java-filter打印請(qǐng)求返回參數(shù)

1、1、對(duì) HttpServletRequestWrapper進(jìn)行封裝，先把數(shù)據(jù)保存到臨時(shí)byte，然后得到數(shù)據(jù)后，再把數(shù)據(jù)復(fù)制到request中2、對(duì)HttpServletResponseWrapper進(jìn)行封裝，同樣道理把數(shù)據(jù)輸出到ByteArrayOutputStream，得到數(shù)據(jù)后，再response.getWriter().write(result);3、 filter中對(duì)requestresponse封裝，filter.doFilter(requestWrapper, responseWrapper);還需要在web.xml配置 filter4、亂碼解決：responseWrapper中

2、輸出流設(shè)置編碼，response中也設(shè)置編碼即可解決亂碼問(wèn)題重要補(bǔ)充:對(duì)經(jīng)過(guò) filter 后 Enumeration ks=request.getParameterNames();無(wú)法獲取正確參數(shù)的問(wèn)題，查看 tomcat 對(duì) request 參數(shù)的處理，解決方式為覆蓋HttpServletRequestWrapper 中的getParameterNames()和 getParameter()函數(shù)，因?yàn)閠omcat 讀取一次請(qǐng)求參數(shù)request.getParameterNames()后就將原參數(shù)歸 0，所以需要覆蓋原 HttpServletRequestWrapper 中的部分函數(shù)。5、R

3、equestWrapper如下package com.niuwa.p2p.filter;/* date 2016年 9 月 1 日 上午 10:24:05*/import java.io.BufferedReader;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.Collections;import java.util.Enumeration;import jav

4、a.util.LinkedHashMap;import java.util.Map;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import org.apache.catalina.connector.RequestFacade;import org.apache.http.message.BasicNameValuePair;import com.alibaba.f

5、astjson.JSON;import com.itextpdf.text.List;import jodd.io.StreamUtil;/* 復(fù)制 request 中的 bufferedReader中的值* date 2016年 9 月 1 日 上午 10:53:06*/public class RequestWrapper extends HttpServletRequestWrapper private final byte body;private final Map paramHashValues = new LinkedHashMap();private boolean didQu

6、eryParameters=false; /參考o(jì)rg.apache.tomcat.util.http.Parameters/用 tomcat 建立一個(gè)普通的Java web ，out.println(request)-結(jié)果為：org.apache.catalina.connector.RequestFacade149d226/用 strut2 框架的話， out.println(request）-結(jié)果為：org.apache.struts2.dispatcher.StrutsRequestWrapper1e17cff/Enumeration ks=request.getParameterNa

7、mes();/while(ks.hasMoreElements()/String key=ks.nextElement();/String value=request.getParameter(key);/nvps.add(new BasicNameValuePair(key, value);/(key:+key+,value:+value);/* 這個(gè)必須加 ,復(fù)制 request 中的 bufferedReader中的值* param request* throws IOException*/public RequestWrapper(HttpServletReque

8、st request) throws IOException super(request);initParamHashValues();body = StreamUtil.readBytes(request.getReader(), UTF-8);/這一句和上一句同時(shí)只能有一個(gè)Overridepublic BufferedReader getReader() throws IOException return new BufferedReader(new InputStreamReader(getInputStream();Overridepublic ServletInputStream g

9、etInputStream() throws IOException final ByteArrayInputStream bais = new ByteArrayInputStream(body);return new ServletInputStream() Overridepublic int read() throws IOException return bais.read();Overridepublic Enumeration getParameterNames() initParamHashValues();return Collections.enumeration(para

10、mHashValues.keySet();Overridepublic String getParameter(String name) initParamHashValues();return (String) paramHashValues.get(name);public void initParamHashValues()if (!didQueryParameters) didQueryParameters=true;Enumeration ks=super.getParameterNames();while(ks.hasMoreElements()String key=ks.next

