java压缩/解压缩zip格式文件

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1package com.resoft.util;

3import java.io.BufferedOutputStream;

4import java.io.File;

5import java.io.FileInputStream;

6import java.io.FileNotFoundException;

7import java.io.FileOutputStream;

8import java.io.IOException;

9import java.io.InputStream;

10import java.io.OutputStream;

11import java.util.Enumeration;

13import org.apache.tools.zip.ZipEntry;

14import org.apache.tools.zip.ZipFile;

15import org.apache.tools.zip.ZipOutputStream;

17/** *//**
* 压缩/解压缩zip包处理类
*
* @author yayagepei
* @date 2008-8-25
*/

23public class ZipUtil {

/** *//**
* 压缩
*
* @param zipFileName
* 压缩产生的zip包文件名--带路径,如果为null或空则默认按文件名生产压缩文件名
* @param relativePath
* 相对路径，默认为空
* @param directory
* 文件或目录的绝对路径
* @throws FileNotFoundException
* @throws IOException
* @author yayagepei
* @date 2008-8-26
*/
public static void zip(String zipFileName, String relativePath,
String directory) throws FileNotFoundException, IOException {
String fileName = zipFileName;
if (fileName == null || fileName.trim().equals("")) {
File temp = new File(directory);
if (temp.isDirectory()) {
fileName = directory + ".zip";
} else {
if (directory.indexOf(".") > 0) {
fileName = directory.substring(0, directory
.lastIndexOf("."))
+ "zip";
} else {
fileName = directory + ".zip";
}
}
}
ZipOutputStream zos = new ZipOutputStream(
new FileOutputStream(fileName));
try {
zip(zos, relativePath, directory);
} catch (IOException ex) {
throw ex;
} finally {
if (null != zos) {
zos.close();
}
}
}

/** *//**
* 压缩
*
* @param zos
* 压缩输出流
* @param relativePath
* 相对路径
* @param absolutPath
* 文件或文件夹绝对路径
* @throws IOException
* @author yayagepei
* @date 2008-8-26
*/
private static void zip(ZipOutputStream zos, String relativePath,
String absolutPath) throws IOException {
File file = new File(absolutPath);
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
File tempFile = files[i];
if (tempFile.isDirectory()) {
String newRelativePath = relativePath + tempFile.getName()
+ File.separator;
createZipNode(zos, newRelativePath);
zip(zos, newRelativePath, tempFile.getPath());
} else {
zipFile(zos, tempFile, relativePath);
}
}
} else {
zipFile(zos, file, relativePath);
}
}

/** *//**
* 压缩文件
*
* @param zos
* 压缩输出流
* @param file
* 文件对象
* @param relativePath
* 相对路径
* @throws IOException
* @author yayagepei
* @date 2008-8-26
*/
private static void zipFile(ZipOutputStream zos, File file,
String relativePath) throws IOException {
ZipEntry entry = new ZipEntry(relativePath + file.getName());
zos.putNextEntry(entry);
InputStream is = null;
try {
is = new FileInputStream(file);
int BUFFERSIZE = 2 << 10;
int length = 0;
byte[] buffer = new byte[BUFFERSIZE];
while ((length = is.read(buffer, 0, BUFFERSIZE)) >= 0) {
zos.write(buffer, 0, length);
}
zos.flush();
zos.closeEntry();
} catch (IOException ex) {
throw ex;
} finally {
if (null != is) {
is.close();
}
}
}

/** *//**
* 创建目录
*
* @param zos
* zip输出流
* @param relativePath
* 相对路径

java压缩/解压缩zip格式文件