获取汉字首字母

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
public class Chinesetoen {
	private final int[] li_SecPosValue = { 1601, 1637, 1833, 2078, 2274, 2302,
			2433, 2594, 2787, 3106, 3212, 3472, 3635, 3722, 3730, 3858, 4027,
			4086, 4390, 4558, 4684, 4925, 5249, 5590 };

	private final String[] lc_FirstLetter = { "a", "b", "c", "d", "e", "f",
			"g", "h", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t",
			"w", "x", "y", "z" };

	private final String ls_SecondSecTable = "CJWGNSPGCGNE[Y[BTYYZDXYKYGT[JNNJQMBSGZSCYJSYY[PGKBZGY[YWJKGKLJYWKPJQHY[W[DZLSGMRYPYWWCCKZNKYYGTTNJJNYKKZYTCJNMCYLQLYPYQFQRPZSLWBTGKJFYXJWZLTBNCXJJJJTXDTTSQZYCDXXHGCK[PHFFSS[YBGXLPPBYLL[HLXS[ZM[JHSOJNGHDZQYKLGJHSGQZHXQGKEZZWYSCSCJXYEYXADZPMDSSMZJZQJYZC[J[WQJBYZPXGZNZCPWHKXHQKMWFBPBYDTJZZKQHYLYGXFPTYJYYZPSZLFCHMQSHGMXXSXJ[[DCSBBQBEFSJYHXWGZKPYLQBGLDLCCTNMAYDDKSSNGYCSGXLYZAYBNPTSDKDYLHGYMYLCXPY[JNDQJWXQXFYYFJLEJPZRXCCQWQQSBNKYMGPLBMJRQCFLNYMYQMSQYRBCJTHZTQFRXQHXMJJCJLXQGJMSHZKBSWYEMYLTXFSYDSWLYCJQXSJNQBSCTYHBFTDCYZDJWYGHQFRXWCKQKXEBPTLPXJZSRMEBWHJLBJSLYYSMDXLCLQKXLHXJRZJMFQHXHWYWSBHTRXXGLHQHFNM[YKLDYXZPYLGG[MTCFPAJJZYLJTYANJGBJPLQGDZYQYAXBKYSECJSZNSLYZHSXLZCGHPXZHZNYTDSBCJKDLZAYFMYDLEBBGQYZKXGLDNDNYSKJSHDLYXBCGHXYPKDJMMZNGMMCLGWZSZXZJFZNMLZZTHCSYDBDLLSCDDNLKJYKJSYCJLKWHQASDKNHCSGANHDAASHTCPLCPQYBSDMPJLPZJOQLCDHJJYSPRCHN[NNLHLYYQYHWZPTCZGWWMZFFJQQQQYXACLBHKDJXDGMMYDJXZLLSYGXGKJRYWZWYCLZMSSJZLDBYD[FCXYHLXCHYZJQ[[QAGMNYXPFRKSSBJLYXYSYGLNSCMHZWWMNZJJLXXHCHSY[[TTXRYCYXBYHCSMXJSZNPWGPXXTAYBGAJCXLY[DCCWZOCWKCCSBNHCPDYZNFCYYTYCKXKYBSQKKYTQQXFCWCHCYKELZQBSQYJQCCLMTHSYWHMKTLKJLYCXWHEQQHTQH[PQ[QSCFYMNDMGBWHWLGSLLYSDLMLXPTHMJHWLJZYHZJXHTXJLHXRSWLWZJCBXMHZQXSDZPMGFCSGLSXYMJSHXPJXWMYQKSMYPLRTHBXFTPMHYXLCHLHLZYLXGSSSSTCLSLDCLRPBHZHXYYFHB[GDMYCNQQWLQHJJ[YWJZYEJJDHPBLQXTQKWHLCHQXAGTLXLJXMSL[HTZKZJECXJCJNMFBY[SFYWYBJZGNYSDZSQYRSLJPCLPWXSDWEJBJCBCNAYTWGMPAPCLYQPCLZXSBNMSGGFNZJJBZSFZYNDXHPLQKZCZWALSBCCJX[YZGWKYPSGXFZFCDKHJGXDLQFSGDSLQWZKXTMHSBGZMJZRGLYJBPMLMSXLZJQQHZYJCZYDJWBMYKLDDPMJEGXYHYLXHLQYQHKYCWCJMYYXNATJHYCCXZPCQLBZWWYTWBQCMLPMYRJCCCXFPZNZZLJPLXXYZTZLGDLDCKLYRZZGQTGJHHGJLJAXFGFJZSLCFDQZLCLGJDJCSNZLLJPJQDCCLCJXMYZFTSXGCGSBRZXJQQCTZHGYQTJQQLZXJYLYLBCYAMCSTYLPDJBYREGKLZYZHLYSZQLZNWCZCLLWJQJJJKDGJZOLBBZPPGLGHTGZXYGHZMYCNQSYCYHBHGXKAMTXYXNBSKYZZGJZLQJDFCJXDYGJQJJPMGWGJJJPKQSBGBMMCJSSCLPQPDXCDYYKY[CJDDYYGYWRHJRTGZNYQLDKLJSZZGZQZJGDYKSHPZMTLCPWNJAFYZDJCNMWESCYGLBTZCGMSSLLYXQSXSBSJSBBSGGHFJLYPMZJNLYYWDQSHZXTYYWHMZYHYWDBXBTLMSYYYFSXJC[DXXLHJHF[SXZQHFZMZCZTQCXZXRTTDJHNNYZQQMNQDMMG[YDXMJGDHCDYZBFFALLZTDLTFXMXQZDNGWQDBDCZJDXBZGSQQDDJCMBKZFFXMKDMDSYYSZCMLJDSYNSBRSKMKMPCKLGDBQTFZSWTFGGLYPLLJZHGJ[GYPZLTCSMCNBTJBQFKTHBYZGKPBBYMTDSSXTBNPDKLEYCJNYDDYKZDDHQHSDZSCTARLLTKZLGECLLKJLQJAQNBDKKGHPJTZQKSECSHALQFMMGJNLYJBBTMLYZXDCJPLDLPCQDHZYCBZSCZBZMSLJFLKRZJSNFRGJHXPDHYJYBZGDLQCSEZGXLBLGYXTWMABCHECMWYJYZLLJJYHLG[DJLSLYGKDZPZXJYYZLWCXSZFGWYYDLYHCLJSCMBJHBLYZLYCBLYDPDQYSXQZBYTDKYXJY[CNRJMPDJGKLCLJBCTBJDDBBLBLCZQRPPXJCJLZCSHLTOLJNMDDDLNGKAQHQHJGYKHEZNMSHRP[QQJCHGMFPRXHJGDYCHGHLYRZQLCYQJNZSQTKQJYMSZSWLCFQQQXYFGGYPTQWLMCRNFKKFSYYLQBMQAMMMYXCTPSHCPTXXZZSMPHPSHMCLMLDQFYQXSZYYDYJZZHQPDSZGLSTJBCKBXYQZJSGPSXQZQZRQTBDKYXZKHHGFLBCSMDLDGDZDBLZYYCXNNCSYBZBFGLZZXSWMSCCMQNJQSBDQSJTXXMBLTXZCLZSHZCXRQJGJYLXZFJPHYMZQQYDFQJJLZZNZJCDGZYGCTXMZYSCTLKPHTXHTLBJXJLXSCDQXCBBTJFQZFSLTJBTKQBXXJJLJCHCZDBZJDCZJDCPRNPQCJPFCZLCLZXZDMXMPHJSGZGSZZQLYLWTJPFSYASMCJBTZKYCWMYTCSJJLJCQLWZMALBXYFBPNLSFHTGJWEJJXXGLLJSTGSHJQLZFKCGNNNSZFDEQFHBSAQTGYLBXMMYGSZLDYDQMJJRGBJTKGDHGKBLQKBDMBYLXWCXYTTYBKMRTJZXQJBHLMHMJJZMQASLDCYXYQDLQCAFYWYXQHZ ";

	int li_offset;
	
