java z文件解压密码_使用apache compress/org.tukaani.xz在java中解压缩/解密密码保护（AES 256）7z文件的问题...

获取org.tukaani.xz.CorruptedInputException：压缩数据已损坏尝试解密密码保护时出错(AES 256)7z文件。而没有密码保护的7z文件解压没有任何问题。这两种情况相同的xls文件被压缩。使用apache compress/org.tukaani.xz在java中解压缩/解密密码保护(AES 256)7z文件的问题

我使用Apache commons compress和org.tukaani.xz。

示例代码以供参考。

package com.concept.utilities.zip;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.lang.reflect.Field;

import org.apache.commons.compress.archivers.sevenz.SevenZArchiveEntry;

import org.apache.commons.compress.archivers.sevenz.SevenZFile;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.Workbook;

public class DecryptionUtil {

static {

try {

Field field = Class.forName("javax.crypto.JceSecurity").getDeclaredField("isRestricted");

field.setAccessible(true);

field.set(null, java.lang.Boolean.FALSE);

} catch (Exception ex) {

}

}

public void SevenZFile(String directory, String encryptCompressFileName, String password) {

SevenZFile sevenZFile = null;

SevenZArchiveEntry entry = null;

try {

File file = new File(directory+encryptCompressFileName);

byte[] inputData = new byte[(int) file.length()];

FileInputStream fis = new FileInputStream(file);

fis.read(inputData);

fis.close();

// SeekableInMemoryByteChannel inMemoryByteChannel = new SeekableInMemoryByteChannel(inputData);

if(null != password){

byte[] pass = password.getBytes("UTF16");

sevenZFile = new SevenZFile(file, pass);

}else{

sevenZFile = new SevenZFile(file);

}

// Go through all entries

while (null != (entry = sevenZFile.getNextEntry())) {

// Maybe filter by name. Name can contain a path.

String processingFileName = entry.getName();

if (entry.isDirectory()) {

System.out.println(String.format("Found directory entry %s", processingFileName));

} else {

// If this is a file, we read the file content into a ByteArrayOutputStream ...

System.out.println(String.format("Unpacking start %s ...", processingFileName));

ByteArrayOutputStream contentBytes = new ByteArrayOutputStream();

// ... using a small buffer byte array.

byte[] buffer = new byte[2048];

int bytesRead;

while ((bytesRead = sevenZFile.read(buffer)) != -1) {

contentBytes.write(buffer, 0, bytesRead);

}

if (processingFileName.endsWith("xls")) {

// Writing into xls

Workbook wb = new HSSFWorkbook();

//String safeName = WorkbookUtil.createSafeSheetName(processingFileName);

//Sheet sheet = wb.createSheet(safeName);

FileOutputStream fileOut = new FileOutputStream(directory+processingFileName);

fileOut.write(contentBytes.toByteArray());

fileOut.flush();

wb.write(fileOut);

fileOut.close();

wb.close();

}else{ //regular file

System.out.println(contentBytes.toString("UTF-8"));

}

System.out.println(String.format("Unpacking finish %s ...", processingFileName));

}

}

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

sevenZFile.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

public static void main(String[] args) {

DecryptionUtil decrypt = new DecryptionUtil();

decrypt.SevenZFile("H:\\archives\\", "StudentsWoPassword.7z", null);

decrypt.SevenZFile("H:\\archives\\", "StudentsWithPassAES256.7z", "test");

}

}

StudentsWoPassword.7z成功解压但StudentsWithPassAES256.7z抛出异常。

Unpacking start Students.xls ...

Unpacking finish Students.xls ...

org.tukaani.xz.CorruptedInputException: Compressed data is corrupt

at org.tukaani.xz.rangecoder.RangeDecoderFromStream.(Unknown Source)

at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)

at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)

at org.tukaani.xz.LZMAInputStream.(Unknown Source)

at org.apache.commons.compress.archivers.sevenz.LZMADecoder.decode(LZMADecoder.java:43)

at org.apache.commons.compress.archivers.sevenz.Coders.addDecoder(Coders.java:76)

at org.apache.commons.compress.archivers.sevenz.SevenZFile.buildDecoderStack(SevenZFile.java:933)

at org.apache.commons.compress.archivers.sevenz.SevenZFile.buildDecodingStream(SevenZFile.java:909)

at org.apache.commons.compress.archivers.sevenz.SevenZFile.getNextEntry(SevenZFile.java:222)

at com.concept.utilities.zip.DecryptionUtil.SevenZFile(DecryptionUtil.java:50)

at com.concept.utilities.zip.DecryptionUtil.main(DecryptionUtil.java:107)

我错过了什么吗？有没有其他方法可以提取AES256 7z？

2017-07-19

Raj

+0

如果您使用“UTF-16LE”作为编码，它会工作吗？编码时UTF16使用大端字节顺序，'SevenZFile'预计小端。 –

+0

谢谢Stefan。更改为“UTF-16LE”后。它的工作原理 –

+0

所以让我们来回答这个问题:-) –