BAEL-2059
* New section in InputStream to byte array article and recreating branch. * Minor typo * Code reformat using intellij formatter. * Code reformat using intellij formatter. * guava implementation to be completed * guava implementation * Added assert to guava test * Fix formatting
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package org.baeldung.java.io;
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import com.google.common.io.ByteStreams;
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import org.apache.commons.io.IOUtils;
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import org.junit.jupiter.api.Test;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.ReadableByteChannel;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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class InputStreamToByteBufferUnitTest {
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@Test
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public void givenUsingCoreClasses_whenWritingAFileIntoAByteBuffer_thenBytesLengthMustMatch() throws IOException {
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File inputFile = getFile();
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ByteBuffer bufferByte = ByteBuffer.allocate((int) inputFile.length());
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FileInputStream in = new FileInputStream(inputFile);
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in.getChannel().read(bufferByte);
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assertEquals(bufferByte.position(), inputFile.length());
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}
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@Test
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public void givenUsingCommonsIo_whenWritingAFileIntoAByteBuffer_thenBytesLengthMustMatch() throws IOException {
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File inputFile = getFile();
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ByteBuffer bufferByte = ByteBuffer.allocateDirect((int) inputFile.length());
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ReadableByteChannel readableByteChannel = new FileInputStream(inputFile).getChannel();
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IOUtils.readFully(readableByteChannel, bufferByte);
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assertEquals(bufferByte.position(), inputFile.length());
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}
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@Test
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public void givenUsingGuava_whenWritingAFileIntoAByteBuffer_thenBytesLengthMustMatch() throws IOException {
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File inputFile = getFile();
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FileInputStream in = new FileInputStream(inputFile);
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byte[] targetArray = ByteStreams.toByteArray(in);
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ByteBuffer bufferByte = ByteBuffer.wrap(targetArray);
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bufferByte.rewind();
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while (bufferByte.hasRemaining()) {
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bufferByte.get();
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}
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assertEquals(bufferByte.position(), inputFile.length());
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}
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private File getFile() {
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ClassLoader classLoader = new InputStreamToByteBufferUnitTest().getClass().getClassLoader();
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String fileName = "frontenac-2257154_960_720.jpg";
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return new File(classLoader.getResource(fileName).getFile());
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}
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}
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</dependencies>
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<properties>
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<guava.version>22.0</guava.version>
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<guava.version>23.0</guava.version>
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</properties>
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</project>
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</project>
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