Read and Write Binary Files
The Files class offers a couple of convenience methods
to read and write binary content from/to files.
Since Java 11
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.HexFormat;
public class ReadWriteBinaryFiles {
static final HexFormat HEX = HexFormat.of();
static final byte[] TEST_CONTENT = HEX.parseHex("cafebabe");
public static void main(String... args) throws IOException {
var file = Files.createTempFile("ReadWriteBinaryFiles", ".txt");
// Write out a raw byte array to a file
Files.write(file, TEST_CONTENT);
// Read the entire content as one byte array:
var content = Files.readAllBytes(file);
System.out.println(HEX.formatHex(content));
// Append binary content with an OutputStream:
try (OutputStream out = Files.newOutputStream(file, StandardOpenOption.APPEND)) {
out.write(TEST_CONTENT);
}
// Read binary content from an InputStream:
try (InputStream in = Files.newInputStream(file)) {
content = in.readAllBytes();
System.out.println(HEX.formatHex(content));
}
Files.delete(file);
}
}
This snippet at GitHub
