java - 需要使用 Java 将带有 è 的 Java 字符串转换为\u00E8

Question

我有一个 Java String 对象，其中包含类似 "resumè" 的单词，或者包含任何国际字符的任何单词。我想要做的是将其转换为对 ASCII 字符串中的非 ASCII 字符进行编码，例如 "resum\u00E8"。我如何使用 Java 来做到这一点？

Answer 1

继承 Tagir Valeev 从 java.util.Properties 中获取的想法:

    package empty;

    public class CharsetEncode {

        public static void main(String[] args) {
            String s = "resumè";
            System.out.println(decompose(s));
        }

        public static String decompose(String s) {
            return saveConvert(s, true, true);
        }

        private static String saveConvert(String theString, boolean escapeSpace, boolean escapeUnicode) {
            int len = theString.length();
            int bufLen = len * 2;
            if (bufLen < 0) {
                bufLen = Integer.MAX_VALUE;
            }
            StringBuffer outBuffer = new StringBuffer(bufLen);

            for (int x = 0; x < len; x++) {
                char aChar = theString.charAt(x);
                // Handle common case first, selecting largest block that
                // avoids the specials below
                if ((aChar > 61) && (aChar < 127)) {
                    if (aChar == '\\') {
                        outBuffer.append('\\');
                        outBuffer.append('\\');
                        continue;
                    }
                    outBuffer.append(aChar);
                    continue;
                }
                switch (aChar) {
                case ' ':
                    if (x == 0 || escapeSpace)
                        outBuffer.append('\\');
                    outBuffer.append(' ');
                    break;
                case '\t':
                    outBuffer.append('\\');
                    outBuffer.append('t');
                    break;
                case '\n':
                    outBuffer.append('\\');
                    outBuffer.append('n');
                    break;
                case '\r':
                    outBuffer.append('\\');
                    outBuffer.append('r');
                    break;
                case '\f':
                    outBuffer.append('\\');
                    outBuffer.append('f');
                    break;
                case '=': // Fall through
                case ':': // Fall through
                case '#': // Fall through
                case '!':
                    outBuffer.append('\\');
                    outBuffer.append(aChar);
                    break;
                default:
                    if (((aChar < 0x0020) || (aChar > 0x007e)) & escapeUnicode) {
                        outBuffer.append('\\');
                        outBuffer.append('u');
                        outBuffer.append(toHex((aChar >> 12) & 0xF));
                        outBuffer.append(toHex((aChar >> 8) & 0xF));
                        outBuffer.append(toHex((aChar >> 4) & 0xF));
                        outBuffer.append(toHex(aChar & 0xF));
                    } else {
                        outBuffer.append(aChar);
                    }
                }
            }
            return outBuffer.toString();
        }

        private static char toHex(int nibble) {
            return hexDigit[(nibble & 0xF)];
        }

        /** A table of hex digits */
        private static final char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
    }