Spring Boot - Reading Text File using ResourceLoader

Question

I’m trying to read a text file using Spring resource loader like this :

Resource resource  = resourceLoader.getResource("classpath:\\static\\Sample.txt");

The file locates here in my Spring boot project:

It works fine when running the application in eclipse, but when I package the application then run it using java –jar , I get file not found exception :

java.io.FileNotFoundException: class path resource [static/Sample.txt] cannot be resolved to absolute file path because it does not reside in the
 file system: jar:file:/C:/workspace-test/XXX/target/XXX-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/static/Sample.txt

I unziped the Jar file the Sample locates in : XXX-0.0.1-SNAPSHOT\BOOT-INF\classes\static\Sample.txt

Can someone help me please ?

Thanks in advance!

Answer 1

I have checked your code.If you would like to load a file from classpath in a Spring Boot JAR, then you have to use the resource.getInputStream() rather than resource.getFile().If you try to use resource.getFile() you will receive an error, because Spring tries to access a file system path, but it can not access a path in your JAR.

detail as below:

https://smarterco.de/java-load-file-classpath-spring-boot/