如何使用Java 8在Docker容器内导入CSV？ [英] How to import a CSV inside a Docker container with Java 8?

问题描述

我希望在启动时将CSV文件中的数据加载到我的程序中。在我的本地计算机上，它工作正常，但是当我尝试对spring boot应用程序进行Dockerize时，找不到我的CSV文件。

I want load data from a CSV file into my program on startup. On my local machine it works just fine, but when I try to Dockerize the spring boot application, my CSV file cannot be found.

private final static String GIFTS_CSV = "gifts.csv";
public final static String PATH = "src/main/resources/static/";

public static Map<Integer, Gift> getGifts() throws IOException {
    String line;
    HashMap<Integer, Gift> gifts = new HashMap<>();

    BufferedReader br = new BufferedReader(new FileReader(PATH + GIFTS_CSV));
    br.readLine();
    while ((line = br.readLine()) != null) {
        String[] giftStr = line.split(CVS_SPLIT_BY);
        Gift gift = new Gift(Integer.parseInt(giftStr[0]), 
                         new Point(Double.parseDouble(giftStr[1]),
                Double.parseDouble(giftStr[2])), Double.parseDouble(giftStr[3]));
        gifts.put(gift.getId(), gift);
    }
    return gifts;
}

在两种环境中都可以获取此数据吗？还是Docker映像上的路径是什么？

Is there a way to get this data in both environments? Or what would be the path on the docker image?

推荐答案

Docker的全部目的是将执行过程与任何依赖项隔离开在执行环境上。为了使这样的过程对文件之类的数据起作用，您需要将其包含在容器中。

The entire point of Docker is to isolate the executing process from any dependencies on the execution environment. In order for such a process to act upon data like files you need to include these within the container.

一种方法是构建一个包含CSV文件的容器（使用Dockerfile），但使用docker卷会更自然。我建议您阅读以下文档：

One method is build a container that includes the CSV file (using the Dockerfile), but it would be more natural to use a docker volume. I suggest you read the following documentation:

https://docs.docker.com/engine/userguide/dockervolumes/

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