emoji表情与unicode编码互转(JS,JAVA,C#)

2019-01-23 07:40:46来源：博客园阅读 ()

1.表情字符转编码

【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

2.编码转表情字符

【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;
    }