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BAEL-2727 Example Code
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‎core-groovy/src/main/groovy/com/baeldung/io/Task.groovy‎

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package com.baeldung.io
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class Task implements Serializable {
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String description
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Date startDate
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Date dueDate
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int status
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}

‎core-groovy/src/main/resources/binaryExample.jpg‎

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‎core-groovy/src/main/resources/ioData.txt‎

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‎core-groovy/src/main/resources/ioInput.txt‎

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First line of text
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Second line of text
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Third line of text
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Fourth line of text

‎core-groovy/src/main/resources/ioOutput.txt‎

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Line one of output example
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Line two of output example
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Line three of output example

‎core-groovy/src/main/resources/ioSerializedObject.txt‎

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‎core-groovy/src/test/groovy/com/baeldung/io/DataAndObjectsUnitTest.groovy‎

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package com.baeldung.io
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import static org.junit.Assert.*
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import org.junit.Test
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class DataAndObjectsUnitTest {
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@Test
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void whenUsingWithDataOutputStream_thenDataIsSerializedToAFile() {
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String message = 'This is a serialized string'
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int length = message.length()
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boolean valid = true
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new File('src/main/resources/ioData.txt').withDataOutputStream { out ->
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out.writeUTF(message)
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out.writeInt(length)
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out.writeBoolean(valid)
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}
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String loadedMessage = ""
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int loadedLength
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boolean loadedValid
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new File('src/main/resources/ioData.txt').withDataInputStream { is ->
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loadedMessage = is.readUTF()
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loadedLength = is.readInt()
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loadedValid = is.readBoolean()
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}
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assertEquals(message, loadedMessage)
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assertEquals(length, loadedLength)
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assertEquals(valid, loadedValid)
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}
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@Test
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void whenUsingWithObjectOutputStream_thenObjectIsSerializedToFile() {
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Task task = new Task(description:'Take out the trash', startDate:new Date(), status:0)
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new File('src/main/resources/ioSerializedObject.txt').withObjectOutputStream { out ->
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out.writeObject(task)
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}
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Task taskRead
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new File('src/main/resources/ioSerializedObject.txt').withObjectInputStream { is ->
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taskRead = is.readObject()
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}
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assertEquals(task.description, taskRead.description)
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assertEquals(task.startDate, taskRead.startDate)
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assertEquals(task.status, taskRead.status)
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}
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}

‎core-groovy/src/test/groovy/com/baeldung/io/ReadExampleUnitTest.groovy‎

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package com.baeldung.io
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import static org.junit.Assert.*
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import org.junit.Test
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class ReadExampleUnitTest {
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@Test
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void whenUsingEachLine_thenCorrectLinesReturned() {
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def expectedList = [
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'First line of text',
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'Second line of text',
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'Third line of text',
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'Fourth line of text']
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def lines = []
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new File('src/main/resources/ioInput.txt').eachLine { line ->
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lines.add(line)
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}
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assertEquals(expectedList, lines)
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}
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@Test
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void whenUsingReadEachLineWithLineNumber_thenCorrectLinesReturned() {
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def expectedList = [
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'Second line of text',
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'Third line of text',
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'Fourth line of text']
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def lineNoRange = 2..4
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def lines = []
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new File('src/main/resources/ioInput.txt').eachLine { line, lineNo ->
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if (lineNoRange.contains(lineNo)) {
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lines.add(line)
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}
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}
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assertEquals(expectedList, lines)
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}
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@Test
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void whenUsingReadEachLineWithLineNumberStartAtZero_thenCorrectLinesReturned() {
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def expectedList = [
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'Second line of text',
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'Third line of text',
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'Fourth line of text']
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def lineNoRange = 1..3
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def lines = []
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new File('src/main/resources/ioInput.txt').eachLine(0, { line, lineNo ->
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if (lineNoRange.contains(lineNo)) {
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lines.add(line)
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}
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})
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assertEquals(expectedList, lines)
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}
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@Test
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void whenUsingWithReader_thenLineCountReturned() {
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def expectedCount = 4
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def actualCount = 0
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new File('src/main/resources/ioInput.txt').withReader { reader ->
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while(reader.readLine()) {
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actualCount++
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}
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}
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assertEquals(expectedCount, actualCount)
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}
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@Test
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void whenUsingNewReader_thenOutputFileCreated() {
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def outputPath = 'src/main/resources/ioOut.txt'
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def reader = new File('src/main/resources/ioInput.txt').newReader()
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new File(outputPath).append(reader)
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reader.close()
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def ioOut = new File(outputPath)
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assertTrue(ioOut.exists())
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ioOut.delete()
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}
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@Test
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void whenUsingWithInputStream_thenCorrectBytesAreReturned() {
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def expectedLength = 1139
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byte[] data = []
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new File("src/main/resources/binaryExample.jpg").withInputStream { stream ->
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data = stream.getBytes()
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}
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assertEquals(expectedLength, data.length)
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}
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@Test
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void whenUsingNewInputStream_thenOutputFileCreated() {
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def outputPath = 'src/main/resources/binaryOut.jpg'
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def is = new File('src/main/resources/binaryExample.jpg').newInputStream()
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new File(outputPath).append(is)
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is.close()
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def ioOut = new File(outputPath)
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assertTrue(ioOut.exists())
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ioOut.delete()
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}
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@Test
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void whenUsingCollect_thenCorrectListIsReturned() {
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def expectedList = ['First line of text', 'Second line of text', 'Third line of text', 'Fourth line of text']
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def actualList = new File('src/main/resources/ioInput.txt').collect {it}
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assertEquals(expectedList, actualList)
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}
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@Test
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void whenUsingAsStringArray_thenCorrectArrayIsReturned() {
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String[] expectedArray = ['First line of text', 'Second line of text', 'Third line of text', 'Fourth line of text']
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def actualArray = new File('src/main/resources/ioInput.txt') as String[]
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assertArrayEquals(expectedArray, actualArray)
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}
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@Test
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void whenUsingText_thenCorrectStringIsReturned() {
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def ln = System.getProperty('line.separator')
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def expectedString = "First line of text${ln}Second line of text${ln}Third line of text${ln}Fourth line of text"
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def actualString = new File('src/main/resources/ioInput.txt').text
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assertEquals(expectedString.toString(), actualString)
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}
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@Test
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void whenUsingBytes_thenByteArrayIsReturned() {
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def expectedLength = 1139
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def contents = new File('src/main/resources/binaryExample.jpg').bytes
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assertEquals(expectedLength, contents.length)
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}
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}

