解压缩文件

ZipInputStream

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class Zip {

	/**
	 * @param args
	 */
	public static int iCompressLevel; // 压缩比 取值范围为0~9
	public static boolean bOverWrite; // 是否覆盖同名文件 取值范围为True和False
	private static ArrayList allFiles = new ArrayList();
	public static String sErrorMessage;

	public static ArrayList Ectract(String sZipPathFile, String sDestPath) {
		ArrayList allFileName = new ArrayList();
		try {
			// 先指定压缩档的位置和档名，建立FileInputStream对象
			FileInputStream fins = new FileInputStream(sZipPathFile);
			// 将fins传入ZipInputStream中
			ZipInputStream zins = new ZipInputStream(fins);
			ZipEntry ze = null;
			byte ch[] = new byte[256];
			while ((ze = zins.getNextEntry()) != null) {
				File zfile = new File(sDestPath + ze.getName());
				File fpath = new File(zfile.getParentFile().getPath());
				if (ze.isDirectory()) {
					if (!zfile.exists())
						zfile.mkdirs();
					zins.closeEntry();
				} else {
					if (!fpath.exists())
						fpath.mkdirs();
					FileOutputStream fouts = new FileOutputStream(zfile);
					int i;
					allFileName.add(zfile.getAbsolutePath());
					while ((i = zins.read(ch)) != -1)
						fouts.write(ch, 0, i);
					zins.closeEntry();
					fouts.close();
				}
			}
			fins.close();
			zins.close();
			sErrorMessage = "OK";
		} catch (Exception e) {
			System.err.println("Extract error:" + e.getMessage());
			sErrorMessage = e.getMessage();
		}
		allFiles.clear();
		return allFileName;
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Zip z = new Zip();
		ArrayList a = new ArrayList();
		a = z.Ectract("d:\\temple.zip", "d:\\zip\\");
		System.out.println(a.size());
	}  

}

GZIPInputStream

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;

public class GZIPDemo {
	
	public static void unZipDemo(String from,String to){
		try {
			int nnumber;
			FileInputStream fin = new FileInputStream(
					from);
			GZIPInputStream MmGz = new GZIPInputStream(fin);
			File zfile = new File(to);
			FileOutputStream fout = new FileOutputStream(zfile);
			byte[] buf = new byte[1024];
			nnumber = MmGz.read(buf, 0, buf.length);
			while (nnumber != -1) {
				fout.write(buf, 0, nnumber);
				nnumber = MmGz.read(buf, 0, buf.length);
			}
			MmGz.close();
			fout.close();
			fin.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public static void main(String[] args) throws IOException {
		//c:\\az_AZ0001_P_2010-4-9.zip
		unZipDemo("c:\\az_AZ0001_P_2010-4-9.zip","c:\\zip\\az_AZ0001_P_2010-4-9.xlsx");
	}
}