JAVA压缩与解压缩--zip
通过java打zip包或者解压zip包，没什么特别的，jdk已经提供了API。
一。批量文件打压缩与解压缩，打好的zip包可以使用winrar进行解压
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import com.netqin.servlet.CommonServlet;
//import org.apache.tools.zip.ZipEntry;
//import org.apache.tools.zip.ZipOutputStream;
/** 注释乱码。 经过反复测试，发现中文支持有问题。
* google了一下解决方案，用ant包中的两个类 //import org.apache.tools.zip.ZipEntry； //import org.apache.tools.zip.ZipOutputStream；
* 替换Java包的对应的两个类 import java.util.zip.ZipFile； import java.util.zip.ZipOutputStream； 即可完美支持中文。
*/
/** * Java版的Zip工具 * */
public class ZipTool {
private static final int BUFF_SIZE = 1024 * 1024; // 1M Byte
/**
* * 批量压缩文件（夹） *
* * @param resFileList 要压缩的文件（夹）列表
* * @param zipFile 生成的压缩文件
* * @throws
* IOException 当压缩过程出错时抛出
*/
public static void zipFiles(List<File> resFileList, File zipFile)
throws IOException {
ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(
new FileOutputStream(zipFile), BUFF_SIZE));
for (File resFile : resFileList) {
zipFile(resFile, zipout, "");
}
zipout.close();
}
/**
* * 批量压缩文件（夹） *
* * @param resFileList 要压缩的文件（夹）列表
* * @param zipFile 生成的压缩文件
* * @param comment 压缩文件的注释
* * @throws IOException 当压缩过程出错时抛出
*/
public static void zipFiles(List<File> resFileList, File zipFile,
String comment) throws IOException {
ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(
new FileOutputStream(zipFile), BUFF_SIZE));
for (File resFile : resFileList) {
zipFile(resFile, zipout, "");
}
zipout.setComment(comment);
zipout.close();
}
/**
* 描述 : <将文件写入压缩包中>. <br>
*<p>
* @param resFile
* @param zipout
* @param rootpath
* @throws IOException
*/
private static void zipFile(File resFile, ZipOutputStream zipout,
String rootpath) throws IOException {
rootpath = rootpath
+ (rootpath.trim().length() == 0 ? "" : File.separator)
+ resFile.getName();
if (resFile.isDirectory()) {
File[] fileList = resFile.listFiles();
for (File file : fileList) {
zipFile(file, zipout, rootpath);
}
} else {
byte buffer[] = new byte[BUFF_SIZE];
BufferedInputStream in = new BufferedInputStream(
new FileInputStream(resFile), BUFF_SIZE);
zipout.putNextEntry(new ZipEntry(rootpath));
int realLength;
while ((realLength = in.read(buffer)) != -1) {
zipout.write(buffer, 0, realLength);
}
in.close();
zipout.flush();
zipout.closeEntry();
}
}
/**
* * 解压缩一个文件 *
* * @param zipFile 压缩文件
* * @param folderPath 解压缩的目标目录
* * @throws
* IOException 当压缩过程出错时抛出
*/
@SuppressWarnings("unchecked")
public static void upZipFile(File zipFile, String folderPath)
throws IOException {
ZipFile zf = new ZipFile(zipFile);
for (Enumeration entries = zf.entries(); entries.hasMoreElements();) {
ZipEntry entry = ((ZipEntry) entries.nextElement());
InputStream in = zf.getInputStream(entry);
OutputStream out = new FileOutputStream(folderPath + File.separator
+ entry.getName());
byte buffer[] = new byte[BUFF_SIZE];
int realLength;
while ((realLength = in.read(buffer)) > 0) {
out.write(buffer, 0, realLength);
}
in.close();
out.close();
}
}
public static void main(String[] args) throws IOException {
List resFileList = new ArrayList();
resFileList.add(new File("C:\\new.gif"));
resFileList.add(new File("C:\\HelloWorld.java"));
resFileList.add(new File("C:\\crebas.sql"));
resFileList.add(new File("E:\\log.log"));
resFileList.add(new File("C:\\ooo\\upx\\"));
File zipFile = new File("C:\\txxxt.zip");
ZipUtils.zipFiles(resFileList, zipFile);
}
}
二.流压缩及解压缩
/**
* 描述 : <将流打包到文件>. <br>
*<p>
* @param b 数据流
* @param filename 压缩包文件路径
* @return
* @throws IOException
*/
public static String makeZipFile(byte[] b, String filename)
throws IOException {
File file = new File(filename+".zip");
ZipOutputStream zipout = new ZipOutputStream(new BufferedOutputStream(
new FileOutputStream(file), BUFF_SIZE));
zipout.putNextEntry(new ZipEntry(filename));
zipout.write(b);
zipout.flush();
zipout.closeEntry();
zipout.setComment("");
zipout.close();
return fileNewName;
}
/**
* 描述 : <获得文件的数据流>. <br>
*<p>
* @param filename 文件路径
* @return
* @throws FileNotFoundException
*/
public static byte[] getZipFileByte(String filename)
throws FileNotFoundException {
File file = new File(filename);
byte buffer[] = new byte[BUFF_SIZE];
InputStream stream = null;
byte[] data = null;
try {
if (file.canRead()) {
stream = new FileInputStream(file);
data = new byte[Integer.parseInt(String.valueOf(file.length()))];
stream.read(data);
} else {
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return data;
}
/**
* 描述 : <对数据流进行压缩，并返回压缩后的数据流>. <br>
*<p>
*
* @param b
* @return
*/
public byte[] getZipByte(byte[] b) {
byte[] compressed = null;
ByteArrayOutputStream out = null;
ZipOutputStream zout = null;
try {
out = new ByteArrayOutputStream();
zout = new ZipOutputStream(out);
zout.putNextEntry(new ZipEntry("0"));
zout.write(b);
zout.closeEntry();
compressed = out.toByteArray();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (zout != null) {
try {
zout.close();
} catch (IOException e) {
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
}
}
}
return compressed;
}
/**
* 将压缩后的 byte[] 数据解压缩
*
* @param compressed
* 压缩后的 byte[] 数据
* @return 解压后的字符串
* @throws ClassNotFoundException
*/
public static final byte[] decompress(byte[] compressed) {
if (compressed == null)
return null;
ByteArrayOutputStream out = null;
ByteArrayInputStream in = null;
ZipInputStream zin = null;
byte[] decompressed = null;
try {
out = new ByteArrayOutputStream();
in = new ByteArrayInputStream(compressed);
zin = new ZipInputStream(in);
ZipEntry entry = zin.getNextEntry();
byte[] buffer = new byte[1024];
int offset = -1;
while ((offset = zin.read(buffer)) != -1) {
out.write(buffer, 0, offset);
}
decompressed = out.toByteArray();
} catch (Exception e) {
e.printStackTrace();
decompressed = null;
} finally {
if (zin != null) {
try {
zin.close();
} catch (IOException e) {
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
}
}
}
return decompressed;
}
说明一下，在对流进行压缩时，如果最后没有将流写入到文件里，而是将流直接吐出，这样生成的文件将不能通过winrar进行解压，只能通过java读流的方式解压。