Java SLF4J下载引用配置使用方法

1､SLF4J引用

1) 手动引用

下载地址：https://github.com/qos-ch/slf4j/releases

2) 使用Maven配置依赖

Maven中pom.xml添加如下：

 
  org.slf4j
  slf4j-jdk14
  1.7.28

2､使用示例代码

1) 简单记录代码

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HelloWorld {
  public static void main(String[] args) {
    Logger logger = LoggerFactory.getLogger(HelloWorld.class);
    logger.info("Hello World");
  }
}

2) 典型用法代码

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Wombat {
  final Logger logger = LoggerFactory.getLogger(Wombat.class);
  Integer t;
  Integer oldT;
  public void setTemperature(Integer temperature) {
    oldT = t;        
    t = temperature;
    logger.debug("Temperature set to {}. Old temperature was {}.", t, oldT);
    if(temperature.intValue() > 50) {
      logger.info("Temperature has risen above 50 degrees.");
    }
  }
} 

3) 简洁的API

logger.atInfo().log("Hello world");

等同于：

logger.info("Hello world.");

记录debug日志：

int newT = 15;int oldT = 16;// using traditional APIlogger.debug("Temperature set to {}. Old temperature was {}.", newT, oldT);// using fluent API, add arguments one by one and then log messagelogger.atDebug().addArgument(newT).addArgument(oldT).log("Temperature set to {}. Old temperature was {}.");// using fluent API, log message with argumentslogger.atDebug().log("Temperature set to {}. Old temperature was {}.", newT, oldT);// using fluent API, add one argument and then log message providing one more argumentlogger.atDebug().addArgument(newT).log("Temperature set to {}. Old temperature was {}.", oldT);// using fluent API, add one argument with a Supplier and then log message with one more argument.// Assume the method t16() returns 16.logger.atDebug().addArgument(() -> t16()).log(msg, "Temperature set to {}. Old temperature was {}.", oldT);

等价于：

int newT = 15;int oldT = 16;// using classical APIlogger.debug("oldT={} newT={} Temperature changed.", newT, oldT);// using fluent APIlogger.atDebug().addKeyValue("oldT", oldT).addKeyValue("newT", newT).log("Temperature changed.");   

相关文档：

http://www.slf4j.org/manual.html

https://github.com/qos-ch/slf4j