如何在篩選器中獲取篩選器httpservletresponse outputstream錯誤消息

Question

我使用spring 4和篩選器我在servletResponse中得到了一些錯誤響應。它包含帶有錯誤消息的outputstream。 如何在輸出流中獲取此錯誤消息並審覈到我的應用程序？

try{    
      filterChain.doFilter(wrappedRequest, servletResponse); 
      HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse; 
      LOGGER.info("Basic Authenticate HttpServletResponse code {}"+httpServletResponse.getStatus()); 

      httpServletResponse.getOutputStream(); 
// I need to read this outputstream, its contains error message.? 




    }catch(Exception e){ 
     LOGGER.error("Error Basic Authenticate Error :{}", e); 
     HttpServletResponse httpServletResponse = (HttpServletResponse) servletResponse; 
     AtomicInteger statusCode = new AtomicInteger(httpServletResponse.getStatus()); 
     Response response = ResponseUtil.populateResponse(statusCode, e.getMessage().toString(), 0); 
     httpServletResponse.sendError(httpServletResponse.getStatus(), e.getMessage()); 
     auditService.updateRestAuditRecord(auditId,StringUtils.EMPTY, response); 
    } 

Answer 1

關鍵是裝飾者類HttpServletResponseWrapper。根據您的具體需求調整這些步驟：

1. 完全讀取您想審覈的流類似於字節緩衝區。
2. 做你的審計任務。
3. 擴展HttpServletResponseWrapper，覆蓋getOutputStream()並返回一個擴展名爲ServletOutputStream的擴展字節緩衝區。
4. 將HttpServletResponseWrapper傳遞給鏈中的下一個下游過濾器。