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eugenp
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java IO testing work
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2 files changed

+103
-63
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2 files changed

+103
-63
lines changed

‎core-java/src/test/java/org/baeldung/java/CoreJavaIoIntegrationTest.java‎

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package org.baeldung.java;
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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.util.Scanner;
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import org.apache.commons.io.FileUtils;
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import org.junit.Test;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.google.common.base.Charsets;
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import com.google.common.io.Files;
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public class CoreJavaIoIntegrationTest {
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protected final Logger logger = LoggerFactory.getLogger(getClass());
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// tests - iterate lines in a file
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@Test
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public final void givenUsingGuava_whenIteratingAFile_thenCorrect() throws IOException {
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final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
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// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
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logMemory();
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Files.readLines(new File(path), Charsets.UTF_8);
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logMemory();
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}
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@Test
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public final void givenUsingCommonsIo_whenIteratingAFile_thenCorrect() throws IOException {
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final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
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// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
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logMemory();
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FileUtils.readLines(new File(path));
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logMemory();
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}
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@Test
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public final void whenStreamingThroughAFile_thenCorrect() throws IOException {
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final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
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// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
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logMemory();
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FileInputStream inputStream = null;
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Scanner sc = null;
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try {
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inputStream = new FileInputStream(path);
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sc = new Scanner(inputStream, "UTF-8");
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while (sc.hasNextLine()) {
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final String line = sc.nextLine();
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// System.out.println(line);
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}
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// note that Scanner suppresses exceptions
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if (sc.ioException() != null) {
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throw sc.ioException();
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}
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} finally {
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if (inputStream != null) {
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inputStream.close();
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}
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if (sc != null) {
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sc.close();
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}
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}
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logMemory();
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}
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// utils
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private final void logMemory() {
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logger.info("Max Memory: {} Mb", Runtime.getRuntime().maxMemory() / 1048576);
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logger.info("Total Memory: {} Mb", Runtime.getRuntime().totalMemory() / 1048576);
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logger.info("Free Memory: {} Mb", Runtime.getRuntime().freeMemory() / 1048576);
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}
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}

‎core-java/src/test/java/org/baeldung/java/CoreJavaIoUnitTest.java‎

Lines changed: 22 additions & 63 deletions
Original file line numberDiff line numberDiff line change
@@ -5,83 +5,27 @@
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import static org.junit.Assert.assertThat;
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import java.io.ByteArrayInputStream;
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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.io.InputStream;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.nio.charset.StandardCharsets;
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import java.util.Scanner;
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import org.apache.commons.io.FileUtils;
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import org.apache.commons.io.IOUtils;
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import org.junit.Test;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.google.common.base.Charsets;
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import com.google.common.io.ByteSource;
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import com.google.common.io.CharStreams;
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import com.google.common.io.Files;
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import com.google.common.io.InputSupplier;
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public class CoreJavaIoUnitTest {
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protected final Logger logger = LoggerFactory.getLogger(getClass());
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// tests - iterate lines in a file
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@Test
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public final void givenUsingGuava_whenIteratingAFile_thenCorrect() throws IOException {
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final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
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// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
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logMemory();
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Files.readLines(new File(path), Charsets.UTF_8);
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logMemory();
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}
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@Test
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public final void givenUsingCommonsIo_whenIteratingAFile_thenCorrect() throws IOException {
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final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
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// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
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logMemory();
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FileUtils.readLines(new File(path));
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logMemory();
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}
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@Test
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public final void whenStreamingThroughAFile_thenCorrect() throws IOException {
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final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
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// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
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logMemory();
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FileInputStream inputStream = null;
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Scanner sc = null;
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try {
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inputStream = new FileInputStream(path);
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sc = new Scanner(inputStream, "UTF-8");
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while (sc.hasNextLine()) {
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final String line = sc.nextLine();
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// System.out.println(line);
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}
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// note that Scanner suppresses exceptions
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if (sc.ioException() != null) {
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throw sc.ioException();
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}
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} finally {
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if (inputStream != null) {
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inputStream.close();
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}
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if (sc != null) {
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sc.close();
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}
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}
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logMemory();
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}
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// tests - InputStream to String
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@Test
@@ -120,12 +64,27 @@ public final void givenUsingGuavaWithEncoding_whenConvertingAnInputStreamToAStri
12064
assertThat(text, equalTo(originalString));
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}
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// utils
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@Test
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public final void givenUsingCommonsIoWithEncoding_whenConvertingAnInputStreamToAString_thenCorrect() throws IOException {
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final String originalString = randomAlphabetic(8);
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final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
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// When
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final String text = IOUtils.toString(inputStream, StandardCharsets.UTF_8.name());
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assertThat(text, equalTo(originalString));
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}
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@Test
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public final void givenUsingCommonsIoWithEncoding2_whenConvertingAnInputStreamToAString_thenCorrect() throws IOException {
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final String originalString = randomAlphabetic(8);
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final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
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// When
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final StringWriter writer = new StringWriter();
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final String encoding = StandardCharsets.UTF_8.name();
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IOUtils.copy(inputStream, writer, encoding);
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125-
private final void logMemory() {
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logger.info("Max Memory: {} Mb", Runtime.getRuntime().maxMemory() / 1048576);
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logger.info("Total Memory: {} Mb", Runtime.getRuntime().totalMemory() / 1048576);
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logger.info("Free Memory: {} Mb", Runtime.getRuntime().freeMemory() / 1048576);
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assertThat(writer.toString(), equalTo(originalString));
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}
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}

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