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发表时间:2011-08-03
就一个类,detectUtf8(String w3UrlPart)方法
package com.mountain.util; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Map; public class Utf8Utils { private static final org.apache.log4j.Logger log = org.apache.log4j.Logger .getLogger(Utf8Utils.class); public static String detectUtf8(String w3UrlPart) { byte[] bts; try { bts = w3UrlPart.getBytes("iso-8859-1"); if (likeMultiByteUtf8(bts)) { String t = new String(bts, "UTF-8"); if (log.isDebugEnabled()) { log.debug(w3UrlPart + ">treat as utf8.[" + t + "]"); } return t; } else { String t = new String(bts, "GB18030"); if (log.isDebugEnabled()) { log.debug(w3UrlPart + ">treat as gbxxx [" + t + "]"); } return t; } } catch (UnsupportedEncodingException e) { log.error("", e); throw new RuntimeException(e); } } private static boolean likeMultiByteUtf8(byte[] bts) { int len = checkUtf8(bts); if (len > 2) return true; return false; } private static boolean likeEncodedUrl(String urlPart) { String r = urlPart.replaceAll("%25", ""); return r.indexOf("%") > -1; } public static String detectUtf8Url(String w3UrlPart) { if (likeEncodedUrl(w3UrlPart)) { w3UrlPart = URLDecoder.decodeUrl(w3UrlPart); } return detectUtf8(w3UrlPart); } static class Utf8Magic { protected static final byte bm1 = (byte) 0x80; // 0x0 protected static final byte bm2 = (byte) 0xE0;// 0xC0; protected static final byte bm3 = (byte) 0xF0;// 0xE0; protected static final byte bm4 = (byte) 0xF8;// 0xF0; protected static final byte tm1 = (byte) 0x0; protected static final byte tm2 = (byte) 0xC0; protected static final byte tm3 = (byte) 0xE0; protected static final byte tm4 = (byte) 0xF0; public static byte[] bms = new byte[] { bm1, bm2, bm3, bm4 }; public static byte[] tms = new byte[] { tm1, tm2, tm3, tm4 }; public static byte[] maskBits = new byte[] { bm1, bm2, bm3, bm4 }; public static byte[] magicBits = new byte[] { tm1, tm2, tm3, tm4 }; public static byte siblingMask = (byte) 0xC0;// 后续字节 public static byte siblingMagicBits = (byte) 0x80; // ut16 only // DC00..DFFF; Low Surrogates // D800..DB7F; High Surrogates public static byte firstLowSurrogates = (byte) 0xDC; public static byte lastLowSurrogates = (byte) 0xDF; public static byte firstHighSurrogates = (byte) 0xD8; public static byte lastHighSurrogates = (byte) 0xDB; } // private boolean isUtf8(byte[] bs) { // return isUtf8(bs, false); // } public static boolean isMultiByteUtf8(byte[] bs) { return isUtf8(bs, true); } public static boolean isUtf8(byte[] bs, boolean multibyte) { // printHex(bs); // System.outt.println("length multibyte?" + multibyte); StringBuilder sb = null; if (log.isDebugEnabled()) { sb = new StringBuilder(); } try { for (int i = 0; i < bs.length; i++) { byte b = bs[i]; if (log.isDebugEnabled()) { sb.append("\n"); sb.append(i).append(" : 0x").append( Integer.toString((0xFF & b), 16)).append("_") .append(Integer.toString((0xFF & b), 2)); } // System.outt.print(i); // System.outt.print(" : 