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This article introduces the knowledge of "how to filter special characters in ut8 database". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The ut8 database cannot save more than 3 bytes of utf characters. A filter is handwritten to specify the maximum character length to be filtered.

UTF-8 Encoding Rule 1 byte 0xxxxxxx 2 bytes 110xxxxx 10xxxxxx 3 bytes 1110xxxx 10xxxxxx 10xxxxxx 4 bytes 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx 5 bytes 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 6 bytes 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx

Realize

Public static String utf8M (String str, int m) {byte [] bytes = str.getBytes (KtIo.utf8 ()); int len = bytes.length; int off = 0; byte [] buffer = null; byte b; int s; int j, k; int lst = len-1; for (int I = 0; I < len; iTunes +) {b = bytes [I] S = b & 0XFF; if (s < 192) {if (buffer! = null) {buffer [off++] = b;}} else {if (s < 224) {j = 1 } else if (s < 240) {j = 2;} else if (s < 248) {j = 3;} else if (s < 252) {j = 4;} else if (b < 254) {j = 5 } else {I + = 6; continue;} if (j < m) {/ / allowed character length j + = I If (buffer! = null) {buffer [off++] = b; k = j < lst? J: lst; for (iTunes)

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