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Java Convert Long To Byte Array
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‎JavaConvertLongToByteArray/.idea/compiler.xml‎

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‎JavaConvertLongToByteArray/.idea/encodings.xml‎

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‎JavaConvertLongToByteArray/.idea/kotlinc.xml‎

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‎JavaConvertLongToByteArray/.idea/misc.xml‎

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‎JavaConvertLongToByteArray/.idea/modules.xml‎

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‎JavaConvertLongToByteArray/.idea/workspace.xml‎

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‎JavaConvertLongToByteArray/JavaConvertLongToByteArray.iml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
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<output url="file://$MODULE_DIR$/target/classes" />
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<output-test url="file://$MODULE_DIR$/target/test-classes" />
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<content url="file://$MODULE_DIR$">
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<sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
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<sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/target" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>

‎JavaConvertLongToByteArray/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>JavaByteOperation</groupId>
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<artifactId>JavaByteOperation</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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</properties>
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<build>
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<finalName>JavaByteOperation</finalName>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎JavaConvertLongToByteArray/src/main/java/com/javadeveloperzone/LongByteOperationUtil.java‎

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package com.javadeveloperzone;
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import java.io.ByteArrayOutputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.math.BigDecimal;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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/**
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* Created by JavaDeveloperZone on 2/5/2018.
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*/
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public class LongByteOperationUtil {
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public static void main(String[] args) throws IOException {
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LongByteOperationUtil byteOperationUtil = new LongByteOperationUtil();
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long number = 4444444L;
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System.out.println("***************************");
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byte [] intBytes = byteOperationUtil.longToByteArray(number);
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long num = byteOperationUtil.convertByteArrayToLong(intBytes);
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System.out.println("Num is :"+num);
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intBytes = byteOperationUtil.longToByteArray(number);
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num = byteOperationUtil.convertByteArrayToLong(intBytes);
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System.out.println("Num is :"+num);
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intBytes = byteOperationUtil.convertLongArrayToByteArray(new long[]{1,2,3});
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long [] longArray = byteOperationUtil.convertByteArrayToLongArray(intBytes);
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for(long l : longArray){
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System.out.println(l);
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}
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/*for(byte b : intBytes){
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System.out.println(b);
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}*/
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}
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private byte [] convertLongToByteArray(long number) {
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ByteBuffer byteBuffer = ByteBuffer.allocate(Long.BYTES);
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byteBuffer.putLong(number);
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return byteBuffer.array();
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}
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private static byte[] longtoBytes(long data) {
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return new byte[]{
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(byte) ((data >> 56) & 0xff),
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(byte) ((data >> 48) & 0xff),
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(byte) ((data >> 40) & 0xff),
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(byte) ((data >> 32) & 0xff),
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(byte) ((data >> 24) & 0xff),
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(byte) ((data >> 16) & 0xff),
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(byte) ((data >> 8) & 0xff),
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(byte) ((data >> 0) & 0xff),
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};
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}
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private byte[] longToByteArray ( final long i ) throws IOException {
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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DataOutputStream dos = new DataOutputStream(bos);
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dos.writeLong(i);
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dos.flush();
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return bos.toByteArray();
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}
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private long convertByteArrayToLong(byte[] longBytes){
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ByteBuffer byteBuffer = ByteBuffer.allocate(Long.BYTES);
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byteBuffer.put(longBytes);
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byteBuffer.flip();
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return byteBuffer.getLong();
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}
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private byte[] convertLongArrayToByteArray(long[] data) {
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if (data == null) return null;
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// ----------
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byte[] byts = new byte[data.length * Long.BYTES];
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for (int i = 0; i < data.length; i++)
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System.arraycopy(convertLongToByteArray(data[i]), 0, byts, i * Long.BYTES, Long.BYTES);
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return byts;
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}
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public long[] convertByteArrayToLongArray(byte[] data) {
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if (data == null || data.length % Long.BYTES != 0) return null;
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// ----------
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long[] longs = new long[data.length / Long.BYTES];
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for (int i = 0; i < longs.length; i++)
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longs[i] = ( convertByteArrayToLong(new byte[] {
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data[(i*Long.BYTES)],
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data[(i*Long.BYTES)+1],
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data[(i*Long.BYTES)+2],
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data[(i*Long.BYTES)+3],
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data[(i*Long.BYTES)+4],
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data[(i*Long.BYTES)+5],
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data[(i*Long.BYTES)+6],
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data[(i*Long.BYTES)+7],
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} ));
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return longs;
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}
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public long convertByteArrayToLongArrayByShift(byte[] data) {
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if (data == null || data.length % Long.BYTES != 0) return -1;
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// ----------
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return ( convertByteArrayToLong(new byte[] {
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data[(Long.BYTES)],
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data[(Long.BYTES)+1],
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data[(Long.BYTES)+2],
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data[(Long.BYTES)+3],
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data[(Long.BYTES)+4],
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data[(Long.BYTES)+5],
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data[(Long.BYTES)+6],
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data[(Long.BYTES)+7],
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} ));
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}
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}

‎JavaConvertLongToByteArray/target/classes/com/javadeveloperzone/ByteOperationUtil.class‎

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