0x"); // System.out.println(Integer.toString(b, 16)); for (int j = 0; j < Utf8Magic.maskBits.length; j++) { if ((b & Utf8Magic.maskBits[j]) == Utf8Magic.magicBits[j]) { if (j == 0) { // 单字节 if (multibyte) { // System.outt.println(" no allow single byte"); if (log.isDebugEnabled()) { sb.append(",not allow single byte"); } return false; } else { } } else { // 后面有j个字节,共j + 1 byte for (int k = 0; k < j; k++) { if ((bs[++i] & Utf8Magic.siblingMask) != Utf8Magic.siblingMagicBits) { // System.outt.println(" not match " + // Integer.toHexString(0xFF & bs[i])); if (log.isDebugEnabled()) { sb .append(", not match ") .append( Integer.toString( 0xFF & bs[i], 16)) .append("_") .append( Integer .toString( 0xFF & bs[i], 2)); } return false; } else { // System.outt.println(" match " + // Integer.toHexString(0xFF & bs[i])); if (log.isDebugEnabled()) { sb .append(", ") .append( Integer.toString( 0xFF & bs[i], 16)) .append("_") .append( Integer .toString( 0xFF & bs[i], 2)); } } } } // System.outt.println("match by " + j); if (log.isDebugEnabled()) { sb.append(", match by " + j); } break; } else { if (j >= Utf8Magic.maskBits.length - 1) { // System.outt.println(j); // System.outt.println("no mask match"); if (log.isDebugEnabled()) { sb.append(", no mask match ").append(j); } return false; } } } // System.outt.println(); } return true; } finally { if (log.isDebugEnabled()) { log.debug(sb.toString()); } } } private static class MatchCtx { private static ByteMatcher firstByteMatcher = new Utf8FirstByteMatcher(); private static ByteMatcher otherByteMatcher = new Utf8OtherByteMatcher(); private int encLength; private int require; private int found; private int maxByteLen = 0; private ByteMatcher matcher; private StringBuilder sb; public MatchCtx() { init(); if (log.isDebugEnabled()) { sb = new StringBuilder(1024); } } private void init() { this.matcher = firstByteMatcher; this.found = 0; this.require = 0; this.encLength = 0; } public ByteMatcher matcher() { return matcher; } public void start(int len) { this.encLength = len; this.require = len - 1; this.matcher = otherByteMatcher; if (len == 1) { if (maxByteLen == 0) maxByteLen = 1; init(); } } public void consume() { found++; if (found >= require) { // switch to next character start if (encLength > maxByteLen) { maxByteLen = encLength; } init(); } } public int getMaxByteLen() { return maxByteLen; } public void debug(Object... msgs) { if (msgs != null) { for (Object o : msgs) { sb.append(String.valueOf(o)); } } } @Override public String toString() { if (log.isDebugEnabled()) { return sb.toString(); } return super.toString(); } } private static interface ByteMatcher { boolean match(byte bt, MatchCtx ctx); } private static String hex(byte b) { return Integer.toHexString(0xFF & b); } private static class Utf8FirstByteMatcher implements ByteMatcher { public boolean match(byte bt, MatchCtx ctx) { // if (log.isDebugEnabled()) { // log.debug("match