使用Java.util.zip下的zipOutStream和zipInStream对字节流进行压缩和解压缩
参考：http://www.blogjava.net/usherlight/archive/2007/09/26/148230.html
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网上介绍使用zipInStream和zipOutStream对文件或者文件夹进行压缩和解压缩的文章比较多。
但是这次项目中需要对byte[]进行压缩，然后decode，通过http发送到服务端。
最简单的方法，当然是把byte[]写到文件里，然后根据网上已有的文章，生成fileInputStream，构造zipInStream。
但是这个做法有着明显的问题，需要操作IO，在效率上不可取。
下面是利用ByteArrayOutStream来完成压缩和解压缩的代码。
??? /**
?????*?Answer?a?byte?array?compressed?in?the?Zip?format?from?bytes.
?????*?
?????*?@param?bytes
?????*????????????a?byte?array
?????*?@param?aName
?????*????????????a?String?the?represents?a?file?name
?????*?@return?byte[]?compressed?bytes
?????*?@throws?IOException
?????*/
????public?static?byte[]?zipBytes(byte[]?bytes)?throws?IOException?{
????????ByteArrayOutputStream?tempOStream?=?null;
????????BufferedOutputStream?tempBOStream?=?null;
????????ZipOutputStream?tempZStream?=?null;
????????ZipEntry?tempEntry?=?null;
????????byte[]?tempBytes?=?null;
????????tempOStream?=?new?ByteArrayOutputStream(bytes.length);
????????tempBOStream?=?new?BufferedOutputStream(tempOStream);
????????tempZStream?=?new?ZipOutputStream(tempBOStream);
????????tempEntry?=?new?ZipEntry(String.valueOf(bytes.length));
????????tempEntry.setMethod(ZipEntry.DEFLATED);
????????tempEntry.setSize((long)?bytes.length);
????????
????????tempZStream.putNextEntry(tempEntry);
????????tempZStream.write(bytes,?0,?bytes.length);
????????tempZStream.flush();
????????tempBOStream.flush();
????????tempOStream.flush();
????????tempZStream.close();
????????tempBytes?=?tempOStream.toByteArray();
????????tempOStream.close();
????????tempBOStream.close();
????????return?tempBytes;
????}
????/**
?????*?Answer?a?byte?array?that?has?been?decompressed?from?the?Zip?format.
?????*?
?????*?@param?bytes
?????*????????????a?byte?array?of?compressed?bytes
?????*?@return?byte[]?uncompressed?bytes
?????*?@throws?IOException
?????*/
????public?static?void?unzipBytes(byte[]?bytes,?OutputStream?os)?throws?IOException?{
????????ByteArrayInputStream?tempIStream?=?null;
????????BufferedInputStream?tempBIStream?=?null;
????????ZipInputStream?tempZIStream?=?null;
????????ZipEntry?tempEntry?=?null;
????????long?tempDecompressedSize?=?-1;
????????byte[]?tempUncompressedBuf?=?null;
????????tempIStream?=?new?ByteArrayInputStream(bytes,?0,?bytes.length);
????????tempBIStream?=?new?BufferedInputStream(tempIStream);
????????tempZIStream?=?new?ZipInputStream(tempBIStream);
????????tempEntry?=?tempZIStream.getNextEntry();
????????
????????if?(tempEntry?!=?null)?{
????????????tempDecompressedSize?=?tempEntry.getCompressedSize();
????????????if?(tempDecompressedSize?<?0)?{
????????????????tempDecompressedSize?=?Long.parseLong(tempEntry.getName());
????????????}
????????????int?size?=?(int)tempDecompressedSize;
????????????tempUncompressedBuf?=?new?byte[size];
????????????int?num?=?0,?count?=?0;
????????????while?(?true?)?{
????????????????count?=?tempZIStream.read(tempUncompressedBuf,?0,?size?-?num?);
????????????????num?+=?count;
????????????????os.write(?tempUncompressedBuf,?0,?count?);
????????????????os.flush();
????????????????if?(?num?>=?size?)?break;
????????????}
????????}
????????tempZIStream.close();
????}