我正在测试在 Java 和 C# 之间压缩一些消息传递的可行性。
使用的消息传递范围从小字符串（40 字节）到大字符串（4K）。
我发现 Java GZIP 实现与 dot Net GZIP 实现的输出存在差异。
我猜 dot Net 的标头更大，导致开销很大。我更喜欢 Java 实现，因为它在小字符串上效果更好，并且希望 dot Net 能够实现类似的结果。
输出，Java 版本 1.6.0_10
Text:EncodeDecode
Bytes:(12 bytes)RW5jb2RlRGVjb2Rl <- Base64
Compressed:(29)H4sIAAAAAAAAAHPNS85PSXVJBZEAd9jYdgwAAAA=
Decompressed:(12)RW5jb2RlRGVjb2Rl
Converted:EncodeDecode
Text:EncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecode
Bytes:(120)RW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2Rl
Compressed:(33)H4sIAAAAAAAAAHPNS85PSXVJBZGudGQDAOcKnrd4AAAA
Decompressed:(120)RW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2Rl
Converted:EncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecode
输出，点网 2.0.50727
Text:EncodeDecode
Bytes:(12)RW5jb2RlRGVjb2Rl
Compressed:(128)H4sIAAAAAAAEAO29B2AcSZYlJi9tynt/SvVK1+B0oQiAYBMk2JBAEOzBiM3mkuwdaUcjKasqgcplVmVdZhZAzO2dvPfee++999577733ujudTif33/8/XGZkAWz2zkrayZ4hgKrIHz9+fB8/Ik6X02qWP83x7/8Dd9jYdgwAAAA=
Decompressed:(12)RW5jb2RlRGVjb2Rl
Text:EncodeDecode
Text:EncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecode
Bytes:(120)RW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2Rl
Compressed:(131)H4sIAAAAAAAEAO29B2AcSZYlJi9tynt/SvVK1+B0oQiAYBMk2JBAEOzBiM3mkuwdaUcjKasqgcplVmVdZhZAzO2dvPfee++999577733ujudTif33/8/XGZkAWz2zkrayZ4hgKrIHz9+fB8/Ik6X02qWP83x7w/z9/8H5wqet3gAAAA=
Decompressed:(120)RW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2RlRW5jb2RlRGVjb2Rl
Text:EncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecodeEncodeDecode
如何在 dot Net 端实现更小尺寸的编码？
注意，
Java 实现可以解码 dot Net 实现，而
dot Net 实现可以解码 Java 实现。
Java 代码
@Test
public void testEncodeDecode()
{
final String strTitle = "EncodeDecode";
try
{
debug( "Text:" + strTitle );
byte[] ba = strTitle.getBytes( "UTF-8" );
debug( "Bytes:" + toString( ba ) );
byte[] eba = encode_GZIP( ba );
debug( "Encoded:" + toString( eba ) );
byte[] ba2 = decode_GZIP( eba );
debug( "Decoded:" + toString( ba2 ) );
debug( "Converted:" + new String( ba2, "UTF-8" ) );
}
catch( Exception ex ) { fail( ex ); }
}
@Test
public void testEncodeDecode2()
{
final String strTitle = "EncodeDecode";
try
{
StringBuilder sb = new StringBuilder();
for( int i = 0 ; i < 10 ; i++ ) sb.append( strTitle );
debug( "Text:" + sb.toString() );
byte[] ba = sb.toString().getBytes( ENCODING );
debug( "Bytes:" + toString( ba ) );
byte[] eba = encode_GZIP( ba );
debug( "Encoded:" + toString( eba ) );
byte[] ba2 = decode_GZIP( eba );
debug( "Decoded:" + toString( ba2 ) );
debug( "Converted:" + new String( ba2, ENCODING ) );
}
catch( Exception ex ) { fail( ex ); }
}
private String toString( byte[] ba )
{
return "("+ba.length+")"+Base64.byteArrayToBase64( ba );
}
protected static byte[] encode_GZIP( byte[] baData ) throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ByteArrayInputStream bais = new ByteArrayInputStream( baData );
GZIPOutputStream zos = new GZIPOutputStream( baos );
byte[] baBuf = new byte[ 1024 ];
int nSize;
while( -1 != ( nSize = bais.read( baBuf ) ) )
{
zos.write( baBuf, 0, nSize );
zos.flush();
}
Utilities.closeQuietly( zos );
Utilities.closeQuietly( bais );
return baos.toByteArray();
}
protected static byte[] decode_GZIP( byte[] baData ) throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ByteArrayInputStream bais = new ByteArrayInputStream( baData );
GZIPInputStream zis = new GZIPInputStream( bais );
byte[] baBuf = new byte[ 1024 ];
int nSize;
while( -1 != ( nSize = zis.read( baBuf ) ) )
{
baos.write( baBuf, 0, nSize );
baos.flush();
}
Utilities.closeQuietly( zis );
Utilities.closeQuietly( bais );
return baos.toByteArray();
}
private void debug( Object o ) { System.out.println( o ); }
private void fail( Exception ex )
{
ex.printStackTrace();
Assert.fail( ex.getMessage() );
}
点网代码
[Test]
public void TestJava6()
{
string strData = "EncodeDecode";
Console.WriteLine("Text:" + strData);
byte[] baData = Encoding.UTF8.GetBytes(strData);
Console.WriteLine("Bytes:" + toString(baData));
byte[] ebaData2 = encode_GZIP(baData);
Console.WriteLine("Encoded:" + toString(ebaData2));
byte[] baData2 = decode_GZIP(ebaData2);
Console.WriteLine("Decoded:" + toString(baData2));
Console.WriteLine("Text:" + Encoding.UTF8.GetString(baData2));
}
[Test]
public void TestJava7()
{
string strData = "EncodeDecode";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 10; i++) sb.Append(strData);
Console.WriteLine("Text:" + sb.ToString());
byte[] baData = Encoding.UTF8.GetBytes(sb.ToString());
Console.WriteLine("Bytes:" + toString(baData));
byte[] ebaData2 = encode_GZIP(baData);
Console.WriteLine("Encoded:" + toString(ebaData2));
byte[] baData2 = decode_GZIP(ebaData2);
Console.WriteLine("Decoded:" + toString(baData2));
Console.WriteLine("Text:" + Encoding.UTF8.GetString(baData2));
}
public string toString(byte[] ba)
{
return "(" + ba.Length + ")" + Convert.ToBase64String(ba);
}
protected static byte[] decode_GZIP(byte[] ba)
{
MemoryStream writer = new MemoryStream();
using (GZipStream zis = new GZipStream(new MemoryStream(ba), CompressionMode.Decompress))
{
Utilities.CopyStream(zis, writer);
}
return writer.ToArray();
}
protected static byte[] encode_GZIP(byte[] ba)
{
using (MemoryStream reader = new MemoryStream(ba))
{
MemoryStream writer = new MemoryStream();
using (GZipStream zos = new GZipStream(writer, CompressionMode.Compress))
{
Utilities.CopyStream(reader, zos);
}
return writer.ToArray();
}
}