How to generate a .tar file from an image in java

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.

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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")
}

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