公司一个用户数据过大，导致android与服务端通讯速度太慢，通过分析，最小改动方式使用数据压缩，不压缩前数据大概5M压缩后只有20k.
服务端使用gzip压缩。客户端androi使用类解压缩，在网上找了一个工具类如下。解决。
public final class Base64Utils { private static final int BASELENGTH = 128; private static final int LOOKUPLENGTH = 64; private static final int TWENTYFOURBITGROUP = 24; private static final int EIGHTBIT = 8; private static final int SIXTEENBIT = 16; private static final int SIXBIT = 6; private static final int FOURBYTE = 4; private static final int SIGN = -128; private static final char PAD = ‘=‘; private static final boolean fDebug = false; private static final byte[] base64Alphabet = new byte[128]; private static final char[] lookUpBase64Alphabet = new char[64]; public Base64Utils() { } protected static boolean isWhiteSpace(char octect) { return octect == 32 || octect == 13 || octect == 10 || octect == 9; } protected static boolean isPad(char octect) { return octect == 61; } protected static boolean isData(char octect) { return octect < 128 && base64Alphabet[octect] != -1; } protected static boolean isBase64(char octect) { return isWhiteSpace(octect) || isPad(octect) || isData(octect); } public static String encode(byte[] binaryData) { if(binaryData == null) { return null; } else { int lengthDataBits = binaryData.length * 8; if(lengthDataBits == 0) { return ""; } else { int fewerThan24bits = lengthDataBits % 24; int numberTriplets = lengthDataBits / 24; int numberQuartet = fewerThan24bits != 0?numberTriplets + 1:numberTriplets; Object encodedData = null; char[] var17 = new char[numberQuartet * 4]; boolean k = false; boolean l = false; boolean b1 = false; boolean b2 = false; boolean b3 = false; int encodedIndex = 0; int dataIndex = 0; byte val2; byte var18; byte var19; byte var20; byte var21; for(int val1 = 0; val1 < numberTriplets; ++val1) { var20 = binaryData[dataIndex++]; var21 = binaryData[dataIndex++]; byte var22 = binaryData[dataIndex++]; var19 = (byte)(var21 & 15); var18 = (byte)(var20 & 3); val2 = (var20 & -128) == 0?(byte)(var20 >> 2):(byte)(var20 >> 2 ^ 192); byte val21 = (var21 & -128) == 0?(byte)(var21 >> 4):(byte)(var21 >> 4 ^ 240); byte val3 = (var22 & -128) == 0?(byte)(var22 >> 6):(byte)(var22 >> 6 ^ 252); var17[encodedIndex++] = lookUpBase64Alphabet[val2]; var17[encodedIndex++] = lookUpBase64Alphabet[val21 | var18 << 4]; var17[encodedIndex++] = lookUpBase64Alphabet[var19 << 2 | val3]; var17[encodedIndex++] = lookUpBase64Alphabet[var22 & 63]; } byte var23; if(fewerThan24bits == 8) { var20 = binaryData[dataIndex]; var18 = (byte)(var20 & 3); var23 = (var20 & -128) == 0?(byte)(var20 >> 2):(byte)(var20 >> 2 ^ 192); var17[encodedIndex++] = lookUpBase64Alphabet[var23]; var17[encodedIndex++] = lookUpBase64Alphabet[var18 << 4]; var17[encodedIndex++] = 61; var17[encodedIndex++] = 61; } else if(fewerThan24bits == 16) { var20 = binaryData[dataIndex]; var21 = binaryData[dataIndex + 1]; var19 = (byte)(var21 & 15); var18 = (byte)(var20 & 3); var23 = (var20 & -128) == 0?(byte)(var20 >> 2):(byte)(var20 >> 2 ^ 192); val2 = (var21 & -128) == 0?(byte)(var21 >> 4):(byte)(var21 >> 4 ^ 240); var17[encodedIndex++] = lookUpBase64Alphabet[var23]; var17[encodedIndex++] = lookUpBase64Alphabet[val2 | var18 << 4]; var17[encodedIndex++] = lookUpBase64Alphabet[var19 << 2]; var17[encodedIndex++] = 61; } return new String(var17); } } } public static byte[] decode(String encoded) { if(encoded == null) { return null; } else { char[] base64Data = encoded.toCharArray(); int len = removeWhiteSpace(base64Data); if(len % 4 != 0) { return null; } else { int numberQuadruple = len / 4; if(numberQuadruple == 0) { return new byte[0]; } else { Object decodedData = null; boolean b1 = false; boolean b2 = false; boolean b3 = false; boolean b4 = false; boolean d1 = false; boolean d2 = false; boolean d3 = false; boolean d4 = false; int