日志记录器挺简单的，没有很多东西，最主要的就是一个Logger接口：
public interface Logger { public static final int FATAL = Integer.MIN_VALUE; public static final int ERROR = 1; public static final int WARNING = 2; public static final int INFORMATION = 3; public static final int DEBUG = 4; public Container getContainer(); public void setContainer(Container container); public String getInfo(); public int getVerbosity(); public void setVerbosity(int verbosity); public void addPropertyChangeListener(PropertyChangeListener listener); public void log(String message); public void log(Exception exception, String msg); public void log(String message, Throwable throwable); public void log(String message, int verbosity); public void log(String message, Throwable throwable, int verbosity); public void removePropertyChangeListener(PropertyChangeListener listener); } public interfa
阅读背景：
Tomcat源码分析(六)--日志记录器和国际化
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