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      轉載-Spring Boot之 Filter(示例:打印request、response日志)

      網上有很多采用spring filter機制打印request/response日志的博客, 大都不能很好工作, 下面這個博客寫的不錯.

      https://blog.csdn.net/jy02268879/article/details/84243950

      作者用到了下面兩個第三方庫, 其中 apache lang3 的 StringUtils 可以使用 Hutool 庫代替.  jodd 庫是一個非常優秀的工具包.

      • import jodd.io.StreamUtil;
      • import org.apache.commons.lang3.StringUtils;

      pom.xml 引入對應的 jodd-core 包.

                  <dependency>
                      <groupId>org.jodd</groupId>
                      <artifactId>jodd-core</artifactId>
                      <version>${jodd.all.version}</version>
                  </dependency>

       

       

      下面內容摘自  https://blog.csdn.net/jy02268879/article/details/84243950

      ===========================================

      Filter(過濾器)

      ===========================================
      一個請求可以被多個過濾器攔截到,會依次進入各個Filter中,放行后直至進入Servlet,Servlet處理請求結束后,回到各個Filter繼續執行后面的代碼,先執行的Filter,后執行完(Filter是個棧結構,先進后出)。

      例如:這里有5個filter: A,B,C,D,E

      執行filter的前置處理的順利是A,B,C,D,E

      那么執行filter的后置處理的順序是E,D,C,B,A

      一個請求進來以后的執行順序:

      Filter前置處理---->Interceptor(攔截器)前置處理---->正常的controller處理---->Interceptor后置處理---->Filter后置處理

       

      ===========================================
      一.用@WebFilter注冊過濾器

      ===========================================

       

       

      ---------------------------------------------------------
       1.實現filter接口,或者繼承filter的實現類, 

      ---------------------------------------------------------

      RequestFilter.java 繼承OncePerRequestFilter確保一次請求只通過一次該filter

      換言之一次請求不會通過兩次RequestFilter,一次請求不會重復執行自定義RequestFilter中的doFilterInternal方法

      package com.sid.util.LogRequestResponse;
       
      import org.slf4j.Logger;
      import org.slf4j.LoggerFactory;
      import org.springframework.core.annotation.Order;
      import org.springframework.web.filter.OncePerRequestFilter;
       
      import javax.servlet.*;
      import javax.servlet.annotation.WebFilter;
      import javax.servlet.http.HttpServletRequest;
      import javax.servlet.http.HttpServletResponse;
      import java.io.BufferedReader;
      import java.io.IOException;
       
      /**
       * @program: springboot
       * @description:
       * @author: Sid
       * @date: 2018-11-19 09:21
       * @since: 1.0
       **/
      @Order(0)
      /**
       * 注冊過濾器
       * */
      @WebFilter(filterName = "RequestResponseLogFilter", urlPatterns = "/*")
      public class RequestFilter extends OncePerRequestFilter {
          private static final Logger logger = LoggerFactory.getLogger(RequestFilter.class);
       
          @Override
          protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
              String path = request.getQueryString();
              String servletPath = request.getServletPath();
              String url = request.getRequestURI();
              RequestWrapper requestWrapper = null;
       
       
              StringBuilder sb = new StringBuilder();
              if (request instanceof HttpServletRequest) {
                  requestWrapper = new RequestWrapper(request);
                      BufferedReader bufferedReader = requestWrapper.getReader();
                      String line;
                      while ((line = bufferedReader.readLine()) != null) {
                          sb.append(line);
                      }
              }
       
              ResponseWrapper responseWrapper=new ResponseWrapper( response);
       
              if (null == requestWrapper) {
                  filterChain.doFilter(request, response);
              } else {
                  filterChain.doFilter(requestWrapper, responseWrapper);
              }
              logger.info("========================》  url:" + url + " & queryString:" + path+" & servletPath:"+servletPath);
              logger.info("========================》request uri: {}",request.getRequestURI());
              logger.info("========================》request ContentType: {}",request.getContentType());
              logger.info("========================》request param: {}",sb.toString());
       
              logger.info("========================》response status: {}",response.getStatus());
              logger.info("========================》response ContentType: {}",response.getContentType());
       
