java日志组件

日志系统是一个成熟Java应用所必不可少的，在开发和调试阶段，日志可以帮助我们更好更快地定位bug；在运行维护阶段，日志系统又可以帮我们记录大部分的异常信息，从而帮助我们更好的完善系统。

commons logging

Apache Commons Logging isn't really a logging framework, but a wrapper for one. As such, it requires a logging framework underneath it. It is particularly useful when developing reusable libraries which need to write to whichever underlying logging system is being used by the application. It also provides flexibility in heterogeneous environments where the logging framework is likely to change, although in most cases, once a logging framework has been chosen, there is little need to change it over the life of the project.

slf4j

The Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction for various logging frameworks (e.g. java.util.logging, logback, log4j) allowing the end user to plug in the desired logging framework at deployment time.

Java Logging API

The Java Logging API is not a logging framework, but a standard API for accessing a logging framework. Compatible frameworks can be loaded into JVM and accessed via the API. There is also a logging implementation supplied with the Sun JVM which is the default logging framework accessed by the API. Many developers confuse this implementation with the Java Logging API.

tinylog

tinylog is a minimalist logger for Java, optimized for ease of use.

log4j1.2

log4j2

logback