	/**
	 * \u53D6\u5F97\u7ED9\u5B9A\u6C49\u5B57\u4E32\u7684\u9996\u5B57\u6BCD\u4E32,\u5373\u58F0\u6BCD\u4E32
	 * 
	 * @param str
	 *            \u7ED9\u5B9A\u6C49\u5B57\u4E32
	 * @return \u58F0\u6BCD\u4E32
	 */
	public String getAllFirstLetter(String str) {
		if (str == null || str.trim().length() == 0) {
			return "";
		}

		String _str = "";
		for (int i = 0; i < str.length(); i++) {
			_str = _str + this.getFirstLetter(str.substring(i, i + 1));
		}

		return _str;
	}

	/**
	 * \u53D6\u5F97\u7ED9\u5B9A\u6C49\u5B57\u7684\u9996\u5B57\u6BCD,\u5373\u58F0\u6BCD
	 * 
	 * @param chinese
	 *            \u7ED9\u5B9A\u7684\u6C49\u5B57
	 * @return \u7ED9\u5B9A\u6C49\u5B57\u7684\u58F0\u6BCD
	 */
	//\u8F93\u5165\u5B57\u7B26\u4E32\u6C49\u5B57\uFF0C\u8FD4\u56DE\u5B57\u7B26\u4E32\uFF0C\u5982\u679C\u6709\u6C49\u5B57\uFF0C\u5C06\u6C49\u5B57\u7684\u9996\u5B57\u6BCD\u7684\u8FD4\u56DE
	private String getFirstLetter(String chinese) {
		if (chinese == null || chinese.trim().length() == 0) {
			return "";
		}
		
		chinese = conversionStr(chinese, "GB2312", "ISO8859-1");
		if (chinese.length() > 1) // \u5224\u65AD\u662F\u4E0D\u662F\u6C49\u5B57
		{
			int li_SectorCode = (int) chinese.charAt(0); // \u6C49\u5B57\u533A\u7801
			int li_PositionCode = (int) chinese.charAt(1); // \u6C49\u5B57\u4F4D\u7801
			li_SectorCode = li_SectorCode - 160;
			li_PositionCode = li_PositionCode - 160;
			int li_SecPosCode = li_SectorCode * 100 + li_PositionCode; // \u6C49\u5B57\u533A\u4F4D\u7801
			if (li_SecPosCode > 1600 && li_SecPosCode < 5590) {
				for (int i = 0; i < 23; i++) {
					if (li_SecPosCode >= li_SecPosValue[i]
							&& li_SecPosCode < li_SecPosValue[i + 1]) {
						chinese = lc_FirstLetter[i].toUpperCase();
						break;
					}
				}
			} else { // \u7B2C\u4E00\u4E2A\u5B57\u7B26
				li_offset = (li_SectorCode - 56) * 94 + li_PositionCode - 1; // \u8BA1\u7B97\u504F\u79FB\u91CF
				if (li_offset >= 0 && li_offset <= 3007) { // \u4E8C\u533A\u6C49\u5B57
					chinese = ls_SecondSecTable.substring(li_offset,
							li_offset + 1); // \u53D6\u51FA\u6B64\u5B57\u58F0\u6BCD
				} else // \u975E\u6C49\u5B57\u5B57\u7B26,\u5982\u56FE\u5F62\u7B26\u53F7\u6216ASCII\u7801
				{
					chinese = conversionStr(chinese, "ISO8859-1", "GB2312");
					chinese = chinese.substring(0, 1);
				}
			}
		}

		return chinese;
	}

	/**
	 * \u5B57\u7B26\u4E32\u7F16\u7801\u8F6C\u6362
	 * 
	 * @param str
	 *            \u8981\u8F6C\u6362\u7F16\u7801\u7684\u5B57\u7B26\u4E32
	 * @param charsetName
	 *            \u539F\u6765\u7684\u7F16\u7801
	 * @param toCharsetName
	 *            \u8F6C\u6362\u540E\u7684\u7F16\u7801
	 * @return \u7ECF\u8FC7\u7F16\u7801\u8F6C\u6362\u540E\u7684\u5B57\u7B26\u4E32
	 */
	private static String conversionStr(String str, String charsetName,
			String toCharsetName) {

		try {
			str