/** * Unicode字符集转换 * 提取于JDK 1.5.0_08 java.util.Properties类的私有方法（loadConvert，saveConvert） * * @date 2009-4-7 17:09 */public class CharacterSetToolkit { /** * 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。 */ /* * Converts encoded \uxxxx to unicode chars * and changes special saved chars to their original forms */ public static String unicodeToString(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); } /** * 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。 */ /* * Converts unicodes to encoded \uxxxx and escapes * special characters with a preceding slash */ public static String stringToUnicode(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(); } /** * Convert a nibble to a hex character * @param nibble the nibble to convert. */ 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' };}
相关资源：java中字符串转unicode
