How does java generate a .tar file from a picture?
.tar is a suffix of a compression format. You can also use java to compress files. into tar format, below we define a tarCompression(String[] filesPathArray, String resultFilePath) method to implement this function.
(Related video tutorial sharing: java video tutorial)
1. Implement tarCompression(String[] filesPathArray, String resultFilePath)
/* tar打包压缩 * @param filesPathArray 要压缩的文件的全路径(数组) * @param resultFilePath 压缩后的文件全文件名(.tar) * @throws Exception */ public static boolean tarCompression(String[] filesPathArray, String resultFilePath) throws Exception { System.out.println(" tarCompression -> Compression start!"); FileOutputStream fos = null; TarArchiveOutputStream taos = null; try { fos = new FileOutputStream(new File(resultFilePath)); taos = new TarArchiveOutputStream(fos); for (String filePath : filesPathArray) { BufferedInputStream bis = null; FileInputStream fis = null; try { File file = new File(filePath); TarArchiveEntry tae = new TarArchiveEntry(file); // 此处指明 每一个被压缩文件的名字,以便于解压时TarArchiveEntry的getName()方法获取到的直接就是这里指定的文件名 // 以(左边的)GBK编码将file.getName()“打碎”为序列,再“组装”序列为(右边的)GBK编码的字符串 tae.setName(new String(file.getName().getBytes("GBK"), "GBK")); taos.putArchiveEntry(tae); fis = new FileInputStream(file); bis = new BufferedInputStream(fis); int count; byte data[] = new byte[1024]; while ((count = bis.read(data, 0, 1024)) != -1) { taos.write(data, 0, count); } } finally { taos.closeArchiveEntry(); if (bis != null) bis.close(); if (fis != null) fis.close(); } } } finally { if (taos != null) taos.close(); if (fos != null) fos.close(); } System.out.println(" tarCompression -> Compression end!"); return true; }
2. Use the defined tarCompression method to compress the image to generate a .tar file.
public static void main(String[] args) { tarCompression(new String["a.png", "b.png"], "e:\test.tar") }
PHP Chinese website, a large number of free programming learning courses, welcome to learn.
The above is the detailed content of How to generate a .tar file from an image in java. For more information, please follow other related articles on the PHP Chinese website!

Bytecodeachievesplatformindependencebybeingexecutedbyavirtualmachine(VM),allowingcodetorunonanyplatformwiththeappropriateVM.Forexample,JavabytecodecanrunonanydevicewithaJVM,enabling"writeonce,runanywhere"functionality.Whilebytecodeoffersenh

Java cannot achieve 100% platform independence, but its platform independence is implemented through JVM and bytecode to ensure that the code runs on different platforms. Specific implementations include: 1. Compilation into bytecode; 2. Interpretation and execution of JVM; 3. Consistency of the standard library. However, JVM implementation differences, operating system and hardware differences, and compatibility of third-party libraries may affect its platform independence.

Java realizes platform independence through "write once, run everywhere" and improves code maintainability: 1. High code reuse and reduces duplicate development; 2. Low maintenance cost, only one modification is required; 3. High team collaboration efficiency is high, convenient for knowledge sharing.

The main challenges facing creating a JVM on a new platform include hardware compatibility, operating system compatibility, and performance optimization. 1. Hardware compatibility: It is necessary to ensure that the JVM can correctly use the processor instruction set of the new platform, such as RISC-V. 2. Operating system compatibility: The JVM needs to correctly call the system API of the new platform, such as Linux. 3. Performance optimization: Performance testing and tuning are required, and the garbage collection strategy is adjusted to adapt to the memory characteristics of the new platform.

JavaFXeffectivelyaddressesplatforminconsistenciesinGUIdevelopmentbyusingaplatform-agnosticscenegraphandCSSstyling.1)Itabstractsplatformspecificsthroughascenegraph,ensuringconsistentrenderingacrossWindows,macOS,andLinux.2)CSSstylingallowsforfine-tunin

JVM works by converting Java code into machine code and managing resources. 1) Class loading: Load the .class file into memory. 2) Runtime data area: manage memory area. 3) Execution engine: interpret or compile execution bytecode. 4) Local method interface: interact with the operating system through JNI.

JVM enables Java to run across platforms. 1) JVM loads, validates and executes bytecode. 2) JVM's work includes class loading, bytecode verification, interpretation execution and memory management. 3) JVM supports advanced features such as dynamic class loading and reflection.

Java applications can run on different operating systems through the following steps: 1) Use File or Paths class to process file paths; 2) Set and obtain environment variables through System.getenv(); 3) Use Maven or Gradle to manage dependencies and test. Java's cross-platform capabilities rely on the JVM's abstraction layer, but still require manual handling of certain operating system-specific features.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SublimeText3 English version
Recommended: Win version, supports code prompts!

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
