RPC-GWT序列化/ java.util.Date编码

我正在创建一个序列化GWT请求的脚本，我在编码日期值时遇到问题，以符合RPC-GWT标准。 通过HTTP日志我注意到日期值被转换为一些7个字符的字符串，但我无法识别这些模式使用的算法。

有谁知道哪个算法用于加密这些日期值？

Answer 1

这些日期值被序列化为自纪元（1970年1月1日）以来的长值=>毫秒，然后以打包的forms序列化为base64以变为更短的字符串。 这里看看：

/** * Parse a string containing a base-64 encoded version of a long value. * * Keep this synchronized with the version in Base64Utils. */ static long longFromBase64(String value) { int pos = 0; long longVal = base64Value(value.charAt(pos++)); int len = value.length(); while (pos < len) { longVal <<= 6; longVal |= base64Value(value.charAt(pos++)); } return longVal; } /** * Return an optionally single-quoted string containing a base-64 encoded * version of the given long value. * * Keep this synchronized with the version in Base64Utils. */ static String longToBase64(long value) { // Convert to ints early to avoid need for long ops int low = (int) (value & 0xffffffff); int high = (int) (value >> 32); StringBuilder sb = new StringBuilder(); boolean haveNonZero = base64Append(sb, (high >> 28) & 0xf, false); haveNonZero = base64Append(sb, (high >> 22) & 0x3f, haveNonZero); haveNonZero = base64Append(sb, (high >> 16) & 0x3f, haveNonZero); haveNonZero = base64Append(sb, (high >> 10) & 0x3f, haveNonZero); haveNonZero = base64Append(sb, (high >> 4) & 0x3f, haveNonZero); int v = ((high & 0xf) << 2) | ((low >> 30) & 0x3); haveNonZero = base64Append(sb, v, haveNonZero); haveNonZero = base64Append(sb, (low >> 24) & 0x3f, haveNonZero); haveNonZero = base64Append(sb, (low >> 18) & 0x3f, haveNonZero); haveNonZero = base64Append(sb, (low >> 12) & 0x3f, haveNonZero); base64Append(sb, (low >> 6) & 0x3f, haveNonZero); base64Append(sb, low & 0x3f, true); return sb.toString(); } private static boolean base64Append(StringBuilder sb, int digit, boolean haveNonZero) { if (digit > 0) { haveNonZero = true; } if (haveNonZero) { int c; if (digit < 26) { c = 'A' + digit; } else if (digit < 52) { c = 'a' + digit - 26; } else if (digit < 62) { c = '0' + digit - 52; } else if (digit == 62) { c = '$'; } else { c = '_'; } sb.append((char) c); } return haveNonZero; } // Assume digit is one of [A-Za-z0-9$_] private static int base64Value(char digit) { if (digit >= 'A' && digit <= 'Z') { return digit - 'A'; } // No need to check digit <= 'z' if (digit >= 'a') { return digit - 'a' + 26; } if (digit >= '0' && digit <= '9') { return digit - '0' + 52; } if (digit == '$') { return 62; } // digit == '_' return 63; } 

我是在Colin Alworth的指导下用PHP自己做的

Answer 2

有关更多信息，GWT Project发布了库gwt-user （ https://mvnrepository.com/artifact/com.google.gwt/gwt-user ），其中包含类Base64Utils可以帮助编码/解码到Base64，如下所述： http://www.gwtproject.org/javadoc/latest/com/google/gwt/user/server/Base64Utils.html 。

我使用以下代码将日期转换为GWT Base64字符串（7个字符）：

 public String dateToGWTString(Date date) { SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd"); try { Date dateWithoutTime = simpleDateFormat.parse(simpleDateFormat.format(date)); return Base64Utils.toBase64(dateWithoutTime.getTime()); } catch (ParseException e) { e.printStackTrace(); } return null; }