如何以编程方式将AccessLogValve添加到Tomcat?
我正在开发Spring Boot应用程序,我想通过slf4j日志记录系统将Tomcat的访问日志路由到远程syslog。
既然是春天,我想避免触摸tomcat的server.xml文件。
我的AccessLogValve非常简单:
import java.io.CharArrayWriter;import org.apache.catalina.valves.AccessLogValve;
public class Log4JAccessLogValve extends AccessLogValve {
@Override
public void log(CharArrayWriter message) {
log.info(message.toString());
}
}
我希望可以使用这样的方法将其连接到Tomcat:
@Componentpublic class LogConfig {
@Autowired
private ServletContext servletContext;
@PostConstruct
public void setAccessLogValve() {
((ApplicationContextFacade)servletContext).addValve(new Log4JAccessLogValve());
}
}
除了addValve()方法不存在…
所以…任何人都知道我如何可以连接AccessLogValve?
对于开放访问日志到远程syslog的建议,我也持完全不同的态度,但是我们正在制作数十种微服务,因此它必须是一种非常标准化的方法,对于每个微服务都必须易于实现。
回答:
将这些答案结合到适用于springboot 2.0的东西中
import org.apache.catalina.valves.AbstractAccessLogValve;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.stereotype.Component;
import java.io.CharArrayWriter;
/**
* see https://www.baeldung.com/embeddedservletcontainercustomizer-configurableembeddedservletcontainer-spring-boot
*
*/
@Component
@Slf4j
public class CustomizeEmbeddedTomcatContainer implements WebServerFactoryCustomizer<TomcatServletWebServerFactory> {
@Override
public void customize(TomcatServletWebServerFactory factory) {
log.info("configuring embedded Tomcat");
TomcatSlf4jAccessValve accessLogValve = new TomcatSlf4jAccessValve();
accessLogValve.setEnabled(true);
/**
* for pattern format see https://tomcat.apache.org/tomcat-7.0-doc/api/org/apache/catalina/valves/AccessLogValve.html
*/
accessLogValve.setPattern("request: method=%m uri=\"%U\" response: statuscode=%s bytes=%b duration=%D(ms) client: remoteip=%a user=%u useragent=\"%{User-Agent}i\"");
factory.addContextValves(accessLogValve);
}
public static class TomcatSlf4jAccessValve extends AbstractAccessLogValve {
Logger httpAccessLogLogger = LoggerFactory.getLogger("http_access_log");
@Override
protected void log(CharArrayWriter message) {
httpAccessLogLogger.info(message.toString());
}
}
}
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