‎core-groovy/src/test/groovy/com/baeldung/io/TraverseFileTreeUnitTest.groovy‎

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package com.baeldung.io
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import org.junit.Test
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import groovy.io.FileType
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import groovy.io.FileVisitResult
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class TraverseFileTreeUnitTest {
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@Test
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void whenUsingEachFile_filesAreListed() {
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new File('src/main/resources').eachFile { file ->
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println file.name
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}
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}
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@Test(expected = IllegalArgumentException)
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void whenUsingEachFileOnAFile_anErrorOccurs() {
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new File('src/main/resources/ioInput.txt').eachFile { file ->
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println file.name
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}
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}
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@Test
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void whenUsingEachFileMatch_filesAreListed() {
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new File('src/main/resources').eachFileMatch(~/io.*\.txt/) { file ->
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println file.name
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}
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}
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@Test
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void whenUsingEachFileRecurse_thenFilesInSubfoldersAreListed() {
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new File('src/main').eachFileRecurse(FileType.FILES) { file ->
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println "$file.parent $file.name"
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}
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}
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@Test
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void whenUsingEachFileRecurse_thenDirsInSubfoldersAreListed() {
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new File('src/main').eachFileRecurse(FileType.DIRECTORIES) { file ->
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println "$file.parent $file.name"
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}
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}
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@Test
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void whenUsingEachDirRecurse_thenDirsAndSubDirsAreListed() {
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new File('src/main').eachDirRecurse { dir ->
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println "$dir.parent $dir.name"
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}
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}
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@Test
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void whenUsingTraverse_thenDirectoryIsTraversed() {
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new File('src/main').traverse { file ->
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if (file.directory && file.name == 'groovy') {
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FileVisitResult.SKIP_SUBTREE
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} else {
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println "$file.parent - $file.name"
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}
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}
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}
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}

‎core-groovy/src/test/groovy/com/baeldung/io/WriteExampleUnitTest.groovy‎

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package com.baeldung.io
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import static org.junit.Assert.*
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import org.junit.Before
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import org.junit.Test
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class WriteExampleUnitTest {
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@Before
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void clearOutputFile() {
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new File('src/main/resources/ioOutput.txt').text = ''
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new File('src/main/resources/ioBinaryOutput.bin').delete()
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}
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@Test
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void whenUsingWithWriter_thenFileCreated() {
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def outputLines = [
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'Line one of output example',
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'Line two of output example',
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'Line three of output example'
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]
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def outputFileName = 'src/main/resources/ioOutput.txt'
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new File(outputFileName).withWriter { writer ->
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outputLines.each { line ->
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writer.writeLine line
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}
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}
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def writtenLines = new File(outputFileName).collect {it}
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assertEquals(outputLines, writtenLines)
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}
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@Test
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void whenUsingNewWriter_thenFileCreated() {
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def outputLines = [
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'Line one of output example',
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'Line two of output example',
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'Line three of output example'
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]
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def outputFileName = 'src/main/resources/ioOutput.txt'
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def writer = new File(outputFileName).newWriter()
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outputLines.forEach {line ->
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writer.writeLine line
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}
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writer.flush()
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writer.close()
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def writtenLines = new File(outputFileName).collect {it}
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assertEquals(outputLines, writtenLines)
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}
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@Test
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void whenUsingDoubleLessThanOperator_thenFileCreated() {
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def outputLines = [
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'Line one of output example',
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'Line two of output example',
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'Line three of output example'
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]
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def ln = System.getProperty('line.separator')
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def outputFileName = 'src/main/resources/ioOutput.txt'
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new File(outputFileName) << "Line one of output example${ln}Line two of output example${ln}Line three of output example"
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def writtenLines = new File(outputFileName).collect {it}
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assertEquals(outputLines.size(), writtenLines.size())
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}
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@Test
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void whenUsingBytes_thenBinaryFileCreated() {
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def outputFileName = 'src/main/resources/ioBinaryOutput.bin'
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def outputFile = new File(outputFileName)
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byte[] outBytes = [44, 88, 22]
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outputFile.bytes = outBytes
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assertEquals(3, new File(outputFileName).size())
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}
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@Test
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void whenUsingWithOutputStream_thenBinaryFileCreated() {
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def outputFileName = 'src/main/resources/ioBinaryOutput.bin'
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byte[] outBytes = [44, 88, 22]
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new File(outputFileName).withOutputStream { stream ->
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stream.write(outBytes)
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}
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assertEquals(3, new File(outputFileName).size())
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}
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@Test
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void whenUsingNewOutputStream_thenBinaryFileCreated() {
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def outputFileName = 'src/main/resources/ioBinaryOutput.bin'
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byte[] outBytes = [44, 88, 22]
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def os = new File(outputFileName).newOutputStream()
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os.write(outBytes)
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os.close()
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assertEquals(3, new File(outputFileName).size())
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}
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}

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