SpringBoot-访问资源文件夹中的文件 [英] SpringBoot - accessing a file inside resources folder

问题描述

我正在从主类访问资源文件夹中的文件

I am accessing a File inside the resources folder from the main class

File file = new ClassPathResource("remoteUnitsIdsInOldServer.txt").getFile();

我收到此错误:

java.io.FileNotFoundException: class path resource [remoteUnitsIdsInOldServer.txt] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/Users/lopes/Documents/workspace-sts-3.9.0.RELEASE/telefonicaUtils/target/telefonicaUtils-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/remoteUnitsIdsInOldServer.txt

我什至打开了jar文件，并且在类内部有文件remoteUnitsIdsInOldServer.txt

and I even open the jar file and the file remoteUnitsIdsInOldServer.txt is there, inside classes

推荐答案

这取决于您的要求.

考虑到您需要从资源访问文本文件.您可以简单地使用apache IOUtils和java ClassLoader.

Considering you need to access text file from resource. You can simply use apache IOUtils and java ClassLoader.

代码段(请注意:IOUtils程序包-> org.apache.commons.io.IOUtils)

Snippet (note: IOUtils package --> org.apache.commons.io.IOUtils)

    String result = "";

    ClassLoader classLoader = getClass().getClassLoader();
    try {
        result = IOUtils.toString(classLoader.getResourceAsStream("fileName"));
    } catch (IOException e) {
        e.printStackTrace();
    }

经典方式:

StringBuilder result = new StringBuilder("");

//Get file from resources folder

ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileName").getFile());

try (Scanner scanner = new Scanner(file)) {

    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        result.append(line).append("\n");
    }

    scanner.close();

} catch (IOException e) {
    e.printStackTrace();
}

情况2:

考虑到您需要从诸如xml，属性文件之类的资源中访问属性. 它太简单了，只需使用spring注释@ImportResource({ "classpath:application-properties.xml", "classpath:context.properties" }) 希望对您有所帮助.

Case 2:

Considering you need to access properties from resources such as xml, properties files. Its too simple, Simply use spring annotation @ImportResource({ "classpath:application-properties.xml", "classpath:context.properties" }) Hope that will be helpful to you.

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