解压缩

/*
 * 非面向对象语言要实现保存工作数据(如一个绘图程序保存一幅画面的定义),往往需要一个程序数据格式转换为外部
 * 文件格式存储,工作时再反向转换的过程.实现比较麻烦,编程不透明.而java语言是一种面向对象的语言,使用它的
 * 对象序列化特性,就可实现将工作对象(画面定义对象数据)直接写入硬盘,需要时再直接再读入内存,不需任何额外操作.实现非常
 * 方便.但由于写出对象为java类格式,因此数据冗余度较大.当数据量很大时,往往造成存储文件很大.过多的磁盘操作也导致
 * 数据读入花费了更多时间,占有了大量内存.采用gzip压缩存储对象是解决此类问题的有效手段.(在本人实现的一个
 * 监控系统中,调入一幅测试画面(10万个组件,压缩前7M,压缩后600K),压缩前对如画面后内存为26M,压缩后读入内存为12M,读入速度也大幅提高.效果十分明显).
 * java程序开发网络应用程序是它的最大优势,但在某些低速网络情况下(Internet、拨号网络).网络往往造成传输瓶颈,
 * 影响应用效果,对于实时性要求高的应用影响更大.采用压缩可以有效改善通信效果.
 * 可见,在java下的对象gzip压缩有着广泛的应用价值.以下是一个简单事例程序. 
 */
public class GzipDataInflaterManager {
	public static void main(String[] args) {
		Data testData_ = new Data();
		// 未压缩数据对象内容
		System.out.println("name=" + testData_.name + " age=" + testData_.age + " height=" + testData_.height);
		// 1 压缩
		byte[] i_ = CompressObject.writeCompressObject(testData_);

		// 2 可执行保存或网络传输,需要时还原或在对端还原

		// 3 解压缩
		Data o_ = CompressObject.readCompressObject(i_);
		
		// 解压缩后对象内容
		System.out.println("name=" + o_.name + " age=" + o_.age + " height=" + o_.height);
	}
}

final class CompressObject {
	// 将Data类型数据对象序列化对象压缩,返回字节数组,压缩后的对象数组可写入文件保存或用于网络传输
	public static byte[] writeCompressObject(Data object_) {
		byte[] data_ = null;
		try {
			// 建立字节数组输出流
			ByteArrayOutputStream o = new ByteArrayOutputStream();
			// 建立gzip压缩输出流
			GZIPOutputStream gzout = new GZIPOutputStream(o);
			// 建立对象序列化输出流
			ObjectOutputStream out = new ObjectOutputStream(gzout);
			out.writeObject(object_);
			out.flush();
			out.close();
			gzout.close();
			// 返回压缩字节流
			data_ = o.toByteArray();
			o.close();
		} catch (IOException e) {
			System.out.println(e);
		}
		return data_;
	}

	// 将压缩字节数组还原为Data类型数据对象
	public static Data readCompressObject(byte[] data_) {
		Data object_ = null;
		try {
			// 建立字节数组输入流
			ByteArrayInputStream i = new ByteArrayInputStream(data_);
			// 建立gzip解压输入流
			GZIPInputStream gzin = new GZIPInputStream(i);
			// 建立对象序列化输入流
			ObjectInputStream in = new ObjectInputStream(gzin);
			// 按制定类型还原对象
			object_ = (Data) in.readObject();
			i.close();
			gzin.close();
			in.close();
		} catch (ClassNotFoundException e) {
			System.out.println(e);
		} catch (IOException e) {
			System.out.println(e);
		}
		return object_;
	}
}

class Data implements Serializable {
	private static final long serialVersionUID = 1L;
	String name = "李冰冰";
	int age = 25;
	float height = 160f;
}

 

public class GzipFileInflaterManager {

	public static void main(String[] args) throws IOException {
		String zipName = "D:\\new file\\ff.gzip";
		String fileName = "D:\\new file\\f1.txt";
		
		String _zipName = "D:\\new file\\ff.gzip";
		String _fileName = "D:\\new file\\f11.txt";
		
		gzip(zipName, fileName);
		ungzip(_zipName, _fileName);
	}
	
	private static void gzip(String zipName, String fileName) throws IOException {
		FileInputStream fis = new FileInputStream(fileName);
		
		FileOutputStream fos = new FileOutputStream(zipName);
		GZIPOutputStream gos = new GZIPOutputStream(fos);

		byte[] bytes = new byte[1024];
		int size = 0;
		
		while ( (size = fis.read(bytes)) != -1 ) {
			gos.write(bytes, 0, size);
		}
		
		gos.flush();
		gos.close();
		fos.close();
		fis.close();
	}
	
	private static void ungzip(String zipName, String fileName) throws IOException {
		FileInputStream fis = new FileInputStream(zipName);
		GZIPInputStream gis = new GZIPInputStream(fis);
		