       
              String result=new String(responseWrapper.getResponseData());
              ServletOutputStream outputStream = response.getOutputStream();
              outputStream.write(result.getBytes());
              outputStream.flush();
              outputStream.close();
              // 打印response
              logger.info("========================》response return data: {} \t" + result);
       
          }
       
      } 

       



      ---------------------------------------------------------
       2.在spring-boot啟動類上加注解@ServletComponentScan
       ---------------------------------------------------------
       

      @SpringBootApplication
      @ServletComponentScan
      public class App {
          public static void main(String[] args) {
              SpringApplication.run(App.class, args);
          }
      }


       ===========================================
       二、用FilterRegistrationBean注冊過濾器

      ===========================================

      RequestFilterConfiguration.java

      package com.sid.util.LogRequestResponse;
       
      import org.springframework.boot.web.servlet.FilterRegistrationBean;
      import org.springframework.context.annotation.Bean;
      import org.springframework.context.annotation.Configuration;
       
      /**
       * @program: springboot
       * @description:
       * @author: Sid
       * @date: 2018-11-19 13:48
       * @since: 1.0
       **/
      @Configuration
      public class RequestFilterConfiguration {
          @Bean
          public FilterRegistrationBean authFilterRegistrationBean() {
              FilterRegistrationBean registration = new FilterRegistrationBean();
              registration.setFilter(new RequestFilter()); //設置自定義的Filter
              registration.addUrlPatterns("/*");  //設置過濾路徑
              registration.setName("RequestFilter"); //設置過濾器名稱
              registration.setOrder(1);   //設置過濾器順序
              //registration.addInitParameter("paramName", "paramValue");  //設置初始化參數 這里不用
              return registration;
          }
      } 


      ----------------------------------------------------
      RequestWrapper的實現

      ----------------------------------------------------

      package com.sid.util.LogRequestResponse;
       
      import jodd.io.StreamUtil;
      import org.apache.commons.lang3.StringUtils;
       
      import java.io.*;
      import java.nio.charset.Charset;
      import java.util.Enumeration;
       
      import javax.servlet.ReadListener;
      import javax.servlet.ServletInputStream;
      import javax.servlet.ServletRequest;
      import javax.servlet.http.HttpServletRequest;
      import javax.servlet.http.HttpServletRequestWrapper;
       
       
      /**
       * @program: springboot
       * @description:
       * @author: Sid
       * @date: 2018-11-19 12:54
       * @since: 1.0
       **/
      public class RequestWrapper extends HttpServletRequestWrapper {
          private final byte[] body;
       
          /**
           * 這個必須加,復制request中的bufferedReader中的值
           * @param request
           * @throws IOException
           */
          public RequestWrapper(HttpServletRequest request) throws IOException {
              super(request);
              body = getBodyString(request);
          }
       
          /**
           * 獲取請求Body
           *
           * @param request
           * @return
           */
          public byte[] getBodyString(final ServletRequest request) throws IOException {
              String contentType = request.getContentType();
              String bodyString ="";
       
              if (StringUtils.isNotBlank(contentType) && (contentType.contains("multipart/form-data") || contentType.contains("x-www-form-urlencoded"))){
       
                  Enumeration<String> pars=request.getParameterNames();
       
                  while(pars.hasMoreElements()){
       
                      String n=pars.nextElement();
       
                      bodyString+=n+"="+request.getParameter(n)+"&";
       
                  }
       
                  bodyString=bodyString.endsWith("&")?bodyString.substring(0, bodyString.length()-1):bodyString;
       
                  return bodyString.getBytes(Charset.forName("UTF-8"));
       
