Java实现文件压缩使用GZIP和Zip方式http://blog.csdn.net/kevin_luan/article/details/7903400

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package com.lss.common.file.zip;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
/**
* @description 压缩文件
* @author SHOUSHEN LUAN
* @DATE 2012-1-8下午03:10:01
*/
public class GZipUtils {
public static void main(String[] args) throws IOException {
zipFile("D:\\test\\kevin.mp4", "D:\\test\\kevin.mp4.zip");
unZipFile("D:\\test\\kevin.mp4.zip", "D:\\test\\kevin.mp4.zip.mp4");
}
/**
* Member cache 文件解压处理
*
* @param buf
* @return
* @throws IOException
*/
public static byte[] unGzip(byte[] buf) throws IOException {
GZIPInputStream gzi = null;
ByteArrayOutputStream bos = null;
try {
gzi = new GZIPInputStream(new ByteArrayInputStream(buf));
bos = new ByteArrayOutputStream(buf.length);
int count = 0;
byte[] tmp = new byte[2048];
while ((count = gzi.read(tmp)) != -1) {
bos.write(tmp, 0, count);
}
buf = bos.toByteArray();
} finally {
if (bos != null) {
bos.flush();
bos.close();
}
if (gzi != null)
gzi.close();
}
return buf;
}
/**
* Member cache 文件压缩处理
*
* @param val
* @return
* @throws IOException
*/
public static byte[] gzip(byte[] val) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream(val.length);
GZIPOutputStream gos = null;
try {
gos = new GZIPOutputStream(bos);
gos.write(val, 0, val.length);
gos.finish();
gos.flush();
bos.flush();
val = bos.toByteArray();
} finally {
if (gos != null)
gos.close();
if (bos != null)
bos.close();
}
return val;
}
/**
* 对文件进行压缩
*
* @param source
* 源文件
* @param target
* 目标文件
* @throws IOException
*/
public static void zipFile(String source, String target) throws IOException {
FileInputStream fin = null;
FileOutputStream fout = null;
GZIPOutputStream gzout = null;
try {
fin = new FileInputStream(source);
fout = new FileOutputStream(target);
gzout = new GZIPOutputStream(fout);
byte[] buf = new byte[1024];
int num;
while ((num = fin.read(buf)) != -1) {
gzout.write(buf, 0, num);
}
} finally {
if (gzout != null)
gzout.close();
if (fout != null)
fout.close();
if (fin != null)
fin.close();
}
}
/**
* 解压文件
*
* @param source源文件
* @param target目标文件
* @throws IOException
*/
public static void unZipFile(String source, String target)
throws IOException {
FileInputStream fin = null;
GZIPInputStream gzin = null;
FileOutputStream fout = null;
try {
fin = new FileInputStream(source);
gzin = new GZIPInputStream(fin);
fout = new FileOutputStream(target);
byte[] buf = new byte[1024];
int num;
while ((num = gzin.read(buf, 0, buf.length)) != -1) {
fout.write(buf, 0, num);
}
} finally {
if (fout != null)
fout.close();
if (gzin != null)
gzin.close();
if (fin != null)
fin.close();
}
}
}
package com.lss.common.file.zip;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
@SuppressWarnings("unchecked")
public class ZipToFile {
public static final String ZIP_FILENAME = "D:\\test\\source.zip";// 需要解压缩的文件名
public static final String ZIP_DIR = "D:\\test\\source\\";// 需要压缩的文件夹
public static final String UN_ZIP_DIR = "D:\\test\\";// 要解压的文件目录
public static final int BUFFER = 1024;// 缓存大小
public static void main(String[] args) {
try {
// zipFile(ZIP_DIR,ZIP_FILENAME);
unZipFile();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* zip压缩功能. 压缩baseDir(文件夹目录)下所有文件，包括子目录
*
* @throws Exception
*/
public static void zipFile(String baseDir, String fileName)
throws Exception {
List fileList = getSubFiles(new File(baseDir));
ZipOutputStream zos = new ZipOutputStream(
new FileOutputStream(fileName));
ZipEntry ze = null;
byte[] buf = new byte[BUFFER];
int readLen = 0;
for (int i = 0; i < fileList.size(); i++) {
File f = (File) fileList.get(i);
ze = new ZipEntry(getAbsFileName(baseDir, f));
ze.setSize(f.length());
ze.setTime(f.lastModified());
zos.putNextEntry(ze);
InputStream is = new BufferedInputStream(new FileInputStream(f));
while ((readLen = is.read(buf, 0, BUFFER)) != -1) {
zos.write(buf, 0, readLen);
}
is.close();
}
zos.close();
}
/**
* 给定根目录，返回另一个文件名的相对路径，用于zip文件中的路径.
*
* @param baseDir
* java.lang.String 根目录
* @param realFileName
* java.io.File 实际的文件名
* @return 相对文件名
*/
private static String getAbsFileName(String baseDir, File realFileName) {
File real = realFileName;
File base = new File(baseDir);
String ret = real.getName();
while (true) {
real = real.getParentFile();
if (real == null)
break;
if (real.equals(base))
break;
else
ret = real.getName() + "/" + ret;
}
return ret;
}
/**
* 取得指定目录下的所有文件列表，包括子目录.
*
* @param baseDir
* File 指定的目录
* @return 包含java.io.File的List
*/
private static List getSubFiles(File baseDir) {
List ret = new ArrayList();
File[] tmp = baseDir.listFiles();
for (int i = 0; i < tmp.length; i++) {
if (tmp[i].isFile())
ret.add(tmp[i]);
if (tmp[i].isDirectory())
ret.addAll(getSubFiles(tmp[i]));
}
return ret;
}
/**
* 解压缩功能. 将ZIP_FILENAME文件解压到ZIP_DIR目录下.
*
* @throws Exception
*/
public static void unZipFile() throws Exception {
ZipFile zfile = new ZipFile(ZIP_FILENAME);
Enumeration zList = zfile.entries();
ZipEntry ze = null;
byte[] buf = new byte[1024];
while (zList.hasMoreElements()) {
ze = (ZipEntry) zList.nextElement();
if (ze.isDirectory()) {
File f = new File(ZIP_DIR + ze.getName());
f.mkdir();
continue;
}
OutputStream os = new BufferedOutputStream(new FileOutputStream(
getRealFileName(ZIP_DIR, ze.getName())));
InputStream is = new BufferedInputStream(zfile.getInputStream(ze));
int readLen = 0;
while ((readLen = is.read(buf, 0, 1024)) != -1) {
os.write(buf, 0, readLen);
}
is.close();
os.close();
}
zfile.close();
}
/**
* 给定根目录，返回一个相对路径所对应的实际文件名.
*
* @param baseDir
* 指定根目录
* @param absFileName
* 相对路径名，来自于ZipEntry中的name
* @return java.io.File 实际的文件
*/
public static File getRealFileName(String baseDir, String absFileName) {
String[] dirs = absFileName.split("/");
File ret = new File(baseDir);
if (dirs.length > 1) {
for (int i = 0; i < dirs.length - 1; i++) {
ret = new File(ret, dirs[i]);
}
if (!ret.exists())
ret.mkdirs();
ret = new File(ret, dirs[dirs.length - 1]);
return ret;
}
return ret;
}
}

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Java实现文件压缩 使用GZIP和Zip方式http://blog.csdn.net/kevin_luan/article/details/7903400

Java实现文件压缩使用GZIP和Zip方式http://blog.csdn.net/kevin_luan/article/details/7903400