first byte " + hex(bt)); // } if (log.isDebugEnabled()) { ctx.debug("[0x", hex(bt), " "); } for (int i = 0; i < Utf8Magic.magicBits.length; i++) { // if (log.isDebugEnabled()) { // log.debug("magicBits " + hex(Utf8Magic.magicBits[i])); // } if ((bt & Utf8Magic.maskBits[i]) == Utf8Magic.magicBits[i]) { if (log.isDebugEnabled()) { ctx.debug(i + 1, ":", hex(Utf8Magic.magicBits[i])); } ctx.start(i + 1); return true; } } if (log.isDebugEnabled()) { ctx.debug("^"); } return false; } } private static class Utf8OtherByteMatcher implements ByteMatcher { public boolean match(byte bt, MatchCtx ctx) { if (log.isDebugEnabled()) { ctx.debug(" ", hex(bt)); } if ((bt & Utf8Magic.siblingMask) == Utf8Magic.siblingMagicBits) { ctx.consume(); return true; } if (log.isDebugEnabled()) { ctx.debug("^"); } return false; } } /** * @param bs * @return 如果是utf-8,那么返回最长的utf8码字节数 */ public static int checkUtf8(byte[] bs) { MatchCtx ctx = new MatchCtx(); try { for (int i = 0; i < bs.length; i++) { byte b = bs[i]; if (!ctx.matcher().match(b, ctx)) { // not utf8 return 0; } } } finally { if (log.isDebugEnabled()) { log.debug(ctx); } } return ctx.getMaxByteLen(); } public static String encode(String part) { if (part == null) return null; return URLEncoder.encodeUrl(part); } private static Map<Character.UnicodeBlock, Boolean> FullWidthBlocks = new HashMap<Character.UnicodeBlock, Boolean>(); static { FullWidthBlocks.put(Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS, Boolean.TRUE); FullWidthBlocks.put( Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A, Boolean.TRUE); FullWidthBlocks.put( Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B, Boolean.TRUE); FullWidthBlocks.put( Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS, Boolean.TRUE); FullWidthBlocks.put( Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.KANBUN, Boolean.TRUE); // Radicals and Strokes FullWidthBlocks.put(Character.UnicodeBlock.CJK_RADICALS_SUPPLEMENT, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.KANGXI_RADICALS, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.CJK_COMPATIBILITY, Boolean.TRUE);// ? FullWidthBlocks.put(Character.UnicodeBlock.CJK_COMPATIBILITY_FORMS, Boolean.TRUE);// ? FullWidthBlocks.put(Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION, Boolean.TRUE); // Chinese-specific FullWidthBlocks.put(Character.UnicodeBlock.BOPOMOFO, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.BOPOMOFO_EXTENDED, Boolean.TRUE); // japanese FullWidthBlocks.put(Character.UnicodeBlock.HIRAGANA, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.KATAKANA, Boolean.TRUE); FullWidthBlocks.put( Character.UnicodeBlock.KATAKANA_PHONETIC_EXTENSIONS, Boolean.TRUE); // korea FullWidthBlocks.put(Character.UnicodeBlock.HANGUL_SYLLABLES, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.HANGUL_JAMO, Boolean.TRUE); FullWidthBlocks.put(Character.UnicodeBlock.HANGUL_COMPATIBILITY_JAMO, Boolean.TRUE); } public static boolean isHalfWidth(int