：LogFactory的实现类，真正获取日志对象的地方； Log4JLogger：对log4j的日志对象封装； Jdk14Logger：对JDK1.4的日志对象封装； Jdk13LumberjackLogger...(LogFactory.class); String classLoaderName; try { ClassLoader classLoader...对象，此步骤分为4中方式： (1)在系统属性中查找“org.apache.commons.logging.LogFactory”属性的值，根据值生成LogFactory对象； (2)通过资源...“META-INF/services/org.apache.commons.logging.LogFactory”文件，获取的值生成LogFactory对象； (3)通过配置文件commons-logging.properties...，获取以“org.apache.commons.logging.LogFactory”为key的值，根据值生成logFactory； (4)如果以上均不成功，则创建系统默认的日志工厂：org.apache.commons.logging.impl.LogFactoryImpl
https://github.com/unclehh/mybatis-review.git 这是基本使用： @Test public void log() { LogFactory.useLog4JLogging...(); Log log = LogFactory.getLog(LogFactoryTest.class); logSomething(log); assert log.getClass...().getName() == Log4jImpl.class.getName(); } 一、LogFactory的初始化 这里是在静态代码块里，加载所有的log实现类，包括slf4j、common logging...LogFactory.useLog4JLogging()，第一步会初始化Logfactory的logConstructor构造器，mybatis对上面几种log按顺序加载，如果加载成功了一个，后面的就不会再加载了...二、LogFactory.getLog 在第一步的基础上，有了特定的构造器，就可以获取特定的log对象了。 三、总结 mybatis的日志系统，使用工厂模式，包装模式，代理模式，使之扩展性很好。
源码分析——LogFactory 2.5.1. LogFactory 基本关系回顾 2.5.2....LogFactory 最常用方法 上述获取Log的过程大致分成2个阶段 获取 LogFactory； 通过 LogFactory 的 getInstance 接口获取 Log； 2.5.3....获取 LogFactory 的过程解析 1. LogFactory 的关键常量 2....LogFactory实现类查找过程： 尝试通过系统属性【org.apache.commons.logging.LogFactory】值获取; 尝试通过 SPI 模式【META-INF/services...使用的都是 JCL 默认提供的 LogFactory 实现类 LogFactoryImpl。
One particular // property may also control which LogFactory concrete subclass is // used, but...，其是否指定factory // Determine which concrete LogFactory subclass to use. // First, try a global system...class wasn't compatible with LogFactory // for some reason, a ClassCastException will be...加载具体实现的步骤如下：从vm系统属性org.apache.commons.logging.LogFactory使用SPI服务发现机制，发现org.apache.commons.logging.LogFactory...可以确定，如果日志实现提供者只要实现该接口，并且使用继承自org.apache.commons.logging.LogFactory的子类创建Log，必然可以构建一个松耦合的日志系统。
org.apache.ibatis.logging.slf4j.Slf4jImpl; import org.apache.ibatis.logging.stdout.StdOutImpl; public final class LogFactory...extends Log> logConstructor; //日志工厂的私有构造器，即它不能被实例化 private LogFactory() { } public static...static { tryImplementation(new Runnable() { public void run() { LogFactory.useSlf4jLogging...}); tryImplementation(new Runnable() { public void run() { LogFactory.useJdkLogging...}); tryImplementation(new Runnable() { public void run() { LogFactory.useNoLogging
org.apache.ibatis.session.Configuration(environment); // org.apache.ibatis.logging.LogFactory.useLog4J2Logging.../ } // return MyBatisTestConfig.environment; // } 最后发现使用这句就可以了 org.apache.ibatis.logging.LogFactory.useSlf4jLogging...(); org.apache.ibatis.logging.LogFactory.useLog4JLogging(); org.apache.ibatis.logging.LogFactory.useJdkLogging...(); org.apache.ibatis.logging.LogFactory.useCommonsLogging(); org.apache.ibatis.logging.LogFactory.useStdOutLogging
因为在其内部都是使用的是一个默认的LogManager.LogFactory 静态的 NLog.LogFactory 对象, 所以在多次初始化的时候会发生配置覆盖的情况....ServiceCollection(); user2_services.AddLogging(logBuilder=>{ logBuilder.AddNLog(...) }) 所以, 我们要解决这个问题则要自定义使用的的LogFactory.... var nlogFactory = new NLog.LogFactory(new NLogLoggingConfiguration(configuration.GetSection("active_user_nlog_options...nlogFactory ); loggerBuilder.AddProvider(nlogLoggerProvider); //或者 loggerBuilder.AddNLog(sp => new NLog.LogFactory
::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation(LogFactory...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory...::useJdkLogging); tryImplementation(LogFactory::useNoLogging); } private LogFactory() { ...::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation(LogFactory...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory
::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation(LogFactory...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory...::useJdkLogging); tryImplementation(LogFactory::useNoLogging); } private LogFactory() {...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory...::useJdkLogging); tryImplementation(LogFactory::useNoLogging); } private LogFactory() {
此外，它还定义了LogFactory日志工厂，以便于屏蔽日志工具实例的创建细节，让用户使用起来更简单。 如果是你该如何设计这个功能？...定义一个LogFactory日志工厂，它会根据我们项目中引入的某个日志打印工具jar包，创建一个具体的日志打印工具实例。 看起来，不错。...但是，再仔细想想，LogFactory中如何判断项目中引入了某个日志打印工具jar包才创建相应的实例呢？...再分析LogFactory的代码 ?...再回到前面LogFactory的setImplementation方法 ? 它会先找到实现了Log接口的类的构造器，返回将该构造器赋值给全局的logConstructor。
