Merge pull request #5637 from kcacademic/character-encoding

BAEL-2300: Adding files for the tutorial on character encoding.

core-java/src/main/java/com/baeldung/encoding/CharacterEncodingExamples.java

@@ -0,0 +1,32 @@
+package com.baeldung.encoding;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.UnsupportedEncodingException;
+
+public class CharacterEncodingExamples {
+
+    static String readFile(String filePath, String encoding) throws IOException {
+        File file = new File(filePath);
+        StringBuffer buffer = new StringBuffer();
+        try (InputStreamReader isr = new InputStreamReader(new FileInputStream(file), encoding)) {
+            int data;
+            while ((data = isr.read()) != -1) {
+                buffer.append((char) data);
+            }
+        }
+        return buffer.toString();
+    }
+
+    static String convertToBinary(String input, String encoding) throws UnsupportedEncodingException {
+        byte[] bytes = input.getBytes(encoding);
+        StringBuffer buffer = new StringBuffer();
+        for (int b : bytes) {
+            buffer.append(Integer.toBinaryString((b + 256) % 256));
+            buffer.append(" ");
+        }
+        return buffer.toString();
+    }
+}

core-java/src/test/java/com/baeldung/encoding/CharacterEncodingExamplesUnitTest.java

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+package com.baeldung.encoding;
+
+import java.io.IOException;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class CharacterEncodingExamplesUnitTest {
+
+    @Test
+    public void givenTextFile_whenCalledWithEncodingASCII_thenProduceIncorrectResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.readFile(
+            "src/test/resources/encoding.txt", "US-ASCII"), 
+            "The fa<66><61>ade pattern is a software-design pattern commonly used with object-oriented programming.");
+    }
+
+    @Test
+    public void givenTextFile_whenCalledWithEncodingUTF8_thenProduceCorrectResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.readFile(
+            "src/test/resources/encoding.txt", "UTF-8"), 
+            "The façade pattern is a software-design pattern commonly used with object-oriented programming.");
+    }
+
+    @Test
+    public void givenCharacterA_whenConvertedtoBinaryWithEncodingASCII_thenProduceResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.convertToBinary("A", "US-ASCII"), 
+          "1000001 ");
+    }
+
+    @Test
+    public void givenCharacterA_whenConvertedtoBinaryWithEncodingUTF8_thenProduceResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.convertToBinary("A", "UTF-8"), 
+          "1000001 ");
+    }
+
+    @Test
+    public void givenCharacterCh_whenConvertedtoBinaryWithEncodingBig5_thenProduceResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.convertToBinary("語", "Big5"), 
+          "10111011 1111001 ");
+    }
+
+    @Test
+    public void givenCharacterCh_whenConvertedtoBinaryWithEncodingUTF8_thenProduceResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.convertToBinary("語", "UTF-8"), 
+          "11101000 10101010 10011110 ");
+    }
+
+    @Test
+    public void givenCharacterCh_whenConvertedtoBinaryWithEncodingUTF32_thenProduceResult() throws IOException {
+        Assert.assertEquals(
+          CharacterEncodingExamples.convertToBinary("語", "UTF-32"), 
+          "0 0 10001010 10011110 ");
+    }
+
+}

core-java/src/test/resources/encoding.txt

@@ -0,0 +1 @@
+The façade pattern is a software-design pattern commonly used with object-oriented programming.