FileSystem and Screen lib realization

filesystem/src/main/java/UnzipUtility.java

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