Java_转换汉字(unicode)为unicode(汉字)

Java_转换汉字(unicode)为unicode(汉字)

import java.io.UnsupportedEncodingException; public class UnicodeConverter { public static void main(String[] args) throws UnsupportedEncodingException { String s = " \t小\u51AC"; System.out.println("Original:\t\t" + s); s = toEncodedUnicode(s, true); System.out.println("to unicode:\t\t" + s); s = fromEncodedUnicode(s.toCharArray(), 0, s.length()); System.out.println("from unicode:\t" + s); } 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 形式的字符串. 如 "小" to "\u5c0f" * Converts unicodes to encoded \\uxxxx and escapes * special characters with a preceding slash * * @param theString * 待转换成Unicode编码的字符串。 * @param escapeSpace * 是否忽略空格,为true时在空格后面是否加个反斜杠。 * @return 返回转换后Unicode编码的字符串。 */ public static String toEncodedUnicode(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)) { // 每个unicode有16位,每四位对应的16进制从高位保存到低位 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 形式的字符串转换成对应的编码的特殊字符串。 如 "\u5c0f" to "小". * Converts encoded \\uxxxx to unicode chars * and changes special saved chars to their original forms * * @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 static String fromEncodedUnicode(char[] in , int off, int len) { char aChar; char[] out = new char[len]; // 只短不长 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); } }​