在Spring Boot JAR中包含一个外部文件

Question

I created a spring boot application which reads an excel file for data to be displayed in the front end so basically its the source of persistent data. I am able to run to correctly from my eclipse but when i create a spring boot jar and run it from the command line it fails as the files are not included in the jar.

I have tried two location src/main/resources and /src/main/webapp/WEB-INF/external/ but in both cases the files are not included.

Code :

private static final String FILE1 = "\\src\\main\\webapp\\WEB-INF\\external\\file1.csv";
private static final String FILE2 = "\\src\\main\\webapp\\WEB-INF\\external\\file2.csv";
private static String currentDirectory = Paths.get(".").toAbsolutePath().toString();
private static String completeAbsolutePath = currentDirectory
                      .substring(0, currentDir.length() - 1)
                      .replace("\\", "\\\\");

reader = new CSVReader(new FileReader(completePath + FILE1))

Error :

java.io.FileNotFoundException: c:\\delete\\src\\main\\webapp\\WEB-INF\\external\\File1.csv

Can someone one please help?

Answer 1

You have two problems here:

1. You put the resources under src folder instead of creating a designated resources folder and put it there. To do that you should create a folder called "resources" at the same level as "src" right click the folder, select "Mark Directory As -> Resources Root"

2. You are referring to the file with a relative path. This may work in eclipse but when you run it as a jar that paths are changed and relative path is not correct anymore.

   To use such a resource you should use the ClassLoader API ClassLoader.getResourceAsStream(String name) to get your resource.

   It should look similar to the following:

    reader = new CSVReader(new InputstreamReader(ClassLoader.getResourceAsStream(completePath + 

   FILE1)));