从命令行加载spring上下文的属性

java -jar myapp.jar --spring.config.location=classpath:/,file:/path/to/config/

export SPRING_CONFIG_LOCATION=classpath:/,file:/path/to/config/
java -jar myapp.jar

java -Dspring.config.location=classpath:/,file:/path/to/config/ -jar myapp.jar

public class MyContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        ConfigurableEnvironment environment = applicationContext.getEnvironment();
        // 设置属性值
        environment.getPropertySources().addFirst(new PropertySource<String>("commandLine") {
            @Override
            public Object getProperty(String key) {
                return System.getProperty(key);
            }
        });
    }
}

java -Dspring.config.location=classpath:/,file:/path/to/config/ -jar myapp.jar