字符集编码Unicode到native

最新推荐文章于 2019-09-17 15:59:42 发布

原创最新推荐文章于 2019-09-17 15:59:42 发布 · 3.5k 阅读

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#unicode #编码

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本文详细解析了将ASCII字符转换为Unicode字符以及反向转换的方法，包括使用Java代码实现的具体步骤。

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     public static String ascii2native(String sAscii) {
            StringBuilder sb = new StringBuilder();
            String[] words = sAscii.split("\\\\u");
            sb.append(words[0]);
            for (int i = 1; i < words.length; i++) {
                String word = words[i];
                sb.append((char) Integer.parseInt(word.substring(0, 4), 16)+"");
                if (word.length() > 4) {
                    sb.append(word.substring(4));
                }
            }
            return sb.toString();
        }

  public static String native2ascii(String sNative) {
        if (TextUtils.isEmpty(sNative))
            return "";
        char[] chars = sNative.toCharArray();
        StringBuilder sb = new StringBuilder();
        for (char c : chars) {
            if (c > 127) {
                sb.append("\\u");
                sb.append(Integer.toHexString(c));
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

public static String decodeUnicode(String theString) {
        char aChar;
        int len = theString.length();
        StringBuffer outBuffer = new StringBuffer(len);
        for (int x = 0; x < len;) {
            aChar = theString.charAt(x++);
            if (aChar == '\\') {
                aChar = theString.charAt(x++);
                if (aChar == 'u') {
                    // Read the xxxx
                    int value = 0;
                    for (int i = 0; i < 4; i++) {
                        aChar = theString.charAt(x++);
                        switch (aChar) {
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                        case '8':
                        case '9':
                            value = (value << 4) + aChar - '0';
                            break;
                        case 'a':
                        case 'b':
                        case 'c':
                        case 'd':
                        case 'e':
                        case 'f':
                            value = (value << 4) + 10 + aChar - 'a';
                            break;
                        case 'A':
                        case 'B':
                        case 'C':
                        case 'D':
                        case 'E':
                        case 'F':
                            value = (value << 4) + 10 + aChar - 'A';
                            break;
                        default:
                            throw new IllegalArgumentException(
                                    "Malformed   \\uxxxx   encoding.");
                        }
                    }
                    outBuffer.append((char) value+"");
                } else {
                    if (aChar == 't')
                        aChar = '\t';
                    else if (aChar == 'r')
                        aChar = '\r';
                    else if (aChar == 'n')
                        aChar = '\n';
                    else if (aChar == 'f')
                        aChar = '\f';
                    outBuffer.append(aChar+"");
                }
            } else
                outBuffer.append(aChar+"");
        }
        return outBuffer.toString();
    }