i = 0; int encodedIndex = 0; int dataIndex = 0; byte[] var17; byte var18; byte var19; byte var20; byte var21; char var22; char var23; char var24; char var25; for(var17 = new byte[numberQuadruple * 3]; i < numberQuadruple - 1; ++i) { if(!isData(var22 = base64Data[dataIndex++]) || !isData(var23 = base64Data[dataIndex++]) || !isData(var24 = base64Data[dataIndex++]) || !isData(var25 = base64Data[dataIndex++])) { return null; } var18 = base64Alphabet[var22]; var19 = base64Alphabet[var23]; var20 = base64Alphabet[var24]; var21 = base64Alphabet[var25]; var17[encodedIndex++] = (byte)(var18 << 2 | var19 >> 4); var17[encodedIndex++] = (byte)((var19 & 15) << 4 | var20 >> 2 & 15); var17[encodedIndex++] = (byte)(var20 << 6 | var21); } if(isData(var22 = base64Data[dataIndex++]) && isData(var23 = base64Data[dataIndex++])) { var18 = base64Alphabet[var22]; var19 = base64Alphabet[var23]; var24 = base64Data[dataIndex++]; var25 = base64Data[dataIndex++]; if(isData(var24) && isData(var25)) { var20 = base64Alphabet[var24]; var21 = base64Alphabet[var25]; var17[encodedIndex++] = (byte)(var18 << 2 | var19 >> 4); var17[encodedIndex++] = (byte)((var19 & 15) << 4 | var20 >> 2 & 15); var17[encodedIndex++] = (byte)(var20 << 6 | var21); return var17; } else { byte[] tmp; if(isPad(var24) && isPad(var25)) { if((var19 & 15) != 0) { return null; } else { tmp = new byte[i * 3 + 1]; System.arraycopy(var17, 0, tmp, 0, i * 3); tmp[encodedIndex] = (byte)(var18 << 2 | var19 >> 4); return tmp; } } else if(!isPad(var24) && isPad(var25)) { var20 = base64Alphabet[var24]; if((var20 & 3) != 0) { return null; } else { tmp = new byte[i * 3 + 2]; System.arraycopy(var17, 0, tmp, 0, i * 3); tmp[encodedIndex++] = (byte)(var18 << 2 | var19 >> 4); tmp[encodedIndex] = (byte)((var19 & 15) << 4 | var20 >> 2 & 15); return tmp; } } else { return null; } } } else { return null; } } } } } protected static int removeWhiteSpace(char[] data) { if(data == null) { return 0; } else { int newSize = 0; int len = data.length; for(int i = 0; i < len; ++i) { if(!isWhiteSpace(data[i])) { data[newSize++] = data[i]; } } return newSize; } } static { int i; for(i = 0; i < 128; ++i) { base64Alphabet[i] = -1; } for(i = 90; i >= 65; --i) { base64Alphabet[i] = (byte)(i - 65); } for(i = 122; i >= 97; --i) { base64Alphabet[i] = (byte)(i - 97 + 26); } for(i = 57; i >= 48; --i) { base64Alphabet[i] = (byte)(i - 48 + 52); } base64Alphabet[43] = 62; base64Alphabet[47] = 63; for(i = 0; i <= 25; ++i) { lookUpBase64Alphabet[i] = (char)(65 + i); } i = 26; int j; for(j = 0; i <= 51; ++j) { lookUpBase64Alphabet[i] = (char)(97 + j); ++i; } i = 52; for(j = 0; i <= 61; ++j) { lookUpBase64Alphabet[i] = (char)(48 + j); ++i; } lookUpBase64Alphabet[62] = 43; lookUpBase64Alphabet[63] = 47; } CompressUtils.java public static String compresss(String str){ if (str == null || str.length() == 0) { return str; } String outStr = ""; try { ByteArrayOutputStream out = new ByteArrayOutputStream(); GZIPOutputStream gzip = new GZIPOutputStream(out); gzip.write(str.getBytes()); gzip.close(); outStr = new String(Base64Utils.encode(out.toByteArray())); }catch (Exception e){ e.printStackTrace(); } return outStr; } public static String decompresss(String str) throws IOException { if (str == null || str.length() == 0) { return str; } ByteArrayOutputStream out = new ByteArrayOutputStream(); try { GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(Base64Utils.decode(str))); String outStr = ""; byte[] buffer = new byte[256]; int n; while ((n = gis.read(buffer)) >= 0) { out.write(buffer, 0, n); } }catch (Exception e){ e.printStackTrace(); } return new String(out.toByteArray()); } ———————————————— 版权声明：本文为CSDN博主「abs625」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。 原文链接：https://blog.csdn.net/abs625/article/details/76552576