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mikr
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Java-112 Merge duplicate Java read from file articles
1 parent 3eecf54 commit 177dab4

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Lines changed: 118 additions & 142 deletions

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‎core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/FileOperationsManualTest.java‎

Lines changed: 0 additions & 134 deletions
This file was deleted.

‎core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/JavaReadFromFileUnitTest.java‎

Lines changed: 117 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,26 +1,31 @@
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package com.baeldung.readfile;
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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.hamcrest.CoreMatchers;
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import org.hamcrest.Matchers;
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import org.junit.Test;
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import org.junit.Ignore;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.*;
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import java.net.URISyntaxException;
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import java.net.URL;
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import java.net.URLConnection;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.charset.Charset;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Scanner;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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public class JavaReadFromFileUnitTest {
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private static final Logger LOG = LoggerFactory.getLogger(JavaReadFromFileUnitTest.class);
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@Test
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public void whenReadWithBufferedReader_thenCorrect() throws IOException {
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final String expected_value = "Hello world";
@@ -32,6 +37,100 @@ public void whenReadWithBufferedReader_thenCorrect() throws IOException {
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assertEquals(expected_value, currentLine);
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}
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@Test
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public void givenFileName_whenUsingClassloader_thenFileData() throws IOException {
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String expectedData = "Hello World from fileTest.txt!!!";
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ClassLoader classLoader = getClass().getClassLoader();
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File file = new File(classLoader.getResource("fileTest.txt").getFile());
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InputStream inputStream = new FileInputStream(file);
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String data = readFromInputStream(inputStream);
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assertEquals(expectedData, data.trim());
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}
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@Test
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public void givenFileNameAsAbsolutePath_whenUsingClasspath_thenFileData() throws IOException {
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String expectedData = "Hello World from fileTest.txt!!!";
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Class clazz = JavaReadFromFileUnitTest.class;
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InputStream inputStream = clazz.getResourceAsStream("/fileTest.txt");
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String data = readFromInputStream(inputStream);
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assertEquals(expectedData, data.trim());
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}
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@Test
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public void givenFileName_whenUsingJarFile_thenFileData() throws IOException {
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String expectedData = "BSD License";
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Class clazz = Matchers.class;
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InputStream inputStream = clazz.getResourceAsStream("/LICENSE.txt");
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String data = readFromInputStream(inputStream);
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assertThat(data.trim(), CoreMatchers.containsString(expectedData));
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}
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@Test
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public void givenURLName_whenUsingURL_thenFileData() throws IOException {
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String expectedData = "Example Domain";
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URL urlObject = new URL("http://www.example.com/");
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URLConnection urlConnection = urlObject.openConnection();
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InputStream inputStream = urlConnection.getInputStream();
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String data = readFromInputStream(inputStream);
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assertThat(data.trim(), CoreMatchers.containsString(expectedData));
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}
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@Test
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public void givenFileName_whenUsingFileUtils_thenFileData() throws IOException {
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String expectedData = "Hello World from fileTest.txt!!!";
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ClassLoader classLoader = getClass().getClassLoader();
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File file = new File(classLoader.getResource("fileTest.txt").getFile());
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String data = FileUtils.readFileToString(file, "UTF-8");
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assertEquals(expectedData, data.trim());
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}
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@Test
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public void givenFilePath_whenUsingFilesReadAllBytes_thenFileData() throws IOException, URISyntaxException {
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String expectedData = "Hello World from fileTest.txt!!!";
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Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
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byte[] fileBytes = Files.readAllBytes(path);
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String data = new String(fileBytes);
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assertEquals(expectedData, data.trim());
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}
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@Test
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public void givenFilePath_whenUsingFilesLines_thenFileData() throws IOException, URISyntaxException {
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String expectedData = "Hello World from fileTest.txt!!!";
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Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
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Stream<String> lines = Files.lines(path);
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String data = lines.collect(Collectors.joining("\n"));
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lines.close();
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assertEquals(expectedData, data.trim());
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}
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@Test
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public void givenFileName_whenUsingIOUtils_thenFileData() throws IOException {
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String expectedData = "This is a content of the file";
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FileInputStream fis = new FileInputStream("src/test/resources/test_read9.in");
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String data = IOUtils.toString(fis, "UTF-8");
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assertEquals(expectedData, data.trim());
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}
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@Test
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public void whenReadWithScanner_thenCorrect() throws IOException {
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final Scanner scanner = new Scanner(new File("src/test/resources/test_read1.in"));
@@ -106,14 +205,12 @@ public void whenReadTwoFilesWithSequenceInputStream_thenCorrect() throws IOExcep
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}
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@Test
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@Ignore // TODO
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public void whenReadUTFEncodedFile_thenCorrect() throws IOException {
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final String expected_value = "青空";
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final BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("src/test/resources/test_read7.in"), "UTF-8"));
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final String currentLine = reader.readLine();
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reader.close();
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LOG.debug(currentLine);
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assertEquals(expected_value, currentLine);
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}
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@@ -171,4 +268,16 @@ public void whenReadLargeFileJava7_thenCorrect() throws IOException {
171268
assertEquals(expected_value, line);
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}
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private String readFromInputStream(InputStream inputStream) throws IOException {
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StringBuilder resultStringBuilder = new StringBuilder();
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try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) {
274+
String line;
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while ((line = bufferedReader.readLine()) != null) {
276+
resultStringBuilder.append(line).append("\n");
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}
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}
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return resultStringBuilder.toString();
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}
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}

‎core-java-modules/core-java-io/src/test/resources/test_read9.in‎

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