11、Element();String value=super.getParameter(key);paramHashValues.put(key, value);System.out.println(initParamHashValues:+JSON.toJSON(paramHashValues);6、 ResponseWrapperimport java.io.ByteArrayOutputStream;import java.io.CharArrayWriter;import java.io.IOException;import java.io.OutputStreamWriter;impor

12、t java.io.PrintWriter;import java.io.UnsupportedEncodingException;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpServletResponseWrapper;public class ResponseWrapper extends HttpServletResponseWrapper /*This class implements an out

13、put stream in which the data is written intoa byte array.The buffer automatically grows as data is written to it. The data can beretrieved using toByteArray() and toString().Closing a ByteArrayOutputStream has no effect. The methods in this class can becalled after the stream has been closed without

14、 generating an IOException.*/private ByteArrayOutputStream buffer = null;/輸出到byte arrayprivate ServletOutputStream out = null;private PrintWriter writer = null;public ResponseWrapper(HttpServletResponse resp) throws IOException super(resp);buffer = new ByteArrayOutputStream();/ 真正存儲(chǔ)數(shù)據(jù)的流 out = newWap

15、peredOutputStream(buffer);writer = new PrintWriter(new OutputStreamWriter(buffer,this.getCharacterEncoding();/*重載父類獲取outputstream的方法*/Overridepublic ServletOutputStream getOutputStream() throws IOException return out;/*重載父類獲取writer的方法 */Overridepublic PrintWriter getWriter() throws UnsupportedEncodi

16、ngException return writer;/*重載父類獲取flushBuffer的方法*/Overridepublic void flushBuffer() throws IOException if (out != null) out.flush();if (writer != null) writer.flush();Overridepublic void reset() buffer.reset();/*將 out 、writer中的數(shù)據(jù)強(qiáng)制輸出到WapperedResponse 的 buffer里面，否則取不到數(shù)據(jù) */public byte getResponseData(

17、) throws IOException flushBuffer();return buffer.toByteArray();/*內(nèi)部類，對(duì)ServletOutputStream進(jìn)行包裝*/private class WapperedOutputStream extends ServletOutputStream private ByteArrayOutputStream bos = null;public WapperedOutputStream(ByteArrayOutputStream stream) throwsIOException bos = stream;Overridepubl

18、ic void write(int b) throws IOException bos.write(b);Overridepublic void write(byte b) throws IOException bos.write(b, 0, b.length);7、 UrlFilter/*url過(guò)濾器 , 防止暴露接口訪問(wèn)方式*/import java.io.BufferedReader;import java.io.IOException;import java.io.PrintWriter;import java.util.Map;import javax.servlet.Filter;

19、import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResp

20、onse;import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class UrlFilter implements Filter static Logger logger = LoggerFactory.getLogger(UrlFilter.class);ServletContext context;Overridepublic void destroy() Overridepublic void doFilter(ServletRequest request, ServletResponse response,Filt

21、erChain filter) throws IOException, ServletException HttpServletRequest r = (HttpServletRequest) request;String path = r.getQueryString();String url = r.getRequestURI();RequestWrapper requestWrapper = null;String repalceUrl = url.replaceAll(/, );if (null != repalceUrl) repalceUrl = repalceUrl.trim()

22、; else return;(nn-path);url: + url + & queryString: +ResponseWrapperresponseWrapper=newResponseWrapper(HttpServletResponse)response);if (request instanceof HttpServletRequest) requestWrapper = new RequestWrapper(HttpServletRequest) request);try Map map = request.getParameterMap();logger.i

23、nfo(map: + map);BufferedReader bufferedReader = requestWrapper.getReader();String line;StringBuilder sb = new StringBuilder();while (line = bufferedReader.readLine() != null) sb.append(line);(request.getReader: + sb.toString(); catch (Exception e) TODO: handle exceptionlogger.error(p2ps doFilter :, e);if (null = requestWrapper) filter.doFilter(request, response); else filter.doFil