ziputil.java

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/**
 * 
 */
package javazip.util;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.zip.*;
import java.io.*;

import javazip.base.*;
import javazip.base.FileInfo;

/**
 * 实现zip压缩的类,继承自CompressUtil
 * 
 * @author dragon
 *  
 */
public class ZipUtil extends CompressUtil {
	ZipOutputStream out;

	String comment = "";

	static final int BUFFER = 2048;

	/**
	 * 构造函数
	 *  
	 */
	public void ZipUtil() {
	}

	/**
	 * 实现zip的压缩
	 * 
	 * @see javazip.util.CompressUtil#compressFile(java.util.ArrayList)
	 */
	public void compressFile(ArrayList fileList, String target) {
		try {
			out = new ZipOutputStream(new FileOutputStream(target));
			for (int i = 0; i < fileList.size(); i++) {
				File temp = (File) fileList.get(i);
				zip(out, temp, "");
			}
			out.closeEntry();
			out.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	/**
	 *  
	 */
	public void compressFile(File list[], String target) {
		try {
			out = new ZipOutputStream(new FileOutputStream(target));
			for (int i = 0; i < list.length; i++) {
				File temp = (File) list[i];
				zip(out, temp, "");
			}
			out.closeEntry();
			out.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	/**
	 * 压缩文件和文件夹
	 * 
	 * @param out
	 * @param f
	 * @param target
	 * @throws Exception
	 */
	private void zip(ZipOutputStream out, File f, String base) throws Exception {
		out.setComment(comment);
		if (f.isDirectory()) {
			File[] fl = f.listFiles();
			out.putNextEntry(new ZipEntry(base + "/"));
			base = base.length() == 0 ? "" : base + "/";
			for (int i = 0; i < fl.length; i++) {
				zip(out, fl[i], base + fl[i].getName());
			}
		} else {
			out.putNextEntry(new ZipEntry(base + f.getName()));
			FileInputStream in = new FileInputStream(f);
			int b;
			System.out.println(base);
			while ((b = in.read()) != -1) {
				out.write(b);
			}
			in.close();
		}
	}

	/**
	 * 实现zip的解压缩
	 * 
	 * @see javazip.util.CompressUtil#extractFile(java.lang.String)
	 */
	public void extractFile(String source, String target) {
		try {
			ZipFile zipFile = new ZipFile(source);
			java.util.Enumeration e = zipFile.entries();
			ZipEntry zipEntry = null;
			createDirectory(target, "");
			while (e.hasMoreElements()) {
				zipEntry = (ZipEntry) e.nextElement();
				// System.out.println("unziping " + zipEntry.getName());
				if (zipEntry.isDirectory()) {
					String name = zipEntry.getName();
					name = name.substring(0, name.length() - 1);
					File f = new File(target + File.separator + name);
					f.mkdir();
					// System.out.println("创建目录：" + target + File.separator +
					// name);
				} else {
					String fileName = zipEntry.getName();
					fileName = fileName.replace('\\', '/');
					if (fileName.indexOf("/") != -1) {
						createDirectory(target, fileName.substring(0, fileName
								.lastIndexOf("/")));
						fileName = fileName.substring(
								fileName.lastIndexOf("/") + 1, fileName
										.length());
					}

					File f = new File(target + 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);
					}
					out.close();
					in.close();
				}
			}
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		}

	}

	/**
	 * 实现解压缩的一个子函数
	 * 
	 * @param directory
	 * @param subDirectory
	 */
	private void createDirectory(String directory, String subDirectory) {
		String dir[];
		File fl = new File(directory);
		try {
			if (subDirectory == "" && fl.exists() != true)
				fl.mkdir();
			else if (subDirectory != "") {
				dir = subDirectory.replace('\\', '/').split("/");
				for (int i = 0; i < dir.length; i++) {
					File subFile = new File(directory + File.separator + dir[i]);
					if (subFile.exists() == false)
						subFile.mkdir();
					directory += File.separator + dir[i];
				}
			}
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		}
	}

	public static void main(String args[]) {
		ZipUtil zip = new ZipUtil();
		Long l = zip.getOriginalLength(new File("F:\\j-jni.zip"));
		System.out.println(l.longValue());
		ZipUtil zip2=null;
		zip2=new ZipUtil();
		Long l1=zip2.getOriginalLength(new File("E:\\sfds.zip"));
		System.out.println(l1.longValue());
	}

	/**
	 * 取得注释
	 * 
	 * @return
	 */
	public String getComment() {
		return comment;
	}

	/**
	 * 设置注释
	 * 
	 * @param comment
	 */
	public void setComment(String comment) {
		this.comment = comment;
	}

	/**
	 *  
	 */
	public Long getOriginalLength(File f) {
		long result = 0;
		try {
			ZipFile file = new ZipFile(f);
			if (!f.exists()) {
				return null;
			} else {
				Enumeration jar_files = file.entries();
				while (jar_files.hasMoreElements()) {
					ZipEntry zipEntry=(ZipEntry)jar_files.nextElement();
					result += zipEntry.getSize();
				}
			}
		} catch (Exception e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		return new Long(result);
	}

	/**
	 *  
	 */
	public boolean testFile(File f) {
		int count = 0;
		try {
			ZipEntry zipEntry = null;
			ZipInputStream zis = new ZipInputStream(new FileInputStream(f));
			if (!f.exists()) {
				return false;
			} else {
				while ((zipEntry = zis.getNextEntry()) != null) {
					count++;
				}
			}
		} catch (Exception e) {
			// TODO 自动生成 catch 块
			e.printStackTrace();
		}
		if (count > 0)
			return true;
		else
			return false;
	}
}