求html页面、js不打印日志

        if (httpServletRequest.getRequestURI().matches(ignoreUrlRegex))

ThreadContext.clearAll();

filterChain.doFilter(servletRequest,servletResponse);

return;



HttpServletRequest request = (HttpServletRequest) servletRequest;

logger.info("url: " + request.getRequestURL());//url

        logger.info("ip: " + request.getRemoteHost());//ip

        logger.info("method: "+request.getMethod());//post or get? or ?

        Map parameterMap = request.getParameterMap();

logger.warn("请求url参数:" + JSON.toJSONString(parameterMap));

try

ServletInputStream inputStream = request.getInputStream();

int len = request.getContentLength();

if (len >0)



byte[] bytes =new byte[len];

int i =0;

ByteArrayOutputStream bo =new ByteArrayOutputStream();

inputStream.read(bytes,i,len);

bo.write(bytes,i,len);

bo.flush();

bo.close();

String result = bo.toString();

logger.warn("请求体参数" + result);



catch (IOException e)

e.printStackTrace();



HttpServletResponse resp = (HttpServletResponse) servletResponse;

ResponseWrapper mResp =new ResponseWrapper(resp);// 包装响应对象 resp 并缓存响应数据

        filterChain.doFilter(request, mResp);

byte[] bytes = mResp.getBytes();// 获取缓存的响应数据

        if (bytes.length >0)



String responseStr =new String(bytes);

logger.warn("返回值:" + responseStr);



//        System.out.println("压缩前大小：" + bytes.length);

//        System.out.println("压缩前数据：" + new String(bytes,"utf-8"));

//        ByteArrayOutputStream bout = new ByteArrayOutputStream();

//        GZIPOutputStream gzipOut = new GZIPOutputStream(bout); // 创建 GZIPOutputStream 对象

//        gzipOut.write(bytes); // 将响应的数据写到 Gzip 压缩流中

//        gzipOut.flush();

//        gzipOut.close(); // 将数据刷新到  bout 字节流数组

//        byte[] bts = bout.toByteArray();

//        System.out.println("压缩后大小：" + bts.length);

//        resp.setHeader("Content-Encoding", "gzip"); // 设置响应头信息

//        resp.getOutputStream().write(bts); // 将压缩数据响应给客户端

   

@Override

    public void init(FilterConfig filterConfig)throws ServletException



@Override

    public void destroy()





package com.himo.Filter;

/**

* 作者:修罗大人

* 时间:2018-11-15 17:13

* 描述:ResponseWrapper

*/

import javax.servlet.ServletOutputStream;

import javax.servlet.WriteListener;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpServletResponseWrapper;

import java.io.*;

public class ResponseWrapperextends HttpServletResponseWrapper

private ByteArrayOutputStreambytes =new ByteArrayOutputStream();

private HttpServletResponseresponse;

private PrintWriterpwrite;

public ResponseWrapper(HttpServletResponse response)

super(response);

this.response = response;



@Override

    public ServletOutputStream getOutputStream()throws IOException

return new MyServletOutputStream(bytes);// 将数据写到 byte 中

   

/**

* 重写父类的 getWriter () 方法，将响应数据缓存在 PrintWriter 中

*/

    @Override

    public PrintWriter getWriter()throws IOException

try

pwrite =new PrintWriter(new OutputStreamWriter(bytes,"utf-8"));

catch (UnsupportedEncodingException e)

e.printStackTrace();



return pwrite;



/**

* 获取缓存在 PrintWriter 中的响应数据

*

    * @return

    */

    public byte[] getBytes()

if (null !=pwrite)

pwrite.close();

return bytes.toByteArray();



if (null !=bytes)

try

bytes.flush();

catch (IOException e)

e.printStackTrace();





return bytes.toByteArray();



class MyServletOutputStreamextends ServletOutputStream

private ByteArrayOutputStreamostream;

public MyServletOutputStream(ByteArrayOutputStream ostream)

this.ostream = ostream;



@Override

        public void write(int b)throws IOException

ostream.write(b);// 将数据写到 stream　中

       

@Override

        public boolean isReady()

return false;



@Override

        public void setWriteListener(WriteListener writeListener)

如何从 HttpServletResponse 获取 HTML 内容？

【中文标题】如何从 HttpServletResponse 获取 HTML 内容？

【英文标题】：How to get the HTML content from HttpServletResponse?

【发布时间】：2014-08-21 17:05:19

【问题描述】：

我已经设法在 tomcat 上为 servlet 设置了一个过滤器，但是 HttpServletResponse 仅具有获取响应标头的功能，而不是实际的 HTML 响应本身。一些阅读告诉我，我必须制作一个包装类，但我不知道该怎么做。经过一番苦恼后，我决定将其发布在 *** 上。

如何从 HttpServletResponse 中检索 HTML 内容？我需要将其保存为文本文件。

【参考方案1】：

您需要实现HttpServletRequestWrapper 接口，尤其是getWriter 和getOutputStream 方法，然后将该类提供给doFilter 方法。最后，您会将缓冲区的内容转储到文件中。

在这里检查一点类似的问题response wrapper to convert all output to uppercase