将中文转换成unicode

/** * CharacterSetToolkit.java * * Created on 2007年5月17日, 上午11:04 * * To change this template, choose Tools | Template Manager * and open the template in the editor. */package mobi.chenwei.util;/** * 进行字符操作的工具类。 * @author ChenWei * @website www.chenwei.mobi * @email [e-mail] */public class CharacterSetToolkit {        /** Creates a new instance of CharacterSetToolkit */    public CharacterSetToolkit() {    }        private static final char[] hexDigit = {        '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'    };        private static char toHex(int nibble) {        return hexDigit[(nibble & 0xF)];    }        /**     * 将字符串编码成 Unicode 。     * @param theString 待转换成Unicode编码的字符串。     * @param escapeSpace 是否忽略空格。     * @return 返回转换后Unicode编码的字符串。     */    public static String toUnicode(String theString, boolean escapeSpace) {        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)) {                        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();    }        /**     * 从 Unicode 码转换成编码前的特殊字符串。     * @param in Unicode编码的字符数组。     * @param off 转换的起始偏移量。     * @param len 转换的字符长度。     * @param convtBuf 转换的缓存字符数组。     * @return 完成转换，返回编码前的特殊字符串。     */    public String fromUnicode(char[] in, int off, int len, char[] convtBuf) {        if (convtBuf.length < len) {            int newLen = len * 2;            if (newLen < 0) {                newLen = Integer.MAX_VALUE;            }            convtBuf = new char[newLen];        }        char aChar;        char[] out = convtBuf;        int outLen = 0;        int end = off + len;                while (off < end) {            aChar = in[off++];            if (aChar == '\\') {                aChar = in[off++];                if (aChar == 'u') {                    // Read the xxxx                    int value = 0;                    for (int i = 0; i < 4; i++) {                        aChar = in[off++];                        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.");                        }                    }                    out[outLen++] = (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';                    }                    out[outLen++] = aChar;                }            } else {                out[outLen++] = (char) aChar;            }        }        return new String(out, 0, outLen);    }}