java Logger 定义方式

Question

定义Logger有两种方式, 如下:

第一种:

private static final Logger logger = LoggerFactory.getLogger(XX.class);

第二种:

protected final Logger logger = LoggerFactory.getLogger(getClass());

这两种方式哪种更好? 我个人更倾向于第二种. 求教高手.

Answer 1

都各有利弊，静态的省内存、cpu，实例化的可以结合IOC操作来注入，查了下资料，你可以看看
http://www.slf4j.org/faq.html...
http://wiki.apache.org/common...

Answer 2

一般都是第一种吧，能private就尽量private，static final作为一个常量。

Answer 3

看你的需要 如果有些别的类需要和设置了logger的类打印在同一个日志下 那么你甚至可以设置成public的 只要知道一个logger最终可以分解成一个日志文件 就可以知道怎么设置限制范围了

Answer 4

一般用第一种，用了第二种定义的话，如果你的类里面有静态方法，那在这个静态方法里面那就用不了这个logger对象了，至于访问修饰符，能private的话还是尽量private吧，除非你有特殊需求

Answer 5

我一般写的第一种，所以也推荐啦。XX.class 应该比getClass()性能好。

Answer 6

使用lombok

@Slf4j
public class Test {

}

take it easy

Answer 7

感谢 @netBuffer @FullStackDeveloper 的帮助和提供的官方资料,让我找到了答案:http://www.slf4j.org/faq.html...

Summary
In summary, declaring logger members as static variables requires less CPU time and have a slightly smaller memory footprint. On the other hand, declaring logger members as instance variables requires more CPU time and have a slightly higher memory overhead. However, instance variables make it possible to create a distinct logger environment for each application, even for loggers declared in shared libraries. Perhaps more important than previously mentioned considerations, instance variables are IOC-friendly whereas static variables are not.

我的解决方案如下:
1.declaring logger members as static variables
2.采用@FullStackDeveloper 分享的lombok,@Slf4j take it easy.

3ks!