zip格式，文件的压缩与解压
package com.ky.fuse.report.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
public class ZipUtil {
/**
* 设置缓冲值
*/
static final int BUFFER = 8192;
private static final String ALGORITHM = "PBEWithMD5AndDES";
public static void zip(String zipFileName, String inputFile, String pwd)
throws Exception {
zip(zipFileName, new File(inputFile), pwd);
}
/**
*
* 功能描述：压缩指定路径下的所有文件
* @param zipFileName 压缩文件名(带有路径)
* @param inputFile 指定压缩文件夹
* @return
* @throws Exception
*/
public static void zip(String zipFileName, String inputFile)
throws Exception {
zip(zipFileName, new File(inputFile), null);
}
/**
* 功能描述：压缩文件对象
* @param zipFileName 压缩文件名(带有路径)
* @param inputFile 文件对象
* @return
* @throws Exception
*/
public static void zip(String zipFileName, File inputFile, String pwd)
throws Exception {
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
zipFileName));
zip(out, inputFile, "", pwd);
out.close();
}
/**
* @param out 压缩输出流对象
* @param file
* @param base
* @throws Exception
*
*/
public static void zip(ZipOutputStream outputStream, File file,
String base, String pwd) throws Exception {
if (file.isDirectory()) {
File[] fl = file.listFiles();
outputStream.putNextEntry(new ZipEntry(base + "/"));
base = base.length() == 0 ? "" : base + "/";
for (int i = 0; i < fl.length; i++) {
zip(outputStream, fl[i], base + fl[i].getName(), pwd);
}
} else {
outputStream.putNextEntry(new ZipEntry(base));
FileInputStream inputStream = new FileInputStream(file);
// 普通压缩文件
if (pwd == null || pwd.trim().equals("")) {
int b;
while ((b = inputStream.read()) != -1) {
outputStream.write(b);
}
inputStream.close();
}
// 给压缩文件加密
else {
PBEKeySpec keySpec = new PBEKeySpec(pwd.toCharArray());
SecretKeyFactory keyFactory = SecretKeyFactory
.getInstance(ALGORITHM);
SecretKey passwordKey = keyFactory.generateSecret(keySpec);
byte[] salt = new byte[8];
Random rnd = new Random();
rnd.nextBytes(salt);
int iterations = 100;
PBEParameterSpec parameterSpec = new PBEParameterSpec(salt,
iterations);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, passwordKey, parameterSpec);
outputStream.write(salt);
byte[] input = new byte[64];
int bytesRead;
while ((bytesRead = inputStream.read(input)) != -1) {
byte[] output = cipher.update(input, 0, bytesRead);
if (output != null) {
outputStream.write(output);
}
}
byte[] output = cipher.doFinal();
if (output != null) {
outputStream.write(output);
}
inputStream.close();
outputStream.flush();
outputStream.close();
}
}
//file.delete();
}
public static void unzip(String zipFileName, String outputDirectory)
throws Exception {
ZipInputStream inputStream = new ZipInputStream(new FileInputStream(
zipFileName));
unzip(inputStream, outputDirectory, null);
}
/**
* 功能描述：将压缩文件解压到指定的文件目录下
* @param zipFileName 压缩文件名称(带路径)
* @param
* outputDirectory 指定解压目录
* @return
* @throws Exception
*/
public static void unzip(String zipFileName, String outputDirectory,
String pwd) throws Exception {
ZipInputStream inputStream = new ZipInputStream(new FileInputStream(
zipFileName));
unzip(inputStream, outputDirectory, pwd);
}
public static void unzip(File zipFile, String outputDirectory, String pwd)
throws Exception {
ZipInputStream inputStream = new ZipInputStream(new FileInputStream(
zipFile));
unzip(inputStream, outputDirectory, pwd);
}
public static void unzip(ZipInputStream inputStream,
String outputDirectory, String pwd) throws Exception {
ZipEntry zipEntry = null;
FileOutputStream outputStream = null;
try {
while ((zipEntry = inputStream.getNextEntry()) != null) {
if (zipEntry.isDirectory()) {
String name = zipEntry.getName();
name = name.substring(0, name.length() - 1);
File file = new File(outputDirectory + File.separator
+ name);
file.mkdir();
} else {
File file = new File(outputDirectory + File.separator
+ zipEntry.getName());
file.createNewFile();
outputStream = new FileOutputStream(file);
// 普通解压缩文件
if (pwd == null || pwd.trim().equals("")) {
int b;
while ((b = inputStream.read()) != -1) {
outputStream.write(b);
}
outputStream.close();
}
// 解压缩加密文件
else {
PBEKeySpec keySpec = new PBEKeySpec(pwd.toCharArray());
SecretKeyFactory keyFactory = SecretKeyFactory
.getInstance(ALGORITHM);
SecretKey passwordKey = keyFactory
.generateSecret(keySpec);
byte[] salt = new byte[8];
inputStream.read(salt);
int iterations = 100;
PBEParameterSpec parameterSpec = new PBEParameterSpec(
salt, iterations);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, passwordKey,
parameterSpec);
byte[] input = new byte[64];
int bytesRead;
while ((bytesRead = inputStream.read(input)) != -1) {
byte[] output = cipher.update(input, 0, bytesRead);
if (output != null) {
outputStream.write(output);
}
}
byte[] output = cipher.doFinal();
if (output != null) {
outputStream.write(output);
}
outputStream.flush();
outputStream.close();
}
}
}
inputStream.close();
} catch (IOException ex) {
throw new Exception("解压读取文件失败");
} catch (Exception ex) {
throw new Exception("解压文件密码不正确");
} finally {
inputStream.close();
outputStream.flush();
outputStream.close();
}
}
public static void main(String args[]){
try {
ZipUtil.zip("E:\\222\\111.zip", new File("E:\\111\\"),null);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}