static final Logger logger = LoggerFactory.getLogger(Dom4JParserUnitTest.class); 但是有时候，我们还会遇到 Log log = LogFactory.getLog...解答 最主要的不同是使用的 API 不同，LogFactory 是 commons-logging 的 API。 这个 API 已经有多年没有更新了。...当然是可以的，只是后面的你的使用就只能用 log 了，这个可能会与 LogFactory 中定义的 log 搞混。 所以很多项目的日志，如果使用了 slf4j 的话，通常都会使用 logger。
) 那么我们打开LogFactory类来看看他的加载顺序到底是怎么实现的: import java.lang.reflect.Constructor; public final class LogFactory...::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation(LogFactory...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory...::useJdkLogging); tryImplementation(LogFactory::useNoLogging); } private LogFactory() {...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory
我们来看下 MyBatis 中 LogFactory 日志工厂的实现： /** * 日志工厂,通过getLog()方法获取日志实现类 */ public final class LogFactory...::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation(LogFactory...::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation(LogFactory...::useJdkLogging); tryImplementation(LogFactory::useNoLogging); } private LogFactory() {...Cause: " + t, t); } } ...省略非必要代码 } 可以看到，在 LogFactory 的静态代码块中，按照指定的顺序尝试加载 Log 实现类，具体的优先级为：slf4j
从上图可以看出，整个入口由工厂LogFactory来创建LogStrategy子类实例，LogStrategy是个抽象的模板类，定义了公共的处理方法，但并不知道怎样写日志（比如是写入到数据库呢还是到文件...LogFactory是一个简单工厂，封装创建LogStrategy对象的代码。...public class LogFactory { public static LogFactory Instance=new LogFactory(); private LogFactory...LogStrategy Resolve() where T:LogStrategy { return _strategies[typeof(T).Name]; } } LogFactory...根据需求使用不同的日志类 LogFactory.Instance.Resolve().Log("Welcome"); 小结 不同于服务器端的日志组件，比如Log4J，
lab.quartz.lab12; import java.util.Date; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory...RemoteJob implements Job { public static final String MESSAGE = "msg"; private static Log _log = LogFactory.getLog...lab.quartz.lab12; import java.util.Date; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory...org.quartz.impl.StdSchedulerFactory; public class RemoteClientLab{ public void run() throws Exception { Log log = LogFactory.getLog...package lab.quartz.lab12; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory
org.springframework.boot.actuate.system; import java.io.File; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory...class DiskSpaceHealthIndicator extends AbstractHealthIndicator { private static final Log logger = LogFactory.getLog...org.springframework.boot.actuate.health; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory...abstract class AbstractHealthIndicator implements HealthIndicator { private final Log logger = LogFactory.getLog
org.apache.http.impl.conn.tsccm.RouteSpecificPool: can't find referenced class org.apache.commons.logging.LogFactory...org.apache.http.impl.conn.tsccm.RouteSpecificPool: can't find referenced class org.apache.commons.logging.LogFactory...org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager: can't find referenced class org.apache.commons.logging.LogFactory...org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager: can't find referenced class org.apache.commons.logging.LogFactory
void error(String s); void debug(String s); void trace(String s); void warn(String s); } 2 LogFactory... LogFactory工厂类负责创建日志组件适配器， ? ...在LogFactory类加载时会执行其静态代码块，其逻辑是按序加载并实例化对应日志组件的适配器，然后使用LogFactory.logConstructor这个静态字段，记录当前使用的第三方日志组件的适配器...= null) { this.logImpl = logImpl; // 记录日志的类型 // 设置 适配选择 LogFactory.useCustomLogging...Cause: " + t, t); } } 这就关联上了我们前面在LogFactory中看到的代码，启动测试方法看到的日志也和源码中的对应上来了，还有就是我们自己设置的会覆盖掉默认的sl4j
WARN cn.devmar: TRACE import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory...; public class SampleClass{ private static final Log log = LogFactory.getLog(TvSeriesController.class
/** * @author Clinton Begin * @author Eduardo Macarron */ public final class LogFactory { /**...::useSlf4jLogging); tryImplementation(LogFactory::useCommonsLogging); tryImplementation...(LogFactory::useLog4J2Logging); tryImplementation(LogFactory::useLog4JLogging); tryImplementation...(LogFactory::useJdkLogging); tryImplementation(LogFactory::useNoLogging); } private...LogFactory() { // disable construction } public static Log getLog(Class<?
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