如何获得SLF4J“Hello World”使用log4j？ [英] How to get SLF4J "Hello World" working with log4j?
问题描述
SLF4J 中的Hello World示例对我不起作用。我想这是因为我在我的类路径中添加了slf4j-log4。我应该直接配置log4j以使hello world工作吗？
The "Hello World" example from SLF4J is not working for me. I guess this is because I added slf4j-log4 to my classpath. Should I configure log4j directly for the hello world to work?
log4j:WARN No appenders could be found for logger (HelloWorld).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
更新：我添加了log4j初始化，它仍然无法正常工作：
Update: I added log4j initialization, and it still doesn't work:
public static void main(String[] params) {
org.apache.log4j.Logger.getRootLogger().addAppender(new ConsoleAppender());
Logger logger = org.slf4j.LoggerFactory.getLogger(TestBase.class);
logger.info("Hello World");
}
我收到了：
log4j:ERROR No output stream or file set for the appender named [null].
推荐答案
如果你想使用 slf4j简单，您需要在类路径中使用这些 jar 文件：
If you want to use slf4j simple, you need these jar files on your classpath:
- slf4j-api-1.6.1.jar
- slf4j-simple-1.6.1.jar
如果你想使用 slf4j 和 log4j ，你需要这些 jar 类路径上的文件：
If you want to use slf4j and log4j, you need these jar files on your classpath:
- slf4j-api-1.6.1.jar
- slf4j-log4j12-1.6.1.jar
- log4j-1.2.16.jar
不多也不少。使用 slf4j simple ，您将获得 INFO 级别或更高级别的基本日志记录。使用 log4j ，您必须相应地配置它。
No more, no less. Using slf4j simple, you'll get basic logging to your console at INFO level or higher. Using log4j, you must configure it accordingly.
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