在設定檔application.yml裡面來設定tomcat accesslog日誌：
server: port: 80 tomcat: accesslog: enabled: true directory: D:\Documents\D_代码相关\J_java\sprintboot_study prefix: tomcat_access_log suffix: .log file-date-format: -yyyy-MM-dd pattern: '%{X-Real-IP}i - %{Host}i %t "%r" %{Content-Length}i %s %b %D "%{Referer}i" "%{User-Agent}i" %a "%I" "-"' rotate: true
日誌記錄格式(pattern)，形式參考：
nginx 日誌log_format：
log_format main '$http_x_real_ip - $http_host [$time_local] "$request" $request_length ' '$status $body_bytes_sent $request_time "$http_referer" ' '"$http_user_agent" $remote_addr "-" "-" ';
tomcat access log pattern：
pattern: '%{X-Real-IP}i - %{Host}i %t "%r" %{Content-Length}i' '%s %b %D "%{Referer}i"' '"%{User-Agent}i" %a "%I" "-"'
%{X-Real-IP}i： http X-Real_IP %{Host}i： http Host %t： Date and time, in Common Log Format %r： First line of the request (method and request URI) %{Content-Length}i： request length %s： HTTP status code of the response %b： Bytes sent, excluding HTTP headers, or ‘-’ if zero %D： Time taken to process the request, in millis %{Referer}i： http Referer %{User-Agent}i： http User-Agent %a： Remote IP address %I： Current request thread name (can compare later with stacktraces)
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