		FileOutputStream fos = new FileOutputStream(fileName);
		
		byte[] bytes = new byte[1024];
		int size = 0;
		
		while ( (size = gis.read(bytes, 0, bytes.length)) != -1 ) {
			fos.write(bytes, 0, size);
		}
		
		fos.flush();
		gis.close();
		fos.close();
		fis.close();
	}
}

 

public class InflaterManagerImpl{
	public static void main(String[] args){
	   InflaterManager ifm=new InflaterManager();
	   ifm.inflat("D:\\new file\\tgz.tar");
	}
} 

class InflaterManager {
	public void inflat(String path) {
		File file = new File(path), tempFile = null;
		InputStream fis = null;
		OutputStream fos = null;
		TarInputStream zis = null;
		try {
			fis = new FileInputStream(file);
			zis = new TarInputStream(fis);
			TarEntry tarEntry = null; //关键在于这个TarEntry 的理解，实际你的tar包里有多少文件就有多少TarEntry
			while ((tarEntry = zis.getNextEntry()) != null) {
				tempFile = new File("D:\\new file\\" + tarEntry.getName());
				tempFile.createNewFile();
				fos = new FileOutputStream(tempFile);
				byte[] buf = new byte[1024];
				int size = 0;
				while ((size = zis.read(buf)) != -1) {
					fos.write(buf, 0, size);
				}
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				fos.flush();
				fis.close();
				zis.close();
				fos.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
} 

 

public class ZipFileInflaterManager {

	public static void main(String[] args) throws IOException {
//		String[] filesName = new String[3];
//		String zipName = "D:\\new file\\ff.zip";
//		filesName[0] = "f1.txt";
//		filesName[1] = "f2.txt";
//		filesName[2] = "f3.txt";
//		zip(zipName, filesName);
		
		
		String[] _filesName = new String[3];
		String _zipName = "D:\\new file\\f.zip";
		_filesName[0] = "D:\\new file\\f1.txt";
		_filesName[1] = "D:\\new file\\f2.txt";
		_filesName[2] = "D:\\new file\\f3.txt";
		unzip(_zipName, _filesName);
	}

	private static void zip(String zipName, String[] filesName) throws IOException {
		String path = "D:\\new file\\";
		FileOutputStream fos = new FileOutputStream(zipName);
		ZipOutputStream zos = new ZipOutputStream(fos);
		
		for (String fileName : filesName) {
			int size = 0;
			byte[] bytes = new byte[128];
			
			// 建立要压缩的文件
			ZipEntry ze = new ZipEntry(fileName);
			zos.putNextEntry(ze);
			
			// 向要压缩的文件中写入内容
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			FileInputStream fis = new FileInputStream(path + fileName);
			while ((size = fis.read(bytes)) != -1) {
				baos.write(bytes, 0, size);
			}
			zos.write(baos.toByteArray());
			
			// 结束
			zos.flush();
			fis.close();
		}
		zos.close();
		fos.close();
	}
	
	private static void unzip(String zipName, String[] filesName) throws IOException {
		int size = 0, i = 0;
		byte[] bytes = new byte[128];
		
		FileInputStream fis = new FileInputStream(zipName);
		ZipInputStream zis = new ZipInputStream(fis);

//		ZipEntry ze = null;
//		while ((ze = zis.getNextEntry()) != null) {
		while (zis.getNextEntry() != null) {
			FileOutputStream fos = new FileOutputStream(filesName[i++]);
			while ((size = zis.read(bytes)) != -1) {
				fos.write(bytes, 0, size);
			}
			
			fos.flush();
			fos.close();
			zis.closeEntry();
		}
		fis.close();
		zis.close();
	}
}

 

public class FileOperate {
	private String message;

	/**
	 * 读取文本文件内容
	 * @param filePathAndName 带有完整绝对路径的文件名
	 * @param encoding 文本文件打开的编码方式
	 * @return 返回文本文件的内容
	 */
	public String readTxt(String filePathAndName, String encoding) throws IOException {
		encoding = encoding.trim();
		StringBuffer str = new StringBuffer("");
		String st = "";
		try {
			FileInputStream fs = new FileInputStream(filePathAndName);
			InputStreamReader isr;
			if (encoding.equals("")) {
				isr = new InputStreamReader(fs);
			} else {
				isr = new InputStreamReader(fs, encoding);
			}
			BufferedReader br = new BufferedReader(isr);
			try {
				String data = "";
				while ((data = br.readLine()) != null) {
					str.append(data + " ");
				}
			} catch (Exception e) {
				str.append(e.toString());
			}
			st = str.toString();
		} catch (IOException es) {
			st = "";
		}
		return st;
	}

