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锁定老帖子 主题：JA检测字符串编码并转换
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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);
}
}
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