java下的 UTF-8编码
public class UTFEncode {public static String encodeUTF8(String value) { try { int strlen = value.length(); StringBuffer out = new StringBuffer(); for (int i = 0; i < strlen; i++) { char t = value.charAt(i); int c = 0; c |= (t & 0xffff); if (c >= 0 && c < 0x80) { switch (t) { case '=': out.append("%3d"); break; case ' ': out.append("%20"); break; case '+': out.append("%2b"); break; case '\'': out.append("%27"); break; case '/': out.append("%2F"); break; case '.': out.append("%2E"); break; case '<': out.append("%3c"); break; case '>': out.append("%3e"); break; case '#': out.append("%23"); break; case '%': out.append("%25"); break; case '&': out.append("%26"); break; case '{': out.append("%7b"); break; case '}': out.append("%7d"); break; case '\\': out.append("%5c"); break; case '^': out.append("%5e"); break; case '~': out.append("%73"); break; case '[': out.append("%5b"); break; case ']': out.append("%5d"); break; default: out.append(t); break; } } else if (c > 0x7f && c < 0x800) { out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 6) & 0x1f) | 0xc0) })); out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 0) & 0x3f) | 0x80) })); } else if (c > 0x7ff && c < 0x10000) { out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 12) & 0x0f) | 0xe0) })); out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 6) & 0x3f) | 0x80) })); out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 0) & 0x3f) | 0x80) })); } else if (c > 0x00ffff && c < 0xfffff) { out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 18) & 0x07) | 0xf0) })); out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 12) & 0x3f) | 0x80) })); out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 6) & 0x3f) | 0x80) })); out.append("%"); out.append(byteArrayToHexString(new byte[] { (byte) (((c >>> 0) & 0x3f) | 0x80) })); } } return out.toString(); } catch (Exception ex) { ex.printStackTrace(); } return ""; }/** * * Convert a byte[] array to readable string format. This makes the "hex" * readable! * * @return result String buffer in String format * * @param in * byte[] buffer to convert to string format */ static String byteArrayToHexString(byte in[]) { byte ch = 0x00; int i = 0; if (in == null || in.length <= 0) return null; String pseudo[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" }; StringBuffer out = new StringBuffer(in.length * 2); while (i < in.length) { ch = (byte) (in & 0xF0); // Strip off high nibble ch = (byte) (ch >>> 4); // shift the bits down ch = (byte) (ch & 0x0F); // must do this is high order bit is on! out.append(pseudo[(int) ch]); // convert the nibble to a String // Character ch = (byte) (in & 0x0F); // Strip off low nibble out.append(pseudo[(int) ch]); // convert the nibble to a String // Character i++; } String rslt = new String(out); return rslt; }}
页:
[1]