我尝试使用 LZ4 压缩来压缩字符串对象。但结果不利于 LZ4 这是我尝试过的程序
public class CompressionDemo {
public static byte[] compressGZIP(String data) throws IOException {
long start = System.nanoTime ();
ByteArrayOutputStream bos = new ByteArrayOutputStream(data.length());
GZIPOutputStream gzip = new GZIPOutputStream(bos);
gzip.write(data.getBytes());
gzip.close();
byte[] compressed = bos.toByteArray();
bos.close();
System.out.println(System.nanoTime()-start);
return compressed;
}
public static byte[] compressLZ4(String data) throws IOException {
long start = System.nanoTime ();
LZ4Factory factory = LZ4Factory.fastestJavaInstance();
LZ4Compressor compressor = factory.highCompressor();
byte[] result = compressor.compress(data.getBytes());
System.out.println(System.nanoTime()-start);
return result;
}
public static byte[] compressDeflater(String stringToCompress) {
long start = System.nanoTime ();
byte[] returnValues = null;
try {
Deflater deflater = new Deflater(Deflater.BEST_COMPRESSION);
deflater.setInput(stringToCompress.getBytes("UTF-8"));
deflater.finish();
byte[] bytesCompressed = new byte[Short.MAX_VALUE];
int numberOfBytesAfterCompression = deflater.deflate(bytesCompressed);
returnValues = new byte[numberOfBytesAfterCompression];
System.arraycopy(bytesCompressed, 0, returnValues, 0, numberOfBytesAfterCompression);
} catch (Exception uee) {
uee.printStackTrace();
}
System.out.println(System.nanoTime()-start);
return returnValues;
}
public static void main(String[] args) throws IOException, DataFormatException {
System.out
.println("..it’s usually most beneficial to compress anyway, and determine which payload (the compressed or the uncompressed one) has the smallest size and include a small token to indicate whether decompression is required."
.getBytes().length);
byte[] arr = compressLZ4("..it’s usually most beneficial to compress anyway, and determine which payload (the compressed or the uncompressed one) has the smallest size and include a small token to indicate whether decompression is required.");
System.out.println(arr.length);
}
}
我已经收集了上面的静态数据。但是 LZ4 并没有说的那么快请让我在哪里做错了。