前几天刚好有需求要把emoji对应的Unicode编码转换成文字，比如1f601对应的这个笑脸😁，但没有找到C#的把1f601转换成文字的方法，用Encoding.Unicode怎么转换都不对，最后直接复制emoji字符，Visual Studio里面竟然直接显示出来了，那就直接用字符吧，都不用转换了，然后不了了之了。
今天搞Markdown编辑器，由于前面GFM的原因，又对编码进行测试，没查到什么靠谱资料，到时找到很多emoji和Unicode对照表，https://apps.timwhitlock.info/emoji/tables/unicode拿一个笑脸https://apps.timwhitlock.info/unicode/inspect/hex/1F601开刀~
【C#】
Encoding.UTF32.GetBytes("😁") -> ["1", "f6", "1", "0"]
【js】
"😁".codePointAt(0).toString(16) -> 1f601
【java】
byte[] bytes = "😀".getBytes("utf-32");
System.out.println(getBytesCode(bytes));
private static String getBytesCode(byte[] bytes) {
String code = "";
for (byte b : bytes) {
code += "\\x" + Integer.toHexString(b & 0xff);
}
return code;
}
UTF-32结果一致
【C#】
Encoding.UTF8.GetBytes("😁") -> ["f0", "9f", "98", "81"]
【js】
encodeURIComponent("😁") -> %F0%9F%98%81
UTF-8结果一致
【js】
String.fromCodePoint('0x1f601') utf-32
【java】
String emojiName = "1f601"; //其实4个字节
int emojiCode = Integer.valueOf(emojiName, 16);
byte[] emojiBytes = int2bytes(emojiCode);
String emojiChar = new String(emojiBytes, "utf-32");
System.out.println(emojiChar);
public static byte[] int2bytes(int num){
byte[] result = new byte[4];
result[0] = (byte)((num >>> 24) & 0xff);//说明一
result[1] = (byte)((num >>> 16)& 0xff );
result[2] = (byte)((num >>> 8) & 0xff );
result[3] = (byte)((num >>> 0) & 0xff );
return result;
}
/// <summary>
/// <summary>
/// 字符串转Unicode
/// </summary>
/// <param name="source">源字符串</param>
/// <returns>Unicode编码后的字符串</returns>
public static string String2Unicode(string source)
{
byte[] bytes = Encoding.Unicode.GetBytes(source);
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < bytes.Length; i += 2)
{
stringBuilder.AppendFormat("\\u{0}{1}", bytes[i + 1].ToString("x").PadLeft(2, '0'), bytes[i].ToString("x").PadLeft(2, '0'));
}
return stringBuilder.ToString();
}
/// <summary>
/// Unicode转字符串
/// </summary>
/// <param name="source">经过Unicode编码的字符串</param>
/// <returns>正常字符串</returns>
public static string Unicode2String(string source)
{
return new Regex(@"\\u([0-9A-F]{4})", RegexOptions.IgnoreCase | RegexOptions.Compiled).Replace(
source, x => string.Empty + Convert.ToChar(Convert.ToUInt16(x.Result("$1"), 16)));
}
https://www.jianshu.com/p/8a416537deb3