codepoint) { if (true) { return !isFullWidth(codepoint); } Character.UnicodeBlock ub = null; try { ub = Character.UnicodeBlock.of(codepoint); } catch (Exception e) { log.error("cant find a unicode block for " + codepoint, e); } if (ub != null) { if (ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) { // if (codepoint >= 0xFF00 && codepoint <= 0xff60) { return false; } else if (codepoint >= 0xffe0 && codepoint <= 0xffe6) { return false; } else { return true; } } else if (FullWidthBlocks.containsKey(ub)) { return false; } } return true; } private static int[] fwstarts = new int[] { // 0, 0x00A1, 0x00A4, 0x00A7, 0x00AA, 0x00AD, 0x00B0, 0x00B6, 0x00BC, 0x00C6, 0x00D0, 0x00D7, 0x00DE, 0x00E6, 0x00E8, 0x00EC, 0x00F0, 0x00F2, 0x00F7, 0x00FC, 0x00FE, 0x0101, 0x0111, 0x0113, 0x011B, 0x0126, 0x012B, 0x0131, 0x0138, 0x013F, 0x0144, 0x0148, 0x014D, 0x0152, 0x0166, 0x016B, 0x01CE, 0x01D0, 0x01D2, 0x01D4, 0x01D6, 0x01D8, 0x01DA, 0x01DC, 0x0251, 0x0261, 0x02C4, 0x02C7, 0x02C9, 0x02CD, 0x02D0, 0x02D8, 0x02DD, 0x02DF, 0x0300, 0x0391, 0x03A3, 0x03B1, 0x03C3, 0x0401, 0x0410, 0x0451, 0x1100, 0x115F, 0x2010, 0x2013, 0x2018, 0x201C, 0x2020, 0x2024, 0x2030, 0x2032, 0x2035, 0x203B, 0x203E, 0x2074, 0x207F, 0x2081, 0x20AC, 0x2103, 0x2105, 0x2109, 0x2113, 0x2116, 0x2121, 0x2126, 0x212B, 0x2153, 0x215B, 0x2160, 0x2170, 0x2190, 0x21B8, 0x21D2, 0x21D4, 0x21E7, 0x2200, 0x2202, 0x2207, 0x220B, 0x220F, 0x2211, 0x2215, 0x221A, 0x221D, 0x2223, 0x2225, 0x2227, 0x222E, 0x2234, 0x223C, 0x2248, 0x224C, 0x2252, 0x2260, 0x2264, 0x226A, 0x226E, 0x2282, 0x2286, 0x2295, 0x2299, 0x22A5, 0x22BF, 0x2312, 0x2329, 0x2460, 0x24EB, 0x2550, 0x2580, 0x2592, 0x25A0, 0x25A3, 0x25B2, 0x25B6, 0x25BC, 0x25C0, 0x25C6, 0x25CB, 0x25CE, 0x25E2, 0x25EF, 0x2605, 0x2609, 0x260E, 0x2614, 0x261C, 0x261E, 0x2640, 0x2642, 0x2660, 0x2663, 0x2667, 0x266C, 0x266F, 0x273D, 0x2776, 0x2E80, 0x2E9B, 0x2F00, 0x2FF0, 0x3000, 0x3041, 0x3099, 0x3105, 0x3131, 0x3190, 0x31C0, 0x31F0, 0x3220, 0x3250, 0x3300, 0x3400, 0x4E00, 0xA000, 0xA490, 0xAC00, 0xE000, 0xF900, 0xFA30, 0xFA70, 0xFE00, 0xFE30, 0xFE54, 0xFE68, 0xFF01, 0xFFE0, 0xFFFD, 0x20000, 0x2A6D7, 0x2F800, 0x2FA1E, 0x30000, 0xE0100, 0xF0000, 0x100000 }; private static int[] fwends = new int[] { // 0, 0x00A1, 0x00A4, 0x00A8, 0x00AA, 0x00AE, 0x00B4, 0x00BA, 0x00BF, 0x00C6, 0x00D0, 0x00D8, 0x00E1, 0x00E6, 0x00EA, 0x00ED, 0x00F0, 0x00F3, 0x00FA, 0x00FC, 0x00FE, 0x0101, 0x0111, 0x0113, 0x011B, 0x0127, 0x012B, 0x0133, 0x0138, 0x0142, 0x0144, 0x014B, 0x014D, 0x0153, 0x0167, 0x016B, 0x01CE, 0x01D0, 0x01D2, 0x01D4, 0x01D6, 0x01D8, 0x01DA, 0x01DC, 0x0251, 0x0261, 0x02C4, 0x02C7, 0x02CB, 0x02CD, 0x02D0, 0x02DB, 0x02DD, 0x02DF, 0x036F, 0x03A1, 0x03A9, 0x03C1, 0x03C9, 0x0401, 0x044F, 0x0451, 0x1159, 0x115F, 0x2010, 0x2016, 0x2019, 0x201D, 0x2022, 0x2027, 0x2030, 0x2033, 0x2035, 0x203B, 0x203E, 0x2074, 0x207F, 0x2084, 0x20AC, 0x2103, 0x2105, 0x2109, 0x2113, 0x2116, 0x2122, 0x2126, 0x212B, 0x2154, 0x215E, 0x216B, 0x2179, 0x2199, 