Mega Code Archive
Compress a list of files passed in from command line
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import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipException;
class ZipDemo {
private static final int DEFAULT_BUFFER_SIZE = 4096;
public static final byte[] compress(final String uncompressed) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
GZIPOutputStream zos = new GZIPOutputStream(baos);
byte[] uncompressedBytes = uncompressed.getBytes();
zos.write(uncompressedBytes, 0, uncompressedBytes.length);
zos.close();
return baos.toByteArray();
}
public static final String uncompress(final byte[] compressed) throws IOException {
String uncompressed = "";
try {
ByteArrayInputStream bais = new ByteArrayInputStream(compressed);
GZIPInputStream zis = new GZIPInputStream(bais);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int numBytesRead = 0;
byte[] tempBytes = new byte[DEFAULT_BUFFER_SIZE];
while ((numBytesRead = zis.read(tempBytes, 0, tempBytes.length)) != -1) {
baos.write(tempBytes, 0, numBytesRead);
}
uncompressed = new String(baos.toByteArray());
} catch (ZipException e) {
e.printStackTrace(System.err);
}
return uncompressed;
}
public static final String uncompress(final String compressed) throws IOException {
return ZipDemo.uncompress(compressed.getBytes());
}
public static void main(String[] args) throws Exception{
for (int i = 0; i < args.length; ++i) {
String uncompressed = "";
File f = new File(args[i]);
if (f.exists()) {
BufferedReader br = new BufferedReader(new FileReader(f));
String line = "";
StringBuffer buffer = new StringBuffer();
while ((line = br.readLine()) != null)
buffer.append(line);
br.close();
uncompressed = buffer.toString();
} else {
uncompressed = args[i];
}
byte[] compressed = ZipDemo.compress(uncompressed);
String compressedAsString = new String(compressed);
byte[] bytesFromCompressedAsString = compressedAsString.getBytes();
bytesFromCompressedAsString.equals(compressed);
System.out.println(ZipDemo.uncompress(compressed));
System.out.println(ZipDemo.uncompress(compressedAsString));
}
}
}
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