項目開發中，遇到許多文件操作，特別是壓縮或解壓。大多使用開源的ZIP、7Z方案，已有大量第三方庫可用，在這不多重復。

如果項目中，需要解壓rar文件，相信你會在心里罵千萬遍SB，然后熟練的cmd調用winrar...

本文另辟蹊徑，使用開源的sevenzipjbinding進行rar5文件解壓。（注意：是現流行的rar5,非rar4）

上代碼：

net.sf.sevenzipjbindingsevenzipjbinding16.02-2.01net.sf.sevenzipjbindingsevenzipjbinding-all-platforms16.02-2.01

//隨機 通行 文件，較多用于大文件處理RandomAccessFile randomAccessFile = null;IInArchive inArchive = null;try {//只讀打開文件randomAccessFile = new RandomAccessFile(file, "r");	inArchive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));	final int[] in = new int[inArchive.getNumberOfItems()];	for (int i = 0; i < in.length; i++) {		in[i] = i;	}//savePath輸出路徑	inArchive.extract(in, false, new MyArchiveExtractCallback(inArchive, savePath)); } catch (Exception e) { //記錄或拋出錯誤 } finally {	//別忘了closeable}

MyArchiveExtractCallback:

public class MyArchiveExtractCallback implements IArchiveExtractCallback {	private int index;	private IInArchive inArchive;	private String ourDir;	public MyArchiveExtractCallback(final IInArchive newinArchive, final String newourDir) {		this.inArchive = newinArchive;		this.ourDir = newourDir;	}	/**	 * Return sequential output stream for the file with index index.	 * 詳細請看接口說明	 */	@Override	public ISequentialOutStream getStream(final int newindex, final ExtractAskMode newextractAskMode)			throws SevenZipException {		this.index = newindex;		final String path = (String) inArchive.getProperty(index, PropID.PATH);		final boolean isFolder = (Boolean) inArchive.getProperty(index, PropID.IS_FOLDER);		return new ISequentialOutStream() {			public int write(final byte[] data) throws SevenZipException {				try {					if (!isFolder) {						final File file = new File(ourDir + File.separator + path);						FileUtils.writeByteArrayToFile(file, data);					}				} catch (Exception e) {					e.printStackTrace();				}				return data.length;			}		};	}  	@Override	public void setCompleted(final long arg0) throws SevenZipException {	}	@Override	public void setTotal(final long arg0) throws SevenZipException {	}	@Override	public void prepareOperation(final ExtractAskMode arg0) throws SevenZipException {	}	@Override	public void setOperationResult(final ExtractOperationResult extractOperationResult) throws SevenZipException {	}}

但是很可惜，目前還不支持RAR5的壓縮。官網功能介紹如下：

Extract

7-Zip Zip Rar Tar Split Lzma Iso HFS GZip

Cpio BZip2 Z Arj Chm Lhz Cab Nsis

Ar/A/Lib/Deb Rpm Wim Udf Fat Ntfs

Create/ｕｐｄａｔｅ

7-Zip Zip GZip Tar BZip2

It's cross-platform. Binaries are available for

? MS-Windows 32/64 ? Darwin Mac OS X

? Linux:

Intel 32/64

ARMv5 (armel) *

ARMv6 (RaspberryPi 2) *

ARMv7 (armhf) *

ARM64 *