java调用第三方包的例子

第三方包路径

D:\jp\log4j\log4j-1.2.16.jar

代码D:\jp\log4j\Log4jDemo.java

import org.apache.log4j.*;
 
public class Log4jDemo{
	//参数与所在类名一致
	private static Logger logger = Logger.getLogger(Log4jDemo.class);
 
	public static void main(String[] args) {
		//初始化，使用默认配置
		BasicConfigurator.configure();
		logger.debug("This is a test log.");
	}
 
}

编译

javac -classpath ".\*" Log4jDemo.java

执行

java -classpath ".;.\*" Log4jDemo

输出

0 [main] DEBUG Log4jDemo  - This is a test log.