Java實現的utf8，gbk，unicode編碼相互轉換的代碼

Java實現的utf8，gbk，unicode編碼相互轉換的代碼

public class UTF2GBK {


public String gbk2utf8(String gbk) {
    String l_temp = GBK2Unicode(gbk);
    l_temp = unicodeToUtf8(l_temp);

    return l_temp;
}

public String utf82gbk(String utf) {
    String l_temp = utf8ToUnicode(utf);
    l_temp = Unicode2GBK(l_temp);

    return l_temp;
}

/**
 *
 * @param str
 * @return String
 */

public static String GBK2Unicode(String str) {
    StringBuffer result = new StringBuffer();
    for (int i = 0; i < str.length(); i++) {
        char chr1 = (char) str.charAt(i);

        if (!isNeedConvert(chr1)) {
            result.append(chr1);
            continue;
        }

        result.append("\\u" + Integer.toHexString((int) chr1));
    }

    return result.toString();
}

/**
 *
 * @param dataStr
 * @return String
 */

public static String Unicode2GBK(String dataStr) {
    int index = 0;
    StringBuffer buffer = new StringBuffer();

    int li_len = dataStr.length();
    while (index < li_len) {
        if (index >= li_len - 1
                || !"\\u".equals(dataStr.substring(index, index + 2))) {
            buffer.append(dataStr.charAt(index));

            index++;
            continue;
        }

        String charStr = "";
        charStr = dataStr.substring(index + 2, index + 6);

        char letter = (char) Integer.parseInt(charStr, 16);

        buffer.append(letter);
        index += 6;
    }

    return buffer.toString();
}

public static boolean isNeedConvert(char para) {
    return ((para & (0x00FF)) != para);
}

/**
 * utf-8 轉unicode
 *
 * @param inStr
 * @return String
 */
public static String utf8ToUnicode(String inStr) {
    char[] myBuffer = inStr.toCharArray();

    StringBuffer sb = new StringBuffer();
    for (int i = 0; i < inStr.length(); i++) {
        UnicodeBlock ub = UnicodeBlock.of(myBuffer[i]);
        if (ub == UnicodeBlock.BASIC_LATIN) {
            sb.append(myBuffer[i]);
        } else if (ub == UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            int j = (int) myBuffer[i] - 65248;
            sb.append((char) j);
        } else {
            short s = (short) myBuffer[i];
            String hexS = Integer.toHexString(s);
            String unicode = "\\u" + hexS;
            sb.append(unicode.toLowerCase());
        }
    }
    return sb.toString();
}

/**
 *
 * @param theString
 * @return String
 */
public static String unicodeToUtf8(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();
}


}</pre>