69 lines
2.3 KiB
Java
Executable File
69 lines
2.3 KiB
Java
Executable File
import java.io.*;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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/**
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* This utility extracts files and directories of a standard zip file to
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* a destination directory.
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*
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* @author www.codejava.net
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*/
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public class UnzipUtility {
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/**
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* Size of the buffer to read/write data
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*/
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private static final int BUFFER_SIZE = 4096;
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/**
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* Extracts a zip file specified by the zipFilePath to a directory specified by
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* destDirectory (will be created if does not exists)
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*
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* @param zipFilePath path of the archive
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* @param destDirectory where to extract to
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* @throws IOException
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*/
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public void unzip(String zipFilePath, String destDirectory) throws IOException {
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File destDir = new File(destDirectory);
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if (!destDir.exists()) {
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if (!destDir.mkdir())
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throw new IOException("Unable to create a root directory to unzip the archive");
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}
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ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath));
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ZipEntry entry = zipIn.getNextEntry();
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// iterates over entries in the zip file
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while (entry != null) {
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String filePath = destDirectory + File.separator + entry.getName();
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if (!entry.isDirectory()) {
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// if the entry is a file, extracts it
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extractFile(zipIn, filePath);
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} else {
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// if the entry is a directory, make the directory
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File dir = new File(filePath);
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if (!dir.mkdir()) {
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throw new IOException("Unable to create a directory to unzip the directory");
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}
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}
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zipIn.closeEntry();
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entry = zipIn.getNextEntry();
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}
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zipIn.close();
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}
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/**
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* Extracts a zip entry (file entry)
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*
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* @param zipIn ZipInputStream
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* @param filePath Where to extract to
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* @throws IOException
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*/
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private void extractFile(ZipInputStream zipIn, String filePath) throws IOException {
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BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));
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byte[] bytesIn = new byte[BUFFER_SIZE];
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int read;
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while ((read = zipIn.read(bytesIn)) != -1) {
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bos.write(bytesIn, 0, read);
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}
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bos.close();
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}
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} |