java将字符串换成Unicode编码

直接上代码package example; public class UnicodeExample { public static void main(String[] args){ //System.out.println("/u301c"); //System.out.println(toUnicode("",false)); //System.out.println(toUnicode("",false)); //System.out.println(toUnicode("",false)); } 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)]; } 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(); } 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); } }