How to decompress jar

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Decompress jarpackage com.wuxiongwei.java.jar2;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.nio.ByteBuffer;import java.nio.channels.Channels;import java.nio.channels.FileChannel;import java.nio.channels.ReadableByteChannel;import java.util.Enumeration;import java.util.jar.JarEntry;import java.util.jar.JarFile / * very good tool class

* decompress jar. * @ author * @ version 1.0.0 * / public class JarDecompression {protected static Log log = LogFactory.getLog (JarDecompression.class); @ SuppressWarnings ("resource") public static void uncompress (File jarFile, File tarDir) throws IOException {JarFile jfInst = new JarFile (jarFile); Enumeration enumEntry = jfInst.entries (); while (enumEntry.hasMoreElements ()) {JarEntry jarEntry = (JarEntry) enumEntry.nextElement () File tarFile = new File (tarDir, jarEntry.getName ()); if (jarEntry.getName (). Contains ("META-INF")) {File miFile = new File (tarDir, "META-INF"); if (! miFile.exists ()) {miFile.mkdirs ();}} makeFile (jarEntry, tarFile) If (jarEntry.isDirectory ()) {continue;} FileChannel fileChannel = new FileOutputStream (tarFile). GetChannel (); InputStream ins = jfInst.getInputStream (jarEntry); transferStream (ins, fileChannel) }} / * Stream switching operation * @ param ins input stream * @ param channel output stream * / private static void transferStream (InputStream ins, FileChannel channel) {ByteBuffer byteBuffer = ByteBuffer.allocate (1024 * 10); ReadableByteChannel rbcInst = Channels.newChannel (ins) Try {while (- 1! = (rbcInst.read (byteBuffer) {byteBuffer.flip (); channel.write (byteBuffer); byteBuffer.clear ();}} catch (IOException ioe) {ioe.printStackTrace () } finally {if (null! = rbcInst) {try {rbcInst.close ();} catch (IOException e) {e.printStackTrace () }} if (null! = channel) {try {channel.close ();} catch (IOException e) {e.printStackTrace () }} / * print jar file content information * @ param file jar file * / public static void printJarEntry (File file) {JarFile jfInst = null;; try {jfInst = new JarFile (file);} catch (IOException e) {e.printStackTrace () } Enumeration enumEntry = jfInst.entries (); while (enumEntry.hasMoreElements ()) {log.info ((enumEntry.nextElement () }} / * create file * @ param jarEntry jar entity * @ param fileInst file entity * @ throws IOException throws an exception * / public static void makeFile (JarEntry jarEntry, File fileInst) {if (! fileInst.exists ()) {if (jarEntry.isDirectory ()) {fileInst.mkdirs () } else {try {fileInst.createNewFile ();} catch (IOException e) {log.error ("failed to create file >" .concat (fileInst.getPath () }} public static void main (String [] args) {File jarFile = new File ("/ Users/mac/Documents/other/bw2/bopsdk-openapi-1.0.2-Release.jar"); File targetDir = new File ("/ Users/mac/Documents/other/bw2/test/"); try {JarDecompression.uncompress (jarFile, targetDir) } catch (IOException e) {e.printStackTrace ();} this is the end of sharing about how to decompress jar. I hope the above content can be helpful to you and learn more. If you think the article is good, you can share it for more people to see.