1. Zip压缩I/O实现

主要是使用java.util.zip包中的ZipOutputStream和ZipInputStream类来实现文件的压缩和解压缩。不管是解压缩还是压缩都需要先找到文件的“目录进入点”。

2. ZipOutputStream压缩文件

public class MyZip {
    /***
     * 参数为：
     * @param zipFileName   压缩后的文件名
     * @param inputFile    需要压缩的文件
     * @throws IOException
     */
    private void zip(String zipFileName, File inputFile) throws IOException {
        ZipOutputStream zipOutputStream=new ZipOutputStream(new FileOutputStream(zipFileName));
        zip(zipOutputStream,inputFile,"");
        System.out.println("压缩中");
        zipOutputStream.close();
    }

    /***
     * 重载zip()方法
     * @param zipOutputStream   zip的输出流
     * @param inputFile      需要压缩的文件
     * @param base          文件名
     * @throws IOException
     */
    private void zip(ZipOutputStream zipOutputStream, File inputFile, String base) throws IOException {

        if(inputFile.isDirectory()){
            File[] files=inputFile.listFiles();
            if(base.length()!=0){
                zipOutputStream.putNextEntry(new ZipEntry(base+"/"));
            }
            for(int i=0;i<files.length;i++){
                zip(zipOutputStream,files[i],base+files[i]);
            }
        }else{
            zipOutputStream.putNextEntry(new ZipEntry(base));
            FileInputStream fileInputStream=new FileInputStream(inputFile);
            int b;
            System.out.println(base);
            while((b=fileInputStream.read())!=-1){
                zipOutputStream.write(b);
            }
            fileInputStream.close();
        }
    }

    public static void main(String[] args) throws IOException {
     //   compress();
        Decompressing();
    }



    /**8
     * 压缩文件
     * @throws IOException
     */
    private static void compress() throws IOException {
        MyZip book=new MyZip();
        book.zip("D:\\study\\研究生\\notebook\\java后端.zip",new File("D:\\study\\研究生\\notebook\\java后端"));
        System.out.println("压缩完成");
    }
}

3. ZipInputStream压缩文件

/***
 * 解压缩
 */
private static void Decompressing() throws IOException {
    File file=new File("D:\\study\\研究生\\notebook\\java后端.zip");
    ZipInputStream zipInputStream;
    ZipFile zipFile=new ZipFile(file);
    zipInputStream=new ZipInputStream(new FileInputStream(file));
    ZipEntry zipEntry;
    while(((zipEntry=zipInputStream.getNextEntry()))!=null && !zipEntry.isDirectory()){
        File temp=new File(zipEntry.getName());
        if(!temp.exists()){
            temp.getParentFile().mkdir();
            OutputStream outputStream=new FileOutputStream(temp);
            InputStream inputStream=zipFile.getInputStream(zipEntry);
            int count;
            while((count=inputStream.read())!=-1){
                outputStream.write(count);
            }
            outputStream.close();
            inputStream.close();
        }
        zipInputStream.closeEntry();
        System.out.println(zipEntry.getName()+"解压成功");
    }
    zipInputStream.close();
}