springboot项目和非springboot项目启动指定外部配置文件

springboot

java -jar yourJarFile.jar --spring.config.location=file:/path/to/your/config/file/application.properties
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no springboot在加载配置文件的代码里指定

• jar同级目录的优先级比Resource下的高

	String filePath = System.getProperty("user.dir") + "/config.properties";
    HashMap<String, Object> map = new HashMap<>();
    Properties properties = new Properties();
    properties.load(Main.class.getClassLoader().getResourceAsStream("config.properties"));
    if(new File(filePath).exists()) {
        properties.load(new FileReader(filePath));
    }
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