java解压rar5 兼容rar4

才发现java库没有对rar5压缩算法实现，网上找了一大堆资料，基本都是调用命令的方式，要集成到项目里是很麻烦的，所以一直奔着java解压rar5的目标去找，终于在github上找到了已经实现好的库，希望能帮到大家。

这个库实际是github官方自己实现的，估计是内部项目需要。

按照我下面的步骤就轻松可以完成：

1.pom中添加以下依赖：

<!-- https://mvnrepository.com/artifact/com.github.axet/java-unrar --><dependency><groupId>com.github.axet</groupId><artifactId>java-unrar</artifactId><version>1.7.0-8</version></dependency><dependency><groupId>net.sf.sevenzipjbinding</groupId><artifactId>sevenzipjbinding</artifactId><version>16.02-2.01</version></dependency><dependency><groupId>net.sf.sevenzipjbinding</groupId><artifactId>sevenzipjbinding-all-platforms</artifactId><version>16.02-2.01</version></dependency>

2.java中解压rar5文件的例子：

package rar5;import java.io.IOException;
import java.io.RandomAccessFile;import net.sf.sevenzipjbinding.IInArchive;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;public class RAR5Test {public static void main(String[] args) throws IOException {String rarDir = "D:\\keys\\rar5.rar";String outDir = "D:\\keys\\rar5";RandomAccessFile randomAccessFile = null;IInArchive inArchive = null;// 第一个参数是需要解压的压缩包路径，第二个参数参考JdkAPI文档的RandomAccessFilerandomAccessFile = new RandomAccessFile(rarDir, "r");inArchive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));int[] in = new int[inArchive.getNumberOfItems()];for (int i = 0; i < in.length; i++) {in[i] = i;}inArchive.extract(in, false, new ExtractCallback(inArchive, "366", outDir));}
}

3.自己编写回调ExtractCallback

package rar5;import net.sf.sevenzipjbinding.*;import java.io.*;public class ExtractCallback implements IArchiveExtractCallback {private int index;private String packageName;private IInArchive inArchive;private String ourDir;public ExtractCallback(IInArchive inArchive, String packageName, String ourDir) {this.inArchive = inArchive;this.packageName = packageName;this.ourDir = ourDir;}@Overridepublic void setCompleted(long arg0) throws SevenZipException {}@Overridepublic void setTotal(long arg0) throws SevenZipException {}@Overridepublic ISequentialOutStream getStream(int index, ExtractAskMode extractAskMode) throws SevenZipException {this.index = index;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(byte[] data) throws SevenZipException {try {if (!isFolder) {System.out.println(path);File file = new File(ourDir + path);save2File(file, data);}} catch (Exception e) {e.printStackTrace();}return data.length;}};}@Overridepublic void prepareOperation(ExtractAskMode arg0) throws SevenZipException {}@Overridepublic void setOperationResult(ExtractOperationResult extractOperationResult) throws SevenZipException {String path = (String) inArchive.getProperty(index, PropID.PATH);boolean isFolder = (boolean) inArchive.getProperty(index, PropID.IS_FOLDER);
//        if(ZipUtils.checkOnlyGetDir(path) && !isFolder){
//            if (extractOperationResult != ExtractOperationResult.OK) {
//                StringBuilder sb = new StringBuilder();
//                sb.append("解压").append(packageName).append("包的").append(path).append("文件");
//                sb.append("失败！");
//                log.error(sb.toString());
//            }
//        }}public static boolean save2File(File file, byte[] msg) {OutputStream fos = null;try {File parent = file.getParentFile();boolean bool;if ((!parent.exists()) && (!parent.mkdirs())) {return false;}fos = new FileOutputStream(file);fos.write(msg);fos.flush();return true;} catch (FileNotFoundException e) {return false;} catch (IOException e) {File parent;return false;} finally {if (fos != null) {try {fos.close();} catch (IOException e) {}}}}}

好了，就这么简单。

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