java Spring下如何配置Logback
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How to configure Logback under Spring
提问by Aleksandr Dubinsky
Most of the examples for configuring Logback use logback.xml. However, my application uses Spring features of profilesand PropertySourcesPlaceholderConfigurerto inject environment-specific configuration into components that need it. What is the right way to configure Logback in a programmatic way just like my other Spring components?
大多数配置 Logback 的示例使用 logback.xml。但是，我的应用程序使用配置文件和PropertySourcesPlaceholderConfigurer 的Spring 功能将特定于环境的配置注入需要它的组件中。就像我的其他 Spring 组件一样，以编程方式配置 Logback 的正确方法是什么？
回答by Aleksandr Dubinsky
As orid pointed out, the official way to use Logback in Spring is with the Logback Spring extension.
正如 orid 指出的那样，在 Spring 中使用 Logback 的官方方法是使用Logback Spring 扩展。
The really cool thing is that the Logback Spring extension starts before Spring or the servlet and stores log messages until the Appenders are configured. (Simple appenders will be available immediately, while those that need Spring are proxied through DelegatingLogbackAppender).
真正酷的是 Logback Spring 扩展在 Spring 或 servlet 之前启动并存储日志消息，直到配置了 Appender。（简单的 appender 将立即可用，而那些需要 Spring 的则通过 代理DelegatingLogbackAppender）。
In addition it allows you to:
此外，它还允许您：
- Use SLF4J's java.util.logging bridge.
- Specify the
logback.xmllocation using a Spring resource pathand system propertyplaceholders. - Use the pre-set system property
webapp.root(path to unpacked WAR directory) inside thelogback.xmlfor setting log file paths, etc.
回答by Sanjay
In one of our projects, we had coded it like this:
在我们的一个项目中，我们是这样编码的：
import java.io.IOException;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Component;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.util.StatusPrinter;
@Component
public class InitializationService implements ApplicationListener<ContextRefreshedEvent> {
@Value("${logbackErrorMailPassword}")
private String logbackErrorMailPassword;
@Value("${supportEmail}")
private String supportEmail;
@Value("${spring.profiles.active}")
private String env;
@Value("${log.dir}")
private String logDir;
@Value("${log.name}")
private String logName;
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
try {
configureLogback();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void configureLogback() throws IOException {
// assume SLF4J is bound to logback in the current environment
LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
try {
JoranConfigurator jc = new JoranConfigurator();
jc.setContext(context);
context.reset(); // override default configuration
// inject the name of the current application as "application-name"
// property of the LoggerContext
context.putProperty("LOG_DIR", logDir);
context.putProperty("LOG_NAME", logName);
context.putProperty("ERROR_MAIL_PASSWORD", logbackErrorMailPassword);
context.putProperty("SUPPORT_EMAIL_ID", supportEmail);
context.putProperty("ENV", env);
//jc .doConfigure(servletContext.getRealPath("/WEB-INF/my-logback.xml"));
jc.doConfigure(new ClassPathResource("my-logback.xml").getInputStream());
} catch (JoranException je) {
// StatusPrinter will handle this
}
StatusPrinter.printInCaseOfErrorsOrWarnings(context);
}
}
my-logback.xmlwas residing at src/main/resources, looking like this:
my-logback.xml住在src/main/resources，看起来像这样：
<configuration debug="true" scan="true" scanPeriod="10 minutes">
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<Pattern>%date %level [%thread] %logger %msg%n</Pattern>
</encoder>
</appender>
<appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${LOG_DIR}${LOG_NAME}.log</File>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<FileNamePattern>
${LOG_DIR}${LOG_NAME}-%d.%i.log.gz
</FileNamePattern>
<TimeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<MaxFileSize>10MB</MaxFileSize>
</TimeBasedFileNamingAndTriggeringPolicy>
</rollingPolicy>
<encoder>
<Pattern>%date %level [%thread] %logger %msg%n</Pattern>
</encoder>
</appender>
<appender name="EMAIL" class="ch.qos.logback.classic.net.SMTPAppender">
<filter class="ch.qos.logback.classic.filter.ThresholdFilter">
<!-- deny all events with a level below ERROR -->
<level>ERROR</level>
</filter>
<smtpHost>xxxxxx.bluehost.com</smtpHost>
<smtpPort>465</smtpPort>
<username>xxxxxxx+xxxxx.com</username>
<password>${ERROR_MAIL_PASSWORD}</password>
<SSL>true</SSL>
<to>${SUPPORT_EMAIL_ID}</to>
<!-- Multiple to elements are permitted -->
<from>[email protected]</from>
<subject>[${ENV}] ERROR in ${LOG_NAME}</subject>
<cyclicBufferTracker class="ch.qos.logback.core.spi.CyclicBufferTracker">
<bufferSize>1</bufferSize>
</cyclicBufferTracker>
<layout class="ch.qos.logback.classic.PatternLayout">
<pattern>%date %-5level %logger{35} - %message%n</pattern>
</layout>
</appender>
<logger name="javax.net" level="info"/>
<logger name="javax.management" level="info"/>
<logger name="org.springframework" level="info"/>
<logger name="org.compass" level="info"/>
<logger name="org.tuckey" level="info"/>
<root level="info">
<appender-ref ref="CONSOLE" />
<appender-ref ref="ROLLING" />
<appender-ref ref="EMAIL" />
</root>
</configuration>
