zip

一、基于java原生api实现生成zip和解压zip

参考文档

https://www.cnblogs.com/lrh-xl/p/5509005.html
https://www.liaoxuefeng.com/wiki/1252599548343744/1298366336073762

1、生成zip

使用到ZipOutputStream

   /**
    * 生成zip文件
    * @throws IOException 
    * @throws FileNotFoundException 
    */
   private static void toZip() throws FileNotFoundException, IOException {
   	String filePath = "D:\\TODO";
   	try(ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(filePath.concat(File.separator).concat("toZip.zip")))){
   		List<File> filesList = getAllFiles("D:\\GAME\\RES", new ArrayList<>());
   		filesList.stream().filter(f->!f.getName().contains(".zip")).forEach(f->{
   			try {
   				System.out.println(f.getName());
				zos.putNextEntry(new ZipEntry(f.getName()));
    			zos.write(getFileDataAsByte(f));
    			zos.closeEntry();
			} catch (IOException e) {
				e.printStackTrace();
			}
   		});
   	}
}
   
   /**
    * file转byte
    * @param f
    * @return
    * @throws IOException 
    */
   private static byte[] getFileDataAsByte(File f) throws IOException {
   	InputStream is = new FileInputStream(f);
   	ByteArrayOutputStream bStream = new ByteArrayOutputStream(1024);
   	byte[] by = new byte[1024];
   	int len = -1;
   	while ((len=is.read(by))!=-1) {
		bStream.write(by, 0, len);
	}
	return bStream.toByteArray();
}

   /**
    * 获取指定磁盘文件下的所有文件
    * @param filePath
    * @param filesList
    * @return
    */
private static List<File> getAllFiles(String filePath,List<File> filesList) {
	File file = new File(filePath);
	File[] files=file.listFiles();
	for(File f:files) {
		if (f.isFile()) {
			filesList.add(f);
		}
		if (f.isDirectory()) {
			getAllFiles(f.getAbsolutePath(), filesList);
		}
	}
	return filesList;
   }

2、解压zip

使用到ZipOutputStream和ZipFile

/**
	 * 以zip文件名解压到对应文件夹下面
	 * @throws IOException 
	 * @throws FileNotFoundException 
	 */
	private static void fromZip() throws FileNotFoundException, IOException {
    	String zipPath = "D:\\TODO\\toZip.zip";
    	File file = new File(zipPath);
    	if(!file.exists()) {
    		return;
    	}
		try(	ZipInputStream zis = new ZipInputStream(new FileInputStream(file));
				ZipFile zipFile = new ZipFile(file)){
			ZipEntry zipEntry = null;
			while ((zipEntry=zis.getNextEntry())!=null) {
				System.err.println(zipEntry.getName());
				if (!zipEntry.isDirectory()) {
					File outFile = new File(
							file.getParent()
							.concat(File.separator)
							.concat(file.getName().substring(0,file.getName().indexOf(".")))
							.concat(File.separator)
							.concat(zipEntry.getName())
							);
					if(!outFile.getParentFile().exists()) {
						outFile.getParentFile().mkdir();
					}
					if(!outFile.exists()) {
						outFile.createNewFile();
					}
					BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(zipEntry));
					BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(outFile));
					byte b[] =  new byte[1024];
					int len = -1;
					while ((len=bis.read(b))!=-1) {
						bos.write(b,0,len);
					}
				}
			}
		}
	}