java 解析压缩文件-rar,zip

package impl;

import inter.AbstractUnCompressService;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

/**
 * This class is used to uncompress rar & zip compress file
 * 
 * @author Jacky.Dong
 * 
 */
public class ZipUnCompressServiceImpl extends AbstractUnCompressService {

	private static final String SUFFIX_RAR = ".rar";
	private static final String SUFFIX_ZIP = ".zip";

	@Override
	public void unCompressFolder(String folder) {
		// TODO Auto-generated method stub

	}

	@Override
	@SuppressWarnings("rawtypes")
	public void unCompressFile(String zipFilename, String outputDirectory)
			throws IOException {

		if (null == outputDirectory) {
			outputDirectory = zipFilename.replace(SUFFIX_RAR, "").replace(
					SUFFIX_ZIP, "");
		}

		File outFile = new File(outputDirectory);
		if (!outFile.exists()) {
			outFile.mkdirs();
		}

		ZipFile zipFile = new ZipFile(zipFilename);

		Enumeration en = zipFile.entries();
		ZipEntry zipEntry = null;
		while (en.hasMoreElements()) {
			zipEntry = (ZipEntry) en.nextElement();
			if (zipEntry.isDirectory()) {
				// mkdir directory
				String dirName = zipEntry.getName();
				// System.out.println("=dirName is:=" + dirName + "=end=");
				dirName = dirName.substring(0, dirName.length() - 1);
				File f = new File(outFile.getPath() + File.separator + dirName);
				f.mkdirs();
			} else {
				// unzip file
				String strFilePath = outFile.getPath() + File.separator
						+ zipEntry.getName();
				File f = new File(strFilePath);

				// 判断文件不存在的话，就创建该文件所在文件夹的目录
				if (!f.exists()) {
					String[] arrFolderName = zipEntry.getName().split(
							File.separator);
					String strRealFolder = "";
					for (int i = 0; i < (arrFolderName.length - 1); i++) {
						strRealFolder += arrFolderName[i] + File.separator;
					}
					strRealFolder = outFile.getPath() + File.separator
							+ strRealFolder;
					File tempDir = new File(strRealFolder);
					// 此处使用.mkdirs()方法，而不能用.mkdir()
					tempDir.mkdirs();
				}
				// ////end///
				f.createNewFile();
				InputStream in = zipFile.getInputStream(zipEntry);
				FileOutputStream out = new FileOutputStream(f);
				try {
					int c;
					byte[] by = new byte[BUFFEREDSIZE];
					while ((c = in.read(by)) != -1) {
						out.write(by, 0, c);
					}
					out.flush();
				} catch (IOException e) {
					throw e;
				} finally {
					out.close();
					in.close();
				}
			}
		}
	}

}