BAEL-2313 Convert String to Byte Array and Reverse in Java
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chandra
parent
d578e45a8f
commit
be17633174
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package com.baeldung.string.conversion;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import java.io.UnsupportedEncodingException;
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import java.nio.ByteBuffer;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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import java.nio.charset.CodingErrorAction;
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import java.nio.charset.StandardCharsets;
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import org.junit.Test;
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public class ByteArrayToStringUnitTest {
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@Test
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public void whenStringConstructorWithDefaultCharset_thenOK() {
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final byte[] byteArrray = { 72, 101, 108, 108, 111, 32, 87, 111, 114,
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108, 100, 33 };
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String string = new String(byteArrray);
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System.out.println(string);
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assertNotNull(string);
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}
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@Test
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public void whenStringConstructorWithNamedCharset_thenOK()
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throws UnsupportedEncodingException {
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final String charsetName = "IBM01140";
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final byte[] byteArrray = { -56, -123, -109, -109, -106, 64, -26, -106,
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-103, -109, -124, 90 };
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String string = new String(byteArrray, charsetName);
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assertEquals("Hello World!", string);
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}
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@Test
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public void whenStringConstructorWithCharSet_thenOK() {
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final Charset charset = Charset.forName("UTF-8");
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final byte[] byteArrray = { 72, 101, 108, 108, 111, 32, 87, 111, 114,
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108, 100, 33 };
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String string = new String(byteArrray, charset);
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assertEquals("Hello World!", string);
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}
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@Test
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public void whenStringConstructorWithStandardCharSet_thenOK() {
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final Charset charset = StandardCharsets.UTF_16;
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final byte[] byteArrray = { -2, -1, 0, 72, 0, 101, 0, 108, 0, 108, 0,
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111, 0, 32, 0, 87, 0, 111, 0, 114, 0, 108, 0, 100, 0, 33 };
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String string = new String(byteArrray, charset);
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assertEquals("Hello World!", string);
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}
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@Test
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public void whenDecodeWithCharset_thenOK() {
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byte[] byteArrray = { 72, 101, 108, 108, 111, 32, 87, 111, 114, 108,
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100, 33 };
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final Charset charset = StandardCharsets.UTF_8;
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String string = charset.decode(ByteBuffer.wrap(byteArrray)).toString();
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System.out.println(string);
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assertEquals("Hello World!", string);
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}
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@Test
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public void whenUsingCharsetDecoder_thenOK()
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throws CharacterCodingException {
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byte[] byteArrray = { 72, 101, 108, 108, 111, 32, 87, 111, 114, 108,
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100, 33 };
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CharsetDecoder decoder = Charset.forName("UTF-8").newDecoder();
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decoder.onMalformedInput(CodingErrorAction.IGNORE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE)
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.replaceWith("?");
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String string = decoder.decode(ByteBuffer.wrap(byteArrray)).toString();
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assertEquals("Hello World!", string);
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}
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}
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@ -0,0 +1,119 @@
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package com.baeldung.string.conversion;
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import static org.junit.jupiter.api.Assertions.assertArrayEquals;
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import static org.junit.jupiter.api.Assertions.assertNotNull;
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import java.io.UnsupportedEncodingException;
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import java.nio.CharBuffer;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CodingErrorAction;
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import java.nio.charset.StandardCharsets;
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import java.util.Arrays;
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import org.junit.Test;
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public class StringToByteArrayUnitTest {
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@Test
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public void whenGetBytesWithDefaultCharset_thenOK() {
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final String inputString = "Hello World!";
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final String defaultCharSet = Charset.defaultCharset().displayName();
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byte[] byteArrray = inputString.getBytes();
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System.out.printf(
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"Using default charset:%s, Input String:%s, Output byte array:%s\n",
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defaultCharSet, inputString, Arrays.toString(byteArrray));
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assertNotNull(byteArrray);
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assert (byteArrray.length >= inputString.length());
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}
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@Test
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public void whenGetBytesWithNamedCharset_thenOK()
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throws UnsupportedEncodingException {
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final String inputString = "Hello World!";
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final String charsetName = "IBM01140";
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byte[] byteArrray = inputString.getBytes("IBM01140");
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System.out.printf(
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"Using named charset:%s, Input String:%s, Output byte array:%s\n",
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charsetName, inputString, Arrays.toString(byteArrray));
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assertArrayEquals(new byte[] { -56, -123, -109, -109, -106, 64, -26,
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-106, -103, -109, -124, 90 },
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byteArrray);
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}
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@Test
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public void whenGetBytesWithCharset_thenOK() {
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final String inputString = "Hello World!";
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final Charset charset = Charset.forName("UTF-8");
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byte[] byteArrray = inputString.getBytes(charset);
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System.out.printf(
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"Using Charset:%s, Input String:%s, Output byte array:%s\n",
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charset, inputString, Arrays.toString(byteArrray));
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assertArrayEquals(new byte[] { 72, 101, 108, 108, 111, 32, 87, 111, 114,
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108, 100, 33 },
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byteArrray);
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}
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@Test
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public void whenGetBytesWithStandardCharset_thenOK() {
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final String inputString = "Hello World!";
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final Charset charset = StandardCharsets.UTF_16;
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byte[] byteArrray = inputString.getBytes(charset);
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System.out.printf(
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"Using Standard Charset:%s, Input String:%s, Output byte array:%s\n",
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charset, inputString, Arrays.toString(byteArrray));
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assertArrayEquals(new byte[] { -2, -1, 0, 72, 0, 101, 0, 108, 0, 108, 0,
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111, 0, 32, 0, 87, 0, 111, 0, 114, 0, 108, 0, 100, 0, 33 },
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byteArrray);
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}
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@Test
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public void whenEncodeWithCharset_thenOK() {
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final String inputString = "Hello World!";
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final Charset charset = StandardCharsets.UTF_8;
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byte[] byteArrray = charset.encode(inputString).array();
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System.out.printf(
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"Using encode with Charset:%s, Input String:%s, Output byte array:%s\n",
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charset, inputString, Arrays.toString(byteArrray));
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assertArrayEquals(new byte[] { 72, 101, 108, 108, 111, 32, 87, 111, 114,
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108, 100, 33, 0 },
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byteArrray);
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}
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@Test
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public void whenUsingCharsetEncoder_thenOK()
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throws CharacterCodingException {
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final String inputString = "Hello World!";
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CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder();
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encoder.onMalformedInput(CodingErrorAction.IGNORE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE)
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.replaceWith(new byte[] { 0 });
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byte[] byteArrray = encoder.encode(CharBuffer.wrap(inputString)).array();
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System.out.printf(
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"Using encode with CharsetEncoder:%s, Input String:%s, Output byte array:%s\n",
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encoder, inputString, Arrays.toString(byteArrray));
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assertArrayEquals(new byte[] { 72, 101, 108, 108, 111, 32, 87, 111, 114,
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108, 100, 33, 0 },
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byteArrray);
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}
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}
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