英文:
Read directory from Spring Boot's Fat JAR
问题
我正尝试在我的Spring Boot 2应用程序中读取resources/configs目录。以下是该目录结构的示例：
resources| configs| | file1.xml| | file2.xml| | ...
我正在读取目录和嵌套文件的代码如下：
@Value("${app.configs-path}")String configsPath;...Resource configsDirectoryResource = new ClassPathResource(configsPath);InputStream configsDirectoryStream = configsDirectoryResource.getInputStream();InputStreamReader configsDirectoryStreamReader = new InputStreamReader(configsDirectoryStream);BufferedReader configsDirectoryBufferedReader = new BufferedReader(configsDirectoryStreamReader);List<String> configFileNames = configsDirectoryBufferedReader.lines().collect(toList());
还有我的application.properties配置文件内容如下：
app.configs-path=configs
当我在IDE中运行应用程序时，这个方法运行得很好。configsDirectoryResource对象返回文件名的流，然后我逐个读取嵌套文件。但是当我运行JAR文件时，configsDirectoryResource对象不返回任何文件名。然而，我可以直接读取XML文件，但我希望能够在运行时获得文件列表。
我该如何在JAR文件中读取目录或获取目录中的文件列表呢？
英文:
I'm trying to read the resources/configs directory in my Spring Boot 2 application. Here is the example of the structure of the directory:
resources| configs| | file1.xml| | file2.xml| | ...
Code where I'm reading the directory and the nested files:
@Value("${app.configs-path}")String configsPath;...Resource configsDirectoryResource = new ClassPathResource(configsPath);InputStream configsDirectoryStream = configsDirectoryResource.getInputStream();InputStreamReader configsDirectoryStreamReader = new InputStreamReader(configsDirectoryStream);BufferedReader configsDirectoryBufferedReader = new BufferedReader(configsDirectoryStreamReader);List<String> configFileNames = configsDirectoryBufferedReader.lines().collect(toList());
And my application.properties:
app.configs-path=configs
When I run my application in IDE, this works fine. The object configsDirectoryResource returns stream of filenames, and then I read every nested file. But when I launch the JAR file, configsDirectoryResource returns no filenames. However I can read XML files directly, but I'd like to get list of files in runtime.
How can I read the directory or get list of files in the directory which is in the JAR file?
答案1
得分: 0
可以使用 Spring Framework 中的 PathMatchingResourcePatternResolver。
示例代码：
ClassLoader cl = this.getClass().getClassLoader();ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(cl);Resource[] resources = resolver.getResources("classpath*:/"+configsPath+"/*.xml");for (Resource resource: resources){logger.info(resource.getFilename());}
英文:
You can use PathMatchingResourcePatternResolver from Spring Framework.
Example code:
ClassLoader cl = this.getClass().getClassLoader();ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(cl);Resource[] resources = resolver.getResources("classpath*:/"+configsPath+"/*.xml") ;for (Resource resource: resources){logger.info(resource.getFilename());}
答案2
得分: 0
好的，那比我想象的要简单。
ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();Resource[] resources = resourcePatternResolver.getResources(configsPath + "/*.xml");
然后，我们可以从每个 resource 中获取一个 InputStream 并对它们进行操作。
英文:
OK, that was easier than I thought.
ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();Resource[] resources = resourcePatternResolver.getResources(configsPath + "/*.xml");
Then we can get an InputStream from each resource and work with them.
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