	/**
	 * 新建目录
	 * @param folderPath 目录
	 * @return 返回目录创建后的路径
	 */
	public String createFolder(String folderPath) {
		String txt = folderPath;
		try {
			java.io.File myFilePath = new java.io.File(txt);
			txt = folderPath;
			if (!myFilePath.exists()) {
				myFilePath.mkdir();
			}
		} catch (Exception e) {
			message = "创建目录操作出错";
		}
		return txt;
	}

	/**
	 * 多级目录创建
	 * @param folderPath 准备要在本级目录下创建新目录的目录路径 例如 c:myf
	 * @param paths 无限级目录参数，各级目录以单数线区分 例如 a|b|c
	 * @return 返回创建文件后的路径 例如 c:myfac
	 */
	public String createFolders(String folderPath, String paths) {
		String txts = folderPath;
		try {
			String txt;
			txts = folderPath;
			StringTokenizer st = new StringTokenizer(paths, "|");
			for (int i = 0; st.hasMoreTokens(); i++) {
				txt = st.nextToken().trim();
				if (txts.lastIndexOf("/") != -1) {
					txts = createFolder(txts + txt);
				} else {
					txts = createFolder(txts + txt + "/");
				}
			}
		} catch (Exception e) {
			message = "创建目录操作出错！";
		}
		return txts;
	}

	/**
	 * 新建文件
	 * @param filePathAndName 文本文件完整绝对路径及文件名
	 * @param fileContent 文本文件内容
	 */
	public void createFile(String filePathAndName, String fileContent) {

		try {
			String filePath = filePathAndName;
			filePath = filePath.toString();
			File myFilePath = new File(filePath);
			if (!myFilePath.exists()) {
				myFilePath.createNewFile();
			}
			FileWriter resultFile = new FileWriter(myFilePath);
			PrintWriter myFile = new PrintWriter(resultFile);
			String strContent = fileContent;
			myFile.println(strContent);
			myFile.close();
			resultFile.close();
		} catch (Exception e) {
			message = "创建文件操作出错";
		}
	}

	/**
	 * 有编码方式的文件创建
	 * @param filePathAndName 文本文件完整绝对路径及文件名
	 * @param fileContent 文本文件内容
	 * @param encoding 编码方式 例如 GBK 或者 UTF-8
	 */
	public void createFile(String filePathAndName, String fileContent,
			String encoding) {

		try {
			String filePath = filePathAndName;
			filePath = filePath.toString();
			File myFilePath = new File(filePath);
			if (!myFilePath.exists()) {
				myFilePath.createNewFile();
			}
			PrintWriter myFile = new PrintWriter(myFilePath, encoding);
			String strContent = fileContent;
			myFile.println(strContent);
			myFile.close();
		} catch (Exception e) {
			message = "创建文件操作出错";
		}
	}

	/**
	 * 删除文件
	 * @param filePathAndName 文本文件完整绝对路径及文件名
	 * @return Boolean 成功删除返回true遭遇异常返回false
	 */
	public boolean delFile(String filePathAndName) {
	     boolean bea = false;
	        try {
	            String filePath = filePathAndName;
	            File myDelFile = new File(filePath);
	            if(myDelFile.exists()){
	             myDelFile.delete();
	             bea = true;
	            }else{
	             bea = false;
	             message = (filePathAndName + "删除文件操作出错");
	            }
	        }
	        catch (Exception e) {
	            message = e.toString();
	        }
	        return bea;
	    }

	/**
	 * 删除文件夹
	 * @param folderPath 文件夹完整绝对路径
	 */
	public void delFolder(String folderPath) {
		try {
			delAllFile(folderPath); // 删除完里面所有内容
			String filePath = folderPath;
			filePath = filePath.toString();
			java.io.File myFilePath = new java.io.File(filePath);
			myFilePath.delete(); // 删除空文件夹
		} catch (Exception e) {
			message = ("删除文件夹操作出错");
		}
	}

	/**
	 * 删除指定文件夹下所有文件
	 * @param path 文件夹完整绝对路径
	 */
	public boolean delAllFile(String path) {
		boolean bea = false;
		File file = new File(path);
		if (!file.exists()) {
			return bea;
		}
		if (!file.isDirectory()) {
			return bea;
		}
		String[] tempList = file.list();
		File temp = null;
		for (int i = 0; i < tempList.length; i++) {
			if (path.endsWith(File.separator)) {
				temp = new File(path + tempList[i]);
			} else {
				temp = new File(path + File.separator + tempList[i]);
			}
			if (temp.isFile()) {
				temp.delete();
			}
			if (temp.isDirectory()) {
				delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件
				delFolder(path + "/" + tempList[i]);// 再删除空文件夹
				bea = true;
			}
		}
		return bea;
	}

