Embed Directive in Java

Here’s the translation of the Go code to Java, with explanations in Markdown format suitable for Hugo:

Java doesn’t have a direct equivalent to the embed directive, but we can achieve similar functionality using resource loading. Here’s how we can replicate the behavior:

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

public class ResourceEmbedding {

    // Load the contents of a file as a String
    private static String loadFileAsString(String fileName) throws IOException {
        try (InputStream is = ResourceEmbedding.class.getResourceAsStream(fileName)) {
            if (is == null) {
                throw new IOException("Resource not found: " + fileName);
            }
            return new String(is.readAllBytes(), StandardCharsets.UTF_8);
        }
    }

    // Load the contents of a file as a byte array
    private static byte[] loadFileAsByteArray(String fileName) throws IOException {
        try (InputStream is = ResourceEmbedding.class.getResourceAsStream(fileName)) {
            if (is == null) {
                throw new IOException("Resource not found: " + fileName);
            }
            return is.readAllBytes();
        }
    }

    public static void main(String[] args) {
        try {
            // Load the contents of 'single_file.txt' as a String
            String fileString = loadFileAsString("/folder/single_file.txt");
            System.out.print(fileString);

            // Load the contents of 'single_file.txt' as a byte array
            byte[] fileByte = loadFileAsByteArray("/folder/single_file.txt");
            System.out.print(new String(fileByte, StandardCharsets.UTF_8));

            // Load contents of multiple files
            String content1 = loadFileAsString("/folder/file1.hash");
            System.out.print(content1);

            String content2 = loadFileAsString("/folder/file2.hash");
            System.out.print(content2);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In this Java implementation:

We use the getResourceAsStream method to load resources from the classpath. This is similar to embedding files in the binary, as the resources are packaged with the application.
The loadFileAsString method loads a file’s contents as a String, similar to the fileString variable in the original code.
The loadFileAsByteArray method loads a file’s contents as a byte[], similar to the fileByte variable in the original code.
In the main method, we load and print the contents of various files, mirroring the functionality of the original code.

To use this code:

Create a folder directory in your project’s resources directory (typically src/main/resources in a Maven or Gradle project).
Add the following files to the folder directory:
- single_file.txt with content “hello java”
- file1.hash with content “123”
- file2.hash with content “456”
Compile and run the Java program:

$ javac ResourceEmbedding.java
$ java ResourceEmbedding
hello java
hello java
123
456

This approach provides similar functionality to the embed directive, allowing you to include resource files in your Java application and access them at runtime.

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Embed Directive in Java