java 解析压缩文件-7z

package impl;

import inter.AbstractUnCompressService;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.compress.archivers.sevenz.SevenZArchiveEntry;
import org.apache.commons.compress.archivers.sevenz.SevenZFile;

/**
 * This file is used to uncompress 7z file
 * 
 * @author Jacky.Dong
 * 
 */
public class SevenZUnCompressServiceImpl extends AbstractUnCompressService {

	private static final String SUFFIX_SEVENZ = ".7z";

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

	}

	@Override
	public void unCompressFile(String inputFilePath, String outputDir)
			throws IOException {

		File inputFile = new File(inputFilePath);
		// if output directory is not specify,we will use input file parent path
		// +
		// compress file name as output file path
		if (outputDir == null) {
			outputDir = inputFile.getPath().replace(SUFFIX_SEVENZ, "")
					+ File.separator;
		}

		try {
			// create 7z input stream
			SevenZFile zFile = new SevenZFile(inputFile);
			SevenZArchiveEntry entry = null;

			while ((entry = zFile.getNextEntry()) != null) {

				// once entry is a directory we will create a new directory
				if (entry.isDirectory()) {
					createDirectory(outputDir, entry.getName());

				} else {

					File tmpFile = new File(outputDir + File.separator
							+ entry.getName());
					createDirectory(tmpFile.getParent() + File.separator, null);
					OutputStream out = null;

					try {
						out = new FileOutputStream(tmpFile);
						int length = 0;
						byte[] b = new byte[BUFFEREDSIZE];

						while ((length = zFile.read(b)) != -1) {
							out.write(b, 0, length);
						}
					} catch (IOException ex) {
						throw ex;
					} finally {

						if (out != null)
							out.close();
					}

				}
			}

		} catch (Exception ex) {
			System.err.println(ex.toString());
		}
	}

}