java - Spring Boot 中的配置文件位于 jar 文件之外

Question

我有一个 Spring boot Camel 应用程序，其目录结构如下

我想把这个项目转换成jar文件。但我想要在我的 jar 之外有 3 个文件，这样当配置更改时我不需要一次又一次地重新部署我的应用程序。这 3 个文件是

1. 应用程序属性

2. CamelContext.xml

3. sql.properties

   我可以灵活地对文件位置的路径进行硬编码。谁能帮助我如何实现这一目标？

Answer 1

既然我已经解决了这个问题，我就会为任何试图实现同样目标的人发布解决方案。

@SuppressWarnings("resource")
public static void main(String[] args) throws Exception {
    /*To load CamelContext.xml file */
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

    CustomResourceLoader customResourceLoader = (CustomResourceLoader) context.getBean("customResourceLoader");

    customResourceLoader.showResourceData();

/*To load the properties file*/ 

    ConfigurableApplicationContext applicationContext = new SpringApplicationBuilder(Application.class)
            .properties("spring.config.name:application.properties,sql",
                    "spring.config.location=D:/external/application.properties,D:/external/sql.properties")
            .build().run(args);

    ConfigurableEnvironment environment = applicationContext.getEnvironment();


}

在与主类相同的包中创建一个类 CustomResourceLoader.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;


public class CustomResourceLoader implements ResourceLoaderAware {

    private ResourceLoader resourceLoader;

    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
    }

    public void showResourceData() throws IOException
    {
        //This line will be changed for all versions of other examples
        Resource banner = resourceLoader.getResource("file:D:/external/CamelContext.xml");
        InputStream in = banner.getInputStream();

        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        while (true) {
            String line = reader.readLine();
            if (line == null)
                break;
            System.out.println(line);
        }
        reader.close();
    }




}

另外，在 src/main/resources 中创建一个 applicationContext.xml 文件

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
       http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://camel.apache.org/schema/spring 
       http://camel.apache.org/schema/spring/camel-spring.xsd">
<bean id="customResourceLoader" class="main.CustomResourceLoader"></bean>

</beans>

附录 -

• http://www.java2novice.com/spring-boot/load-external-configuration-files/
• https://howtodoinjava.com/spring/spring-core/how-to-load-external-resources-files-into-spring-context/