0x21B9, 0x21D2, 0x21D4, 0x21E7, 0x2200, 0x2203, 0x2208, 0x220B, 0x220F, 0x2211, 0x2215, 0x221A, 0x2220, 0x2223, 0x2225, 0x222C, 0x222E, 0x2237, 0x223D, 0x2248, 0x224C, 0x2252, 0x2261, 0x2267, 0x226B, 0x226F, 0x2283, 0x2287, 0x2295, 0x2299, 0x22A5, 0x22BF, 0x2312, 0x232A, 0x24E9, 0x254B, 0x2573, 0x258F, 0x2595, 0x25A1, 0x25A9, 0x25B3, 0x25B7, 0x25BD, 0x25C1, 0x25C8, 0x25CB, 0x25D1, 0x25E5, 0x25EF, 0x2606, 0x2609, 0x260F, 0x2615, 0x261C, 0x261E, 0x2640, 0x2642, 0x2661, 0x2665, 0x266A, 0x266D, 0x266F, 0x273D, 0x277F, 0x2E99, 0x2EF3, 0x2FD5, 0x2FFB, 0x303E, 0x3096, 0x30FF, 0x312C, 0x318E, 0x31B7, 0x31CF, 0x321E, 0x3243, 0x32FE, 0x33FF, 0x4DB5, 0x9FBB, 0xA48C, 0xA4C6, 0xD7A3, 0xF8FF, 0xFA2D, 0xFA6A, 0xFAD9, 0xFE19, 0xFE52, 0xFE66, 0xFE6B, 0xFF60, 0xFFE6, 0xFFFD, 0x2A6D6, 0x2F7FF, 0x2FA1D, 0x2FFFD, 0x3FFFD, 0xE01EF, 0xFFFFD, 0x10FFFD }; private static int fwlength = fwstarts.length; public static boolean isFullWidth(int codePoint) { int top, bottom, current; bottom = 0; top = fwlength; current = top / 2; while (top - bottom > 1) { if (codePoint >= fwstarts[current]) { bottom = current; } else { top = current; } current = (top + bottom) / 2; } // System.out.println("current:" + current); if (codePoint <= fwends[current]) { return true; } return false; } public static int viewUnitLen(String str) { if (str == null) return 0; char ch, chl; int cnt = str.length(); int units = 0; int codePoint = 0; int i = 0; for (i = 0; i < cnt;) { ch = str.charAt(i++); if (Character.isHighSurrogate(ch)) { chl = str.charAt(i++); codePoint = Character.toCodePoint(ch, chl); } else { codePoint = ch; } if (Utf8Utils.isFullWidth(codePoint)) { units++; } else { // System.out.println("halfwidth:" + ch); } units++; } return units; } public static String toHw(String str) { if (str == null) { return str; } int len = str.length(); StringBuilder sb = new StringBuilder(len); char ch; boolean lastIsEng = true; for (int i = 0; i < len;) { ch = str.charAt(i++); if ((ch > 0xFF00) && (ch <= 0xFF5E)) { // System.out.println("w-- " + ch); sb.append((char) (ch - 0xFEE0)); lastIsEng = true; } else if (ch == 0x3002 || ch == 0xFF61) { if (lastIsEng) { sb.append('.'); } else { sb.append(ch); } } else { // System.out.println("h-- " + ch + ", 0x" // + Integer.toString(ch, 16)); sb.append(ch); lastIsEng = false; } } return sb.toString(); } public static String stripb(String str, int len) { if (str == null) return null; str = str.trim(); char ch, chl; int cnt = str.length(); int bytes = 0; int codePoint = 0; int i = 0; for (i = 0; i < cnt;) { ch = str.charAt(i++); if (Character.isHighSurrogate(ch)) { chl = str.charAt(i++); codePoint = Character.toCodePoint(ch, chl); } else { codePoint = ch; } if (Utf8Utils.isHalfWidth(codePoint)) { } else { bytes++; } bytes++; if (bytes >= len) { break; } } if (i >= cnt) { return str; } return str.substring(0, i); } } 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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