JAVA文件压缩、解压

ZIP，是一个计算机文件的压缩的算法，原名Deflate（真空），发明者为菲利普·卡兹（Phil Katz)），他于1989年1月公布了该格式的资料。ZIP通常使用后缀名“.zip”，它的MIME格式为 application/zip 。目前，ZIP格式属于几种主流的压缩格式之一，其竞争者包括RAR格式以及开放源码的7-Zip格式。从性能上比较，RAR格式较ZIP格式压缩率较高，但是它的压缩时间远远高于Zip。而7-Zip(7z)由于提供了免费的压缩工具而逐渐在更多的领域得到应用。JAVA中对其也提供了支持，我们可以很方便的对zip文件进行操作。

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

/**
* 文件压缩工具
*
* @author jianggujin
*
*/
public class ZipUtils
{
/**
* 压缩文件
*
* @param zip
*           压缩后文件
* @param path
*           文件夹，为空则不添加文件夹
* @param srcFiles
*           压缩源文件
* @throws IOException
*/
public void zipFiles(File zip, String path, File... srcFiles)
throws IOException
{
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zip));
zipFiles(out, path, srcFiles);
out.close();
}

/**
* 压缩文件
*
* @param out
*           压缩输出流
* @param path
*           文件夹，为空则不添加文件夹
* @param srcFiles
*           压缩源文件
* @throws IOException
*/
public void zipFiles(ZipOutputStream out, String path, File... srcFiles)
throws IOException
{
if (path == null)
{
path = "";
}
path = path.replaceAll("\\*", "/");
if (path.length() > 0 && !path.endsWith("/"))
{
path += "/";
}
byte[] buf = new byte[1024];
for (int i = 0; i < srcFiles.length; i++)
{
if (srcFiles[i].isDirectory())
{
File[] files = srcFiles[i].listFiles();
String srcPath = srcFiles[i].getName();
srcPath = srcPath.replaceAll("\\*", "/");
if (!srcPath.endsWith("/"))
{
srcPath += "/";
}
out.putNextEntry(new ZipEntry(path + srcPath));
zipFiles(out, path + srcPath, files);
}
else
{
FileInputStream in = new FileInputStream(srcFiles[i]);
out.putNextEntry(new ZipEntry(path + srcFiles[i].getName()));
int len;
while ((len = in.read(buf)) > 0)
{
out.write(buf, 0, len);
}
out.closeEntry();
in.close();
}
}
}

/**
* 解压到指定目录
*
* @param zipPath
* @param descDir
* @throws IOException
*/
public void unZipFiles(String zipPath, String descDir) throws IOException
{
unZipFiles(new File(zipPath), new File(descDir), null);
}

/**
* 解压到指定目录
*
* @param zipFile
* @param pathFile
* @throws IOException
*/
public void unZipFiles(File zipFile, File pathFile) throws IOException
{
unZipFiles(zipFile, pathFile, null);
}

/**
* 解压到指定目录
*
* @param zipFile
* @param pathFile
* @param zipList
*           压缩文件内路径集合
* @throws IOException
*/
@SuppressWarnings("rawtypes")
public void unZipFiles(File zipFile, File pathFile, List<String> zipList)
throws IOException
{
if (!pathFile.exists())
{
pathFile.mkdirs();
}
ZipFile zip = new ZipFile(zipFile);
for (Enumeration entries = zip.entries(); entries.hasMoreElements();)
{
ZipEntry entry = (ZipEntry) entries.nextElement();
String zipEntryName = entry.getName();
InputStream in = zip.getInputStream(entry);
String outPath = zipEntryName.replaceAll("\\*", "/");
int index = outPath.lastIndexOf('/');
if (index != -1)
{
File file = new File(pathFile, outPath.substring(0,
outPath.lastIndexOf('/')));
if (!file.exists())
{
file.mkdirs();
}
}
// 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
File realFile = new File(pathFile, outPath);
if (zipList != null)
{
zipList.add(outPath);
}
if (realFile.isDirectory())
{
continue;
}

OutputStream out = new FileOutputStream(realFile);
byte[] buf1 = new byte[1024];
int len;
while ((len = in.read(buf1)) > 0)
{
out.write(buf1, 0, len);
}
in.close();
out.close();
}
}
}