[求助]UTF-8和UTF-16的区别

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UTF-8 is the byte-oriented encoding form of Unicode. For details of its definition, see Section 2.5 “Encoding Forms” and Section 3.9 “ Unicode Encoding Forms ” in the Unicode Standard. See, in particular, Table 3-6 UTF-8 Bit Distribution and Table 3-7 Well-formed UTF-8 Byte Sequences, which give succinct summaries of the encoding form. Make sure you refer to the latest version of the Unicode Standard, as the  Unicode Technical Committee has tightened the definition of UTF-8 over time to more strictly enforce unique sequences and to prohibit encoding of certain invalid characters. There is an Internet RFC 3629 about UTF-8. UTF-8 is also defined in Annex D of ISO/IEC 10646.

       UTF-16 uses a single 16-bitcode unit to encode the most common 63K characters, and a pair of 16-bit code unites, called surrogates, to encode the 1M less commonly used characters in Unicode.Originally, Unicode was designed as a pure 16-bit encoding, aimed at representing all modern scripts. (Ancient scripts were to be represented with private-use characters.) Over time, and especially after the addition of over 14,500 composite characters for compatibility with legacy sets, it became clear that 16-bits were not sufficient for the user community. Out of this arose UTF-16.

from "http://unicode.org/faq/utf_bom.html#UTF16 "