Java导入导出7z压缩文件
在日常开发中,我们经常会遇到需要对文件进行压缩和解压缩的需求。而7z是一种常用的高效压缩格式,本文将介绍如何在Java中导入和导出7z压缩文件的方法。
1. 导入依赖
首先,我们需要导入一个Java库来处理7z文件。在这里,我们将使用SevenZipJBinding库。您可以在Maven中添加以下依赖:
<dependency>
<groupId>net.sf.sevenzipjbinding</groupId>
<artifactId>sevenzipjbinding</artifactId>
<version>9.20-2.00</version>
</dependency>
2. 导入7z文件
下面是一个简单的Java方法,用于导入7z文件:
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
import net.sf.sevenzipjbinding.simple.ISimpleInArchive;
import net.sf.sevenzipjbinding.simple.ISimpleInArchiveItem;
import java.io.File;
import java.io.FileInputStream;
public void import7zFile(String filePath) {
try {
File file = new File(filePath);
RandomAccessFileInStream fileInStream = new RandomAccessFileInStream(new FileInputStream(file));
ISimpleInArchive simpleInArchive = SevenZip.openInArchive(null, fileInStream);
for (ISimpleInArchiveItem item : simpleInArchive.getFileSystem().getRootFolder().getItems()) {
// 处理文件
String itemName = item.getPath();
// ...
}
simpleInArchive.close();
fileInStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
3. 导出7z文件
下面是一个简单的Java方法,用于导出7z文件:
import net.sf.sevenzipjbinding.*;
import net.sf.sevenzipjbinding.simple.ISimpleOutArchive;
import net.sf.sevenzipjbinding.simple.ISimpleOutArchiveItem;
import java.io.File;
import java.io.FileOutputStream;
public void export7zFile(String outputPath, String[] files) {
try {
File file = new File(outputPath);
FileOutputStream fileOutStream = new FileOutputStream(file);
OutStreamWrapper outStream = new OutStreamWrapper(fileOutStream);
IOutCreateArchive7z outArchive = SevenZip.openOutArchive7z();
outArchive.createArchive(null, files.length, new IOutCreateCallback<IOutItem7z>() {
@Override
public void setOperationResult(boolean operationResultOk) throws SevenZipException {
}
@Override
public void setTotal(long total) throws SevenZipException {
}
@Override
public void setCompleted(long complete) throws SevenZipException {
}
@Override
public IOutItem7z getItemInformation(int index, IOutItem7z item) {
item.setDataSize(new File(files[index]).length());
item.setPropertyPath(files[index]);
return item;
}
}, outStream);
outArchive.close();
outStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
关系图和类图
erDiagram
IMPORT --|> 7ZFile
EXPORT --|> 7ZFile
classDiagram
IMPORT <|-- SevenZipImporter
EXPORT <|-- SevenZipExporter
结语
通过本文,我们了解了如何在Java中使用SevenZipJBinding库来处理7z文件的导入和导出操作。希望这篇文章对您有所帮助,谢谢阅读!