Java解压和压缩带密码的zip文件过程详解

package com.ninemax.demo.zip.decrypt;import java.io.File;import java.io.IOException;import java.util.List;import java.util.zip.DataFormatException;import org.apache.commons.io.FileUtils;import de.idyl.winzipaes.AesZipFileDecrypter;import de.idyl.winzipaes.AesZipFileEncrypter;import de.idyl.winzipaes.impl.AESDecrypter;import de.idyl.winzipaes.impl.AESDecrypterBC;import de.idyl.winzipaes.impl.AESEncrypter;import de.idyl.winzipaes.impl.AESEncrypterBC;import de.idyl.winzipaes.impl.ExtZipEntry; /** * 压缩指定文件或目录为ZIP格式压缩文件 * 支持中文(修改源码后) * 支持密码(仅支持256bit的AES加密解密) * 依赖bcprov项目(bcprov-jdk16-140.jar) *  * @author zyh */public class DecryptionZipUtil {		/**	 * 使用指定密码将给定文件或文件夹压缩成指定的输出ZIP文件	 * @param srcFile 需要压缩的文件或文件夹	 * @param destPath 输出路径	 * @param passwd 压缩文件使用的密码	 */	public static void zip(String srcFile,String destPath,String passwd) {		AESEncrypter encrypter = new AESEncrypterBC();		AesZipFileEncrypter zipFileEncrypter = null;		try {			zipFileEncrypter = new AesZipFileEncrypter(destPath, encrypter);			/**			 * 此方法是修改源码后添加,用以支持中文文件名			 */			zipFileEncrypter.setEncoding("utf8");			File sFile = new File(srcFile);			/**			 * AesZipFileEncrypter提供了重载的添加Entry的方法,其中:			 * add(File f, String passwd) 			 * 			方法是将文件直接添加进压缩文件			 * 			 * add(File f, String pathForEntry, String passwd)			 * 			方法是按指定路径将文件添加进压缩文件			 * pathForEntry - to be used for addition of the file (path within zip file)			 */			doZip(sFile, zipFileEncrypter, "", passwd);		} catch (IOException e) {			e.printStackTrace();		} finally {			try {				zipFileEncrypter.close();			} catch (IOException e) {				e.printStackTrace();			}		}	}		/**	 * 具体压缩方法,将给定文件添加进压缩文件中,并处理压缩文件中的路径	 * @param file 给定磁盘文件(是文件直接添加,是目录递归调用添加)	 * @param encrypter AesZipFileEncrypter实例,用于输出加密ZIP文件	 * @param pathForEntry ZIP文件中的路径	 * @param passwd 压缩密码	 * @throws IOException	 */	private static void doZip(File file, AesZipFileEncrypter encrypter,			String pathForEntry, String passwd) throws IOException {		if (file.isFile()) {			pathForEntry += file.getName();			encrypter.add(file, pathForEntry, passwd);			return;		}		pathForEntry += file.getName() + File.separator;		for(File subFile : file.listFiles()) {			doZip(subFile, encrypter, pathForEntry, passwd);		}	}		/**	 * 使用给定密码解压指定压缩文件到指定目录	 * @param inFile 指定Zip文件	 * @param outDir 解压目录	 * @param passwd 解压密码	 */	public static void unzip(String inFile, String outDir, String passwd) {		File outDirectory = new File(outDir);		if (!outDirectory.exists()) {			outDirectory.mkdir();		}		AESDecrypter decrypter = new AESDecrypterBC();		AesZipFileDecrypter zipDecrypter = null;		try {			zipDecrypter = new AesZipFileDecrypter(new File(inFile), decrypter);			AesZipFileDecrypter.charset = "utf-8";			/**			 * 得到ZIP文件中所有Entry,但此处好像与JDK里不同,目录不视为Entry			 * 需要创建文件夹,entry.isDirectory()方法同样不适用,不知道是不是自己使用错误			 * 处理文件夹问题处理可能不太好			 */			List<ExtZipEntry> entryList = zipDecrypter.getEntryList();			for(ExtZipEntry entry : entryList) {				String eName = entry.getName();				String dir = eName.substring(0, eName.lastIndexOf(File.separator) + 1);				File extractDir = new File(outDir, dir);				if (!extractDir.exists()) {					FileUtils.forceMkdir(extractDir);				}				/**				 * 抽出文件				 */				File extractFile = new File(outDir + File.separator + eName);				zipDecrypter.extractEntry(entry, extractFile, passwd);			}		} catch (IOException e) {			e.printStackTrace();		} catch (DataFormatException e) {			e.printStackTrace();		} finally {			try {				zipDecrypter.close();			} catch (IOException e) {				e.printStackTrace();			}		}	} 	/**	 * 测试	 * @param args	 */	public static void main(String[] args) {		/**		 * 压缩测试		 * 可以传文件或者目录		 *///		zip("M://ZIP//test//bb//a//t.txt", "M://ZIP//test//temp1.zip", "zyh");//		zip("M://ZIP//test//bb", "M://ZIP//test//temp2.zip", "zyh");				unzip("M://ZIP//test//temp2.zip", "M://ZIP//test//temp", "zyh");	}}

protected String encoding = "iso-8859-1";	public boolean utf8Flg = false;	public void setEncoding(String encoding) {		this.encoding = encoding;		utf8Flg |= isUTF8(encoding);	}	protected boolean isUTF8(String encoding) {    if (encoding == null) {      // check platform's default encoding      encoding = System.getProperty("file.encoding");    }    return "UTF8".equalsIgnoreCase(encoding)      || "UTF-8".equalsIgnoreCase(encoding);  }

writeShort(entry.getName().getBytes(encoding).length); // file name length

public void initEncryptedEntry(boolean utf8Flag) {	setCrc(0); // CRC-32 / for encrypted files it's 0 as AES/MAC checks integritiy 	this.flag |= 1; // bit0 - encrypted	if (utf8Flag) {		this.flag |=(1 << 11);	}	// flag |= 8; // bit3 - use data descriptor	this.primaryCompressionMethod = 0x63; 	byte[] extraBytes = new byte[11];	extraBytes = new byte[11];	// extra data header ID for AES encryption is 0x9901	extraBytes[0] = 0x01;	extraBytes[1] = (byte)0x99; 	// data size (currently 7, but subject to possible increase in the	// future)	extraBytes[2] = 0x07; // data size	extraBytes[3] = 0x00; // data size	// Integer version number specific to the zip vendor	extraBytes[4] = 0x02; // version number	extraBytes[5] = 0x00; // version number 	// 2-character vendor ID	extraBytes[6] = 0x41; // vendor id	extraBytes[7] = 0x45; // vendor id 	// AES encryption strength - 1=128, 2=192, 3=256	extraBytes[8] = 0x03; 	// actual compression method - 0x0000==stored (no compression) - 2 bytes	extraBytes[9] = (byte) (getMethod() & 0xff);	extraBytes[10] = (byte) ((getMethod() & 0xff00) >> 8); 	setExtra(extraBytes);}

if (utf8Flag) {this.flag |=(1 << 11);}