String prjPath = System.getProperty("user.dir");

JAR包读取文件系统外部配置文件：

我们工作中，有时候，项目上线，外部系统对接系统，经常用调佣JAR包的方法。银行就经常这么干。

package test;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;

import org.apache.log4j.Logger;

/**
 * 
 * 
 * @author ZengWenfeng
 * @date 2021.03.15
 */
public class Test
{
	public static Logger logger = Logger.getLogger(Test.class);

	public static void main(String[] args)
	{
		Properties prop = new Properties();
		InputStream is;
		
		try
		{
			String prjPath = System.getProperty("user.dir");
			System.out.println(prjPath);
			logger.info("prjPath : " + prjPath);
			prjPath = prjPath.replace("\\", "/");
			logger.info("prjPath : " + prjPath);
			
			is = new FileInputStream(prjPath + "/res/config.properties");
			prop.load(is);
			
			String name = prop.get("name") == null ? "" : prop.get("name").toString();
			logger.info("name : " + name);
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		
		logger.info("test elk logger.....zengwenfeng....info");
		logger.warn("test elk logger.....zengwenfeng....warn");
	}
}

PrjTestLog

-src

-test

-test.java

-res

-config.properties

config.properties

name=zengwenfeng

Microsoft Windows [版本 6.1.7601]
版权所有 (c) 2009 Microsoft Corporation。保留所有权利。

C:\Users\zwf>E:

E:\>cd e:/1

e:\1>java -jar PrjTestlog.jar
e:\1
java.lang.NullPointerException
        at test.Main.main(Main.java:28)
-INFO-2021/03/15 16:10:20,072-test.Main.main(Main.java:45)-45-test elk logger.....zengwenfeng....info
-WARN-2021/03/15 16:10:20,075-test.Main.main(Main.java:46)-46-test elk logger.....zengwenfeng....warn

e:\1>java -jar PrjTestlog.jar
e:\1
-INFO-2021/03/15 16:12:32,641-test.Main.main(Main.java:27)-27-prjPath : e:\1
java.lang.NullPointerException
        at test.Main.main(Main.java:29)
-INFO-2021/03/15 16:12:32,646-test.Main.main(Main.java:47)-47-test elk logger.....zengwenfeng....info
-WARN-2021/03/15 16:12:32,646-test.Main.main(Main.java:48)-48-test elk logger.....zengwenfeng....warn

e:\1>java -jar PrjTestlog.jar
e:\1
-INFO-2021/03/15 16:16:41,351-test.Main.main(Main.java:27)-27-prjPath : e:\1
-INFO-2021/03/15 16:16:41,356-test.Main.main(Main.java:29)-29-prjPath : e:/1
java.lang.NullPointerException
        at test.Main.main(Main.java:31)
-INFO-2021/03/15 16:16:41,358-test.Main.main(Main.java:49)-49-test elk logger.....zengwenfeng....info
-WARN-2021/03/15 16:16:41,360-test.Main.main(Main.java:50)-50-test elk logger.....zengwenfeng....warn

e:\1>java -jar PrjTestlog.jar
e:\1
-INFO-2021/03/15 16:17:40,907-test.Main.main(Main.java:27)-27-prjPath : e:\1
-INFO-2021/03/15 16:17:40,913-test.Main.main(Main.java:29)-29-prjPath : e:/1
ile:/E:/1/PrjTestlog.jar!/test/
-INFO-2021/03/15 16:17:40,915-test.Main.main(Main.java:33)-33-path : ile:/E:/1/PrjTestlog.jar!/test/
-INFO-2021/03/15 16:17:40,917-test.Main.main(Main.java:42)-42-name : zengwenfeng
-INFO-2021/03/15 16:17:40,918-test.Main.main(Main.java:49)-49-test elk logger.....zengwenfeng....info
-WARN-2021/03/15 16:17:40,920-test.Main.main(Main.java:50)-50-test elk logger.....zengwenfeng....warn

e:\1>java -jar PrjTestlog.jar
e:\1
-INFO-2021/03/15 16:19:12,259-test.Main.main(Main.java:27)-27-prjPath : e:\1
-INFO-2021/03/15 16:19:12,266-test.Main.main(Main.java:29)-29-prjPath : e:/1
file:/E:/1/PrjTestlog.jar!/test/
-INFO-2021/03/15 16:19:12,268-test.Main.main(Main.java:33)-33-path : file:/E:/1/PrjTestlog.jar!/test/
-INFO-2021/03/15 16:19:12,270-test.Main.main(Main.java:42)-42-name : zengwenfeng
-INFO-2021/03/15 16:19:12,272-test.Main.main(Main.java:49)-49-test elk logger.....zengwenfeng....info
-WARN-2021/03/15 16:19:12,273-test.Main.main(Main.java:50)-50-test elk logger.....zengwenfeng....warn

e:\1>java -jar PrjTestlog.jar
e:\1
-INFO-2021/03/15 16:30:25,722-test.Main.main(Main.java:27)-27-prjPath : e:\1
-INFO-2021/03/15 16:30:25,722-test.Main.main(Main.java:29)-29-prjPath : e:/1
file:/E:/1/PrjTestlog.jar!/test/
-INFO-2021/03/15 16:30:25,722-test.Main.main(Main.java:33)-33-path : file:/E:/1/PrjTestlog.jar!/test/
-INFO-2021/03/15 16:30:25,722-test.Main.main(Main.java:42)-42-name : zengwenfeng
-INFO-2021/03/15 16:30:25,722-test.Main.main(Main.java:49)-49-test elk logger.....zengwenfeng....info
-WARN-2021/03/15 16:30:25,738-test.Main.main(Main.java:50)-50-test elk logger.....zengwenfeng....warn

e:\1>

java jar read filesystem config

String prjPath = System.getProperty("user.dir");

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