gerBinder.getSingleton().getLoggerFactory();
case 4:
return NOP_FALLBACK_FACTORY;
default:
throw new IllegalStateException("Unreachable code");
}
}
StaticLoggerBinder 类中，
private static StaticLoggerBinder SINGLETON = new StaticLoggerBinder();
private LoggerContext defaultLoggerContext = new LoggerContext();
static {
SINGLETON.init();
}
void init() {
try {
try {
// 自动配置，autoConfig 点进去
(new ContextInitializer(this.defaultLoggerContext)).autoConfig();
} catch (JoranException var2) {
Util.report("Failed to auto configure default logger context", var2);
}
if (!StatusUtil.contextHasStatusListener(this.defaultLoggerContext)) {
StatusPrinter.printInCaseOfErrorsOrWarnings(this.defaultLoggerContext);
}
this.contextSelectorBinder.init(this.defaultLoggerContext, KEY);
this.initialized = true;
} catch (Exception var3) {
Util.report("Failed to instantiate [" + LoggerContext.class.getName() + "]", var3);
}
}
ContextInitializer 类中，
// 此处的静态常量，表示的是logback的配置文件名
public static final String AUTOCONFIG_FILE = "logback.xml";
public static final String TEST_AUTOCONFIG_FILE = "logback-test.xml";
public static final String CONFIG_FILE_PROPERTY = "logback.configurationFile";
final LoggerContext loggerContext;
//
public void autoConfig() throws JoranException {
StatusListenerConfigHelper.installIfAsked(this.loggerContext);
// 没有任何配置文件时url为null
URL url = this.findURLOfDefaultConfigurationFile(true);
if (url != null) {
// 读取自定义的配置文件，logback.xml文件配置生效
this.configureByResource(url);
} else {
Configurator c = (Configurator)EnvUtil.loadFromServiceLoader(Configurator.class);
if (c != null) {
try {
c.setContext(this.loggerContext);
c.configure(this.loggerContext);
} catch (Exception var4) {
throw new LogbackException(String.format("Failed to initialize Configurator: %s using ServiceLoader", c != null ? c.getClass().getCanonicalName() : "null"), var4);
}
} else {
// 这一段代码保证了，没有任何配置文件时，也可以进行基础的自动配置，进行日志输出
BasicConfigurator basicConfigurator = new BasicConfigurator();
basicConfigurator.setContext(this.loggerContext);
basicConfigurator.configure(this.loggerContext);
}
}
}
3 日志滚动配置
需要注意在linux下执行的路径问题
<configuration>
<!-- 加入监听器,可以在监听器中设置 ${LOG_PATH}和${PROJECT_NAME} 的值，从而实现指定日志输出路径的效果 -->
<!-- 也可以使用 ${user.dir:-.}/logs/xxxx.log, user.dir 表示执行运行jar包命令时所在的路径 -->
<contextListener class="org.example.com.smy.CustomLogContextListener" />
<appender name="dailyRollingFileAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${LOG_PATH}/${PROJECT_NAME}/logs/LogsPathTest.log</File>
<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
<!--日志文件输出的文件名，.gz 表示开启文件压缩-->
<FileNamePattern>${LOG_PATH}/${PROJECT_NAME}/logs/LogsPathTest.%d{yyyy-MM-dd}.%i.log.gz</FileNamePattern>
<!--日志文件保留天数-->
<MaxHistory>15</MaxHistory>
<!--日志文件最大的大小-->
<MaxFileSize>2MB</MaxFileSize>
</rollingPolicy>
<encoder>
<Pattern>%date{yyyy-MM-dd HH:mm:ss}\t%level\t%log