在类路径中读取文件

InputStream inputStream = getClass().getResourceAsStream("/path/to/file.txt");

URL resourceUrl = getClass().getResource("/path/to/file.txt");
InputStream inputStream = resourceUrl.openStream();

URL resourceUrl = getClass().getClassLoader().findResource("path/to/file.txt");
InputStream inputStream = resourceUrl.openStream();

try (InputStream inputStream = getClass().getResourceAsStream("/path/to/file.txt")) {
    if (inputStream == null) {
        System.err.println("File not found");
        return;
    }
    // read from inputStream
} catch (IOException e) {
    System.err.println("Error reading file: " + e.getMessage());
}