java 压缩和解压缩文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 压缩，解压，删除，拷贝操作。
 * 
 * 注意：此类中用到的压缩类ZipEntry等都来自于org.apache.tools包而非java.util。此包在ant.jar中有。
 * 
 * * @author Tony
 */
public class FileUtil {
	protected static Logger log = LoggerFactory.getLogger(FileUtil.class);

	/**
	 * 
	 * 压缩文件
	 * 
	 * @param inputFileName
	 *            要压缩的文件或文件夹路径，例如：c:\\a.txt,c:\\a\
	 * 
	 * @param outputFileName
	 *            输出zip文件的路径，例如：c:\\a.zip
	 * 
	 */
	public static void zip(String inputFileName, String outputFileName)
			throws Exception {
		ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
				outputFileName));
		zip(out, new File(inputFileName), "");
		log.debug("压缩完成！");
		out.closeEntry();
		out.close();
	}

	/**
	 * 
	 * 压缩文件
	 * 
	 * @param out
	 *            org.apache.tools.zip.ZipOutputStream
	 * 
	 * @param file
	 *            待压缩的文件
	 * 
	 * @param base
	 *            压缩的根目录
	 * 
	 */
	private static void zip(ZipOutputStream out, File file, String base)
			throws Exception {
		if (file.isDirectory()) {
			File[] fl = file.listFiles();
			base = base.length() == 0 ? "" : base + File.separator;
			for (int i = 0; i < fl.length; i++) {
				zip(out, fl[i], base + fl[i].getName());
			}
		} else {
			out.putNextEntry(new ZipEntry(base));
			log.debug("添加压缩文件：" + base);
			FileInputStream in = new FileInputStream(file);
			int b;
			while ((b = in.read()) != -1) {
				out.write(b);
			}
			in.close();
		}
	}

	/**
	 * 
	 * 解压zip文件
	 * 
	 * @param zipFileName
	 *            待解压的zip文件路径，例如：c:\\a.zip
	 * 
	 * @param outputDirectory
	 *            解压目标文件夹,例如：c:\\a\
	 * 
	 */
	public static void unZip(String zipFileName, String outputDirectory)
			throws Exception {
		ZipFile zipFile = new ZipFile(zipFileName);
		try {
			Enumeration<?> e = zipFile.getEntries();
			ZipEntry zipEntry = null;
			createDirectory(outputDirectory, "");
			while (e.hasMoreElements()) {
				zipEntry = (ZipEntry) e.nextElement();
				log.debug("解压：" + zipEntry.getName());
				if (zipEntry.isDirectory()) {
					String name = zipEntry.getName();
					name = name.substring(0, name.length() - 1);
					File f = new File(outputDirectory + File.separator + name);
					f.mkdir();
					log.debug("创建目录：" + outputDirectory + File.separator + name);
				} else {
					String fileName = zipEntry.getName();
					fileName = fileName.replace('\\', '/');
					if (fileName.indexOf("/") != -1) {
						createDirectory(outputDirectory, fileName.substring(0,
								fileName.lastIndexOf("/")));
						fileName = fileName.substring(
								fileName.lastIndexOf("/") + 1,
								fileName.length());
					}
					File f = new File(outputDirectory + File.separator
							+ zipEntry.getName());
					f.createNewFile();
					InputStream in = zipFile.getInputStream(zipEntry);
					FileOutputStream out = new FileOutputStream(f);
					byte[] by = new byte[1024];
					int c;
					while ((c = in.read(by)) != -1) {
						out.write(by, 0, c);
					}
					in.close();
					out.close();
				}
			}
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		} finally {
			zipFile.close();
			log.debug("解压完成！");
		}
	}

}

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