	/**
	 * 复制单个文件
	 * @param oldPathFile 准备复制的文件源
	 * @param newPathFile 拷贝到新绝对路径带文件名
	 */
	public void copyFile(String oldPathFile, String newPathFile) {
		try {
			int bytesum = 0;
			int byteread = 0;
			File oldfile = new File(oldPathFile);
			if (oldfile.exists()) { // 文件存在时
				InputStream inStream = new FileInputStream(oldPathFile); // 读入原文件
				FileOutputStream fs = new FileOutputStream(newPathFile);
				byte[] buffer = new byte[1444];
				while ((byteread = inStream.read(buffer)) != -1) {
					bytesum += byteread; // 字节数 文件大小
					System.out.println(bytesum);
					fs.write(buffer, 0, byteread);
				}
				inStream.close();
			}
		} catch (Exception e) {
			message = ("复制单个文件操作出错");
		}
	}

	/**
	 * 复制整个文件夹的内容
	 * @param oldPath 准备拷贝的目录
	 * @param newPath 指定绝对路径的新目录
	 */
	public void copyFolder(String oldPath, String newPath) {
		try {
			new File(newPath).mkdirs(); // 如果文件夹不存在 则建立新文件夹
			File a = new File(oldPath);
			String[] file = a.list();
			File temp = null;
			for (int i = 0; i < file.length; i++) {
				if (oldPath.endsWith(File.separator)) {
					temp = new File(oldPath + file[i]);
				} else {
					temp = new File(oldPath + File.separator + file[i]);
				}
				if (temp.isFile()) {
					FileInputStream input = new FileInputStream(temp);
					FileOutputStream output = new FileOutputStream(newPath
							+ "/" + (temp.getName()).toString());
					byte[] b = new byte[1024 * 5];
					int len;
					while ((len = input.read(b)) != -1) {
						output.write(b, 0, len);
					}
					output.flush();
					output.close();
					input.close();
				}
				if (temp.isDirectory()) {// 如果是子文件夹
					copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
				}
			}
		} catch (Exception e) {
			message = "复制整个文件夹内容操作出错";
		}
	}

	/**
	 * 移动文件
	 */
	public void moveFile(String oldPath, String newPath) {
		copyFile(oldPath, newPath);
		delFile(oldPath);
	}

	/**
	 * 移动目录
	 */
	public void moveFolder(String oldPath, String newPath) {
		copyFolder(oldPath, newPath);
		delFolder(oldPath);
	}

	public String getMessage() {
		return this.message;
	}
}

 

public class InflaterManagerImpl {
	public static void main(String[] args) throws IOException {
		ungzip("D:\\newfile\\fe569190-b628-012c-8680-0019e3436cf2.tgz");
	}

	private static void ungzip(String path_tgz) {
		String path_tar = path_tgz.substring(0, path_tgz.indexOf(".tgz")) + ".tar";
		
		/**
		 * ungzip
		 */
		InputStream fis_tgz = null;
		InputStream gis_tgz = null;
		FileOutputStream fos_tar = null;
		File file_tar = null;
		try {
			// Input the file which's suffix is tgz
			fis_tgz = new FileInputStream(path_tgz);
			gis_tgz = new GZIPInputStream(fis_tgz);
			
			// Output the file which's suffix is tar
			file_tar = new File(path_tar);
			file_tar.createNewFile();
			fos_tar = new FileOutputStream(file_tar);
			byte[] bytes = new byte[1024];
			int size = 0;
			while ((size = gis_tgz.read(bytes, 0, bytes.length)) != -1) {
				fos_tar.write(bytes, 0, size);
			}
			fos_tar.flush();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				fos_tar.close();
				gis_tgz.close();
				fis_tgz.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		
		
		/**
		 * untar
		 */
		InputStream fis_tar = null;
		TarInputStream tis_tar = null;
		OutputStream fos_doc = null;
		try {
			// Input the file which's suffix is tar
			fis_tar = new FileInputStream(file_tar);
			tis_tar = new TarInputStream(fis_tar);
			TarEntry tarEntry = null; // 关键在于这个TarEntry的理解，实际你的tar包里有多少文件就有多少TarEntry
			String path_doc = null;
			while ((tarEntry = tis_tar.getNextEntry()) != null) {
				if (path_doc == null) {
					path_doc = path_tgz.substring(0, path_tgz.indexOf(tarEntry.getName().substring(0, tarEntry.getName().length() - 1)));
				}
				File tempFile = new File(path_doc + tarEntry.getName());
				if (tarEntry.isDirectory()) {
					tempFile.mkdirs();
				} else {
					tempFile.createNewFile();
					fos_doc = new FileOutputStream(tempFile);
					byte[] buf = new byte[1024];
					int size = 0;
					while ((size = tis_tar.read(buf)) != -1) {
						fos_doc.write(buf, 0, size);
					}
				}
			}
			fos_doc.flush();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				fos_doc.close();
				tis_tar.close();
				fis_tar.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

 

22 用到了javatar包