java实现zip压缩包

package org.bjit.utils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Enumeration;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;
import org.apache.tools.zip.ZipOutputStream;

public class ZipUtil {

/**
* 功能：压缩成zip
*
* @param zipFilep
*            压缩后的zip文件名
* @param path
*            压缩路径
* @throws java.lang.Exception
*/
public boolean zip(String zipFilep, String path) {
//System.out.println("压缩文件开始.....................");
File zipFile = new File(zipFilep);
try {
if (!zipFile.exists()) {
zipFile.createNewFile();
}
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
zipFile));
write(out, path, "");
out.close();
//System.out.println("压缩文件结束！");
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}

/**
* 功能：写压缩流
*
* @param out
*            压缩输出流
* @param path
*            压缩路径
* @param base
*            压缩式的基础目录
* @throws java.lang.Exception
*/

private void write(ZipOutputStream out, String path, String base)
throws Exception {
File file = new File(path);
if (file.isDirectory()) {// 文件夹，递归
base = base.length() == 0 ? "" : base + File.separator;
File[] tempFiles = file.listFiles();
for (int i = 0; i < tempFiles.length; i++) {
write(out, tempFiles[i].getPath(), base
+ tempFiles[i].getName());
}
} else {// 文件，压缩
byte[] buff = new byte[2048];
int bytesRead = -1;
ZipEntry entry = new ZipEntry(base);
out.putNextEntry(entry);
InputStream in = new BufferedInputStream(new FileInputStream(file));
while (-1 != (bytesRead = in.read(buff, 0, buff.length))) {
out.write(buff, 0, bytesRead);
}
in.close();
out.flush();
}
}

/**
* 功能：解压缩
*
* @param zipFilename
*            zip文件
* @param destPath
*            解压缩路径
* @throws java.lang.Exception
*/
public void unZip(String zipFilename, String destPath) throws Exception {
System.out.println("解压文件开始.....................");
ZipFile zip = new ZipFile(zipFilename, "GB2312");
Enumeration enu = zip.getEntries();// 得到压缩文件夹中的所有文件
while (enu.hasMoreElements()) {
ZipEntry entry = (ZipEntry) enu.nextElement();
String file = destPath + entry.getName();
write(zip, entry, file);
}
System.out.println("解压文件结束！");
}

/**
* 功能：将解压缩之后的文件写入目录
*
* @param zip
*            压缩文件
* @param entry
*            压缩文件实体——压缩文件中的文件
* @param fileLocation
*            解压缩之后的文件路径
* @throws Exception
*/
private void write(ZipFile zip, ZipEntry entry, String file)
throws Exception {
if (entry.isDirectory()) {
File f = new File(file);
f.mkdirs();
} else {
File f = new File(file);
createDir(f);
FileOutputStream fos = new FileOutputStream(f);
byte[] buffer = new byte[8196];
InputStream is = zip.getInputStream(entry);
for (int len = is.read(buffer, 0, buffer.length); len != -1; len = is
.read(buffer, 0, 8196)) {
fos.write(buffer, 0, len);
}
fos.close();
}
}

/**
* 功能：创建目录
*
* @param file
*            文件或目录
*/
private void createDir(File file) {
if (file.isDirectory() && !file.exists()) {
file.mkdirs();
} else {
String path = file.getPath();
int i = path.lastIndexOf(File.separator);
path = path.substring(0, i);
new File(path).mkdirs();
}
}

/**
* 功能：测试样例
*
* @param args
*/
public static void main(String[] args) {
try {
// zip("d:\\upload.zip", "d:\\upload");
// unZip("d:\\upload.zip", "e:\\");
} catch (Exception e) {
e.printStackTrace();
}
}
}