              }else {
       
                  return StreamUtil.readBytes(request.getReader(), "UTF-8");
       
              }
          }
       
       
          @Override
          public BufferedReader getReader() throws IOException {
              return new BufferedReader(new InputStreamReader(getInputStream()));
          }
       
          @Override
          public ServletInputStream getInputStream() throws IOException {
              final ByteArrayInputStream bais = new ByteArrayInputStream(body);
              return new ServletInputStream() {
       
                  @Override
                  public boolean isFinished() {
                      return false;
                  }
       
                  @Override
                  public boolean isReady() {
                      return false;
                  }
       
                  @Override
                  public void setReadListener(ReadListener listener) {
       
                  }
       
                  @Override
                  public int read() throws IOException {
                      return bais.read();
                  }
              };
          }
      } 

       

      ----------------------------------------------------
      ResponseWrapper的實現

      ----------------------------------------------------

      package com.sid.util.LogRequestResponse;
       
      import javax.servlet.WriteListener;
      import javax.servlet.http.HttpServletResponseWrapper;
       
      import java.io.ByteArrayOutputStream;
      import java.io.IOException;
      import java.io.OutputStreamWriter;
      import java.io.PrintWriter;
      import java.io.UnsupportedEncodingException;
       
      import javax.servlet.ServletOutputStream;
      import javax.servlet.http.HttpServletResponse;
       
      /**
       * @program: springboot
       * @description:
       * @author: Sid
       * @date: 2018-11-19 11:55
       * @since: 1.0
       **/
      public class ResponseWrapper extends HttpServletResponseWrapper {
          /**
           * This class implements an output stream in which the data is written into a byte array.
           * The buffer automatically grows as data is written to it. The data can be retrieved using toByteArray() and toString().
           Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
           */
          private ByteArrayOutputStream buffer = null;//輸出到byte array
          private ServletOutputStream out = null;
          private PrintWriter writer = null;
       
          public ResponseWrapper(HttpServletResponse resp) throws IOException {
              super(resp);
              buffer = new ByteArrayOutputStream();// 真正存儲數據的流
              out = new WapperedOutputStream(buffer);
              writer = new PrintWriter(new OutputStreamWriter(buffer, this.getCharacterEncoding()));
          }
       
          /** 重載父類獲取outputstream的方法 */
          @Override
          public ServletOutputStream getOutputStream() throws IOException {
              return out;
          }
       
          /** 重載父類獲取writer的方法 */
          @Override
          public PrintWriter getWriter() throws UnsupportedEncodingException {
              return writer;
          }
       
          /** 重載父類獲取flushBuffer的方法 */
          @Override
          public void flushBuffer() throws IOException {
              if (out != null) {
                  out.flush();
              }
              if (writer != null) {
                  writer.flush();
              }
          }
       
          @Override
          public void reset() {
              buffer.reset();
          }
       
          /** 將out、writer中的數據強制輸出到WapperedResponse的buffer里面,否則取不到數據 */
          public byte[] getResponseData() throws IOException {
              flushBuffer();
              return buffer.toByteArray();
          }
       
          /** 內部類,對ServletOutputStream進行包裝 */
          private class WapperedOutputStream extends ServletOutputStream {
              private ByteArrayOutputStream bos = null;
       
              public WapperedOutputStream(ByteArrayOutputStream stream) throws IOException {
                  bos = stream;
              }
       
              @Override
              public void write(int b) throws IOException {
                  bos.write(b);
              }
       
              @Override
              public void write(byte[] b) throws IOException {
                  bos.write(b, 0, b.length);
              }
       
              @Override
              public boolean isReady() {
                  return false;
              }
       
              @Override
              public void setWriteListener(WriteListener listener) {
       
              }
          }
      } 

       

      posted @ 2021-07-15 16:07  harrychinese  閱讀(1932)  評論(0)    收藏  舉報
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