日志，获取logback日志文件路径，

        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment;filename="+new String((System.currentTimeMillis()+".log").getBytes("utf-8"),"ISO-8859-1"));
        OutputStream out = response.getOutputStream();
        LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
        String fileStr = ((RollingFileAppender) loggerContext.getLogger("ROOT").getAppender("FILE")).getFile();
        File file = new File(fileStr);
        BufferedReader br = new BufferedReader(new FileReader(file));
        String time = map.get("time");
        StringUtils.isEmptyReMsg(time,"XXX");
        int i=0;
        String line="";
        while (i<3000&&(line=br.readLine())!=null){
            i++;
            DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
            if(line.length()>25){
                try{
                    LocalDateTime parse = LocalDateTime.parse(line.substring(1,24), df);
                    LocalDateTime parse2 = LocalDateTime.parse(time, df);
                    if(parse.compareTo(parse2)<0){
                        break;
                    }
                }catch (Exception e){
                }
            }
            out.write((line+System.getProperty("line.separator")).getBytes());
        }
        br.close();
        out.flush();
        out.close();