如何使用与.Net兼容的GZIPOutputStream对字符串进行压缩和解压缩？
如何使用与.Net兼容的GZIPOutputStream对字符串进行压缩和解压缩？
提问于 2011-07-16 19:54:57
我需要一个在安卓系统中使用GZip压缩字符串的例子。我想向该方法发送一个类似"hello“的字符串，并获得以下压缩字符串：
BQAAAB+LCAAAAAAABADtvQdgHEmWJSYvbcp7f0r1StfgdKEIgGATJNiQQBDswYjN5pLsHWlHIymrKoHKZVZlXWYWQMztnbz33nvvvffee++997o7nU4n99//P1xmZAFs9s5K2smeIYCqyB8/fnwfPyLmeVlW/w+GphA2BQAAAA==
然后我需要解压它。谁能给我举个例子，完成下面的方法？
private String compressString(String input) {
//...
}
private String decompressString(String input) {
//...
}谢谢,
更新
根据scessor's answer的说法，我现在有以下4种方法。Android和.net的压缩和解压缩方法。除了一种情况外，这些方法彼此兼容。我的意思是它们在前3个状态下是兼容的，但在第4个状态下是不兼容的：
非状态状态1) (OK)
- state <-> Android.decompress：(OK)
- state 2) Net.compress <-> Net.decompress: OK)
3)
- Net.compress -> Android.decompress：(OK)
- state 4) Android.compress -> .Net.decompress：(NOT state
有人能解决这个问题吗？
安卓方法：
public static String compress(String str) throws IOException {
byte[] blockcopy = ByteBuffer
.allocate(4)
.order(java.nio.ByteOrder.LITTLE_ENDIAN)
.putInt(str.length())
.array();
ByteArrayOutputStream os = new ByteArrayOutputStream(str.length());
GZIPOutputStream gos = new GZIPOutputStream(os);
gos.write(str.getBytes());
gos.close();
os.close();
byte[] compressed = new byte[4 + os.toByteArray().length];
System.arraycopy(blockcopy, 0, compressed, 0, 4);
System.arraycopy(os.toByteArray(), 0, compressed, 4,
os.toByteArray().length);
return Base64.encode(compressed);
}
public static String decompress(String zipText) throws IOException {
byte[] compressed = Base64.decode(zipText);
if (compressed.length > 4)
{
GZIPInputStream gzipInputStream = new GZIPInputStream(
new ByteArrayInputStream(compressed, 4,
compressed.length - 4));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for (int value = 0; value != -1;) {
value = gzipInputStream.read();
if (value != -1) {
baos.write(value);
}
}
gzipInputStream.close();
baos.close();
String sReturn = new String(baos.toByteArray(), "UTF-8");
return sReturn;
}
else
{
return "";
}
}.Net方法：
public static string compress(string text)
{
byte[] buffer = Encoding.UTF8.GetBytes(text);
MemoryStream ms = new MemoryStream();
using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true))
{
zip.Write(buffer, 0, buffer.Length);
}
ms.Position = 0;
MemoryStream outStream = new MemoryStream();
byte[] compressed = new byte[ms.Length];
ms.Read(compressed, 0, compressed.Length);
byte[] gzBuffer = new byte[compressed.Length + 4];
System.Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);
System.Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4);
return Convert.ToBase64String(gzBuffer);
}
public static string decompress(string compressedText)
{
byte[] gzBuffer = Convert.FromBase64String(compressedText);
using (MemoryStream ms = new MemoryStream())
{
int msgLength = BitConverter.ToInt32(gzBuffer, 0);
ms.Write(gzBuffer, 4, gzBuffer.Length - 4);
byte[] buffer = new byte[msgLength];
ms.Position = 0;
using (GZipStream zip = new GZipStream(ms, CompressionMode.Decompress))
{
zip.Read(buffer, 0, buffer.Length);
}
return Encoding.UTF8.GetString(buffer);
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/6717165
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