Unicode字符转换工具

最新推荐文章于 2024-10-21 15:26:15 发布

原创最新推荐文章于 2024-10-21 15:26:15 发布 · 1.9k 阅读

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#工具 #string #class #c

本文介绍了一个用于字符串Unicode编码转换的Java工具类。该工具类提供两个核心方法：toUnicode用于将普通字符串转换为Unicode编码形式，fromUnicode则实现从Unicode编码形式还原到原始字符串。文章通过具体示例展示了如何使用这些方法。

public class UnicodeConvertUtil { /** *//** Creates a new instance of CharacterSetToolkit */ public UnicodeConvertUtil() { } 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 unicodeString 字符 Unicode 码。 */ public static String fromUnicode(String unicodeString) { char[] in = unicodeString.toCharArray(); int off = 0; int len = in.length; char[] convtBuf = new char[in.length]; 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); } public static void main(String[] args) { String str = "我们是谁111111111111哈哈？"; System.out.println(toUnicode(str, true)); System.out.println(fromUnicode(toUnicode(str, true))); } }