android - 使用 GZIPOutputStream 压缩字符串

Question

我想压缩我的字符串值。这些字符串值应与 .net 压缩字符串相同。

我写了Decompress 方法，当我向它发送一个.net 压缩字符串时，它工作正常。但是 Compress 方法无法正常工作。

public static String Decompress(String zipText) throws IOException {
    int size = 0;
    byte[] gzipBuff = Base64.decode(zipText);

    ByteArrayInputStream memstream = new ByteArrayInputStream(gzipBuff, 4,
            gzipBuff.length - 4);
    GZIPInputStream gzin = new GZIPInputStream(memstream);

    final int buffSize = 8192;
    byte[] tempBuffer = new byte[buffSize];
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    while ((size = gzin.read(tempBuffer, 0, buffSize)) != -1) {
        baos.write(tempBuffer, 0, size);
    }
    byte[] buffer = baos.toByteArray();
    baos.close();

    return new String(buffer, "UTF-8");
}

public static String Compress(String text) throws IOException {
    byte[] gzipBuff = EncodingUtils.getBytes(text, "UTF-8");

    ByteArrayOutputStream bs = new ByteArrayOutputStream();
    GZIPOutputStream gzin = new GZIPOutputStream(bs);

    gzin.write(gzipBuff);
    gzin.finish();
    bs.close();

    byte[] buffer = bs.toByteArray();
    gzin.close();

    return Base64.encode(buffer);
}

For example when I send "BQAAAB+LCAAAAAAABADtvQdgHEmWJSYvbcp7f0r1StfgdKEIgGATJNiQQBDswYjN5pLsHWlHIymrKoHKZVZlXWYWQMztnbz33nvvvffee++997o7nU4n99//P1xmZAFs9s5K2smeIYCqyB8/fnwfPyLmeVlW/w+GphA2BQAAAA==" to Decompress method It returns the string "Hello ”，但是当我向 Compress 方法发送 “Hello” 时，它会返回 “H4sIAAAAAAAAAAMtIzcnJBwCGphA2BQAAAA==”。

Compress 方法有什么问题？？？？

Answer 1

检查 Use Zip Stream and Base64 Encoder to Compress Large String Data

关于如何使用 GZIPOutputStream/GZIInputStream 和 Base64 编码器和解码器来压缩和解压缩大字符串数据，以便在 http 响应中将其作为文本传递。

public static String compressString(String srcTxt) throws IOException {
  ByteArrayOutputStream rstBao = new ByteArrayOutputStream();
  GZIPOutputStream zos = new GZIPOutputStream(rstBao);
  zos.write(srcTxt.getBytes());
  IOUtils.closeQuietly(zos);

  byte[] bytes = rstBao.toByteArray();
  return Base64.encodeBase64String(bytes);
}

或者我们可以使用Use Zip Stream and Base64 Encoder to Compress Large String Data以避免将整个字符串加载到内存中。

public static String uncompressString(String zippedBase64Str) throws IOException {
  String result = null;
  byte[] bytes = Base64.decodeBase64(zippedBase64Str);
  GZIPInputStream zi = null;
  try {
    zi = new GZIPInputStream(new ByteArrayInputStream(bytes));
    result = IOUtils.toString(zi);
  } finally {
    IOUtils.closeQuietly(zi);
  }
    return result;
}