zipselfextractor.java

java zip文件处理,用来解压缩zip文件

/*
 * 创建日期 2004-9-8
 *
 * 更改所生成文件模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */

package ext.util.zip;
/* ZipSelfExtractor.java */
/* Author: Z.S. Jin 
   Updates: John D. Mitchell */

import java.io.*;
import java.net.*;
import javax.swing.*;
import java.util.zip.*;
import java.util.*;
import java.text.*;

public class ZipSelfExtractor extends JFrame
{
	private String myClassName;
	static String MANIFEST = "META-INF/MANIFEST.MF";

	public static void main(String[] args)
	{
		ZipSelfExtractor zse = new ZipSelfExtractor();
		String jarFileName = zse.getJarFileName();
		zse.extract(jarFileName);
		System.exit(0);
	}

	ZipSelfExtractor()
	{
	}

	private String getJarFileName()
	{
		myClassName = this.getClass().getName() + ".class";
		URL urlJar =
			this.getClass().getClassLoader().getSystemResource(myClassName);
		String urlStr = urlJar.toString();
		int from = "jar:file:".length();
		int to = urlStr.indexOf("!/");
		return urlStr.substring(from, to);
	}

	public void extract(String zipfile)
	{
		File currentArchive = new File(zipfile);

		JFileChooser fc = new JFileChooser();

		fc.setCurrentDirectory(new File("."));
		fc.setDialogType(JFileChooser.OPEN_DIALOG);
		fc.setDialogTitle(
			"Select destination directory for extracting "
				+ currentArchive.getName());
		fc.setMultiSelectionEnabled(false);

		fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

		if (fc.showDialog(ZipSelfExtractor.this, "Select")
			!= JFileChooser.APPROVE_OPTION)
		{
			return;
			//only when user select valid dir, it can return approve_option
		}

		File outputDir = fc.getSelectedFile();

		byte[] buf = new byte[1024];
		SimpleDateFormat formatter =
			new SimpleDateFormat("MM/dd/yyyy hh:mma", Locale.getDefault());

		ProgressMonitor pm = null;

		boolean overwrite = false;

		ZipFile zf = null;
		FileOutputStream out = null;
		InputStream in = null;

		try
		{
			zf = new ZipFile(currentArchive);

			int size = zf.size();
			int extracted = 0;
			pm =
				new ProgressMonitor(
					getParent(),
					"Extracting files...",
					"starting",
					0,
					size - 4);
			pm.setMillisToDecideToPopup(0);
			pm.setMillisToPopup(0);

			Enumeration entries = zf.entries();

			for (int i = 0; i < size; i++)
			{
				ZipEntry entry = (ZipEntry) entries.nextElement();
				if (entry.isDirectory())
					continue;

				String pathname = entry.getName();
				if (myClassName.equals(pathname)
					|| MANIFEST.equals(pathname.toUpperCase()))
					continue;

				extracted++;
				pm.setProgress(i);
				pm.setNote(pathname);
				if (pm.isCanceled())
					return;

				in = zf.getInputStream(entry);

				File outFile = new File(outputDir, pathname);
				Date archiveTime = new Date(entry.getTime());

				if (overwrite == false)
				{
					if (outFile.exists())
					{
						Object[] options = { "Yes", "Yes To All", "No" };
						Date existTime = new Date(outFile.lastModified());
						Long archiveLen = new Long(entry.getSize());

						String msg =
							"File name conflict: "
								+ "There is already a file with "
								+ "that name on the disk!\n"
								+ "\nFile name: "
								+ outFile.getName()
								+ "\nExisting file: "
								+ formatter.format(existTime)
								+ ", "
								+ outFile.length()
								+ "Bytes"
								+ "\nFile in archive:"
								+ formatter.format(archiveTime)
								+ ", "
								+ archiveLen
								+ "Bytes"
								+ "\n\nWould you like to overwrite the file?";

						int result =
							JOptionPane.showOptionDialog(
								ZipSelfExtractor.this,
								msg,
								"Warning",
								JOptionPane.DEFAULT_OPTION,
								JOptionPane.WARNING_MESSAGE,
								null,
								options,
								options[0]);

						if (result == 2) // No 
						{
							continue;
						}
						else if (result == 1) //YesToAll 
						{
							overwrite = true;
						}
					}
				}

				File parent = new File(outFile.getParent());
				if (parent != null && !parent.exists())
				{
					parent.mkdirs();
				}

				out = new FileOutputStream(outFile);

				while (true)
				{
					int nRead = in.read(buf, 0, buf.length);
					if (nRead <= 0)
						break;
					out.write(buf, 0, nRead);
				}

				out.close();
				outFile.setLastModified(archiveTime.getTime());
			}

			pm.close();
			zf.close();
			getToolkit().beep();

			JOptionPane.showMessageDialog(
				ZipSelfExtractor.this,
				"Extracted "
					+ extracted
					+ " file"
					+ ((extracted > 1) ? "s" : "")
					+ " from the\n"
					+ zipfile
					+ "\narchive into the\n"
					+ outputDir.getPath()
					+ "\ndirectory.",
				"Zip Self Extractor",
				JOptionPane.INFORMATION_MESSAGE);

		}
		catch (Exception e)
		{
			System.out.println(e);
			if (zf != null)
			{
				try
				{
					zf.close();
				}
				catch (IOException ioe)
				{
					;
				}
			}
			if (out != null)
			{
				try
				{
					out.close();
				}
				catch (IOException ioe)
				{
					;
				}
			}
			if (in != null)
			{
				try
				{
					in.close();
				}
				catch (IOException ioe)
				{
					;
				}
			}
		}
	}
}