Spring Boot-添加外部属性文件 [英] Spring Boot - add external property files

问题描述

我在SpringBoot中有一个简单的MVC应用程序，是使用java-config创建的（我没有web.xml）。

该应用程序具有基于JPA的数据库连接。到目前为止，一切都很好，但是现在我必须将db.properties从WAR内部移动到OS变量指定的位置（ CONFIG_LOCATION）。


在 spring doc 的描述并不太多。只能说这是可能的，但是我应该如何在Spring应用程序中设置它呢？

我想应该在初始化之前完成。


然后我只看到两个选项：

-SpringApplication-在某个地方应该从OS变量中插入文件位置，但找不到，

-一些注释，这将使OS变量不足，并在创建EntityManager之前将其添加到Spring上下文中。

I have simple MVC application in SpringBoot, created using java-config (I don't have web.xml).
That application have DB connection based on JPA. Until now, all was great, but now I must move db.properties from inside of WAR to location specified by OS variable ("CONFIG_LOCATION").

In spring doc is written about that not too much. There is only say that it is posible, but how I should set that in my Spring application?
I suppose that should be done before initializer.

Then I see only two options:
- SpringApplication - there is somewhere a place where I should insert files location from OS variable but I can't find it,
- some annotation, that will understond OS variable, and add files from it to spring context before EntityManager will be created.

我很乐意建议我该怎么做。

I'm open to suggestion how should I do that.

推荐答案

好，我找到了一种方法。

Ok, I found a way.

我创建了类，返回什么PropertySourcesPlaceholderConfigurer。

在该PSPC中，我获取OS变量，并扫描该位置中的所有文件。

扫描后，我将所有具有属性扩展名的文件添加到PSCS作为位置。 br />
方法是@Bean，类是@Configuration。之后一切正常：）

I created class what return PropertySourcesPlaceholderConfigurer.
In that PSPC i get OS variable, and scan all files in that location.
After scan I was add all files with properties extension to PSCS as locations.
Method is @Bean, and class is @Configuration. After that all works fine :)

imports...

@Configuration
public class AppServiceLoader {
    @Bean(name = "propLoader")
    public static PropertySourcesPlaceholderConfigurer properties() {
        PropertySourcesPlaceholderConfigurer pspc = new PropertySourcesPlaceholderConfigurer();

        String mainConfigPath = StringUtils.isNotEmpty(System.getenv("CONFIG_LOCATION"))
                ? System.getenv("CONFIG_LOCATION") : System.getProperties().getProperty("CONFIG_LOCATION");

        File configFolder = new File(mainConfigPath);

        if(configFolder.isDirectory()) {
            FilenameFilter ff = new FilenameFilter() {

                @Override
                public boolean accept(File file, String string) {
                    return string.endsWith(".properties");
                }
            };
            File[] listFiles = configFolder.listFiles(ff);
            Resource[] resources = new Resource[listFiles.length];
            for (int i = 0; i < listFiles.length; i++) {
                if(listFiles[i].isFile()) {
                    resources[i] = new FileSystemResource(listFiles[i]);
                }
            }
            pspc.setLocations(resources);
        }

        pspc.setIgnoreUnresolvablePlaceholders(true);
        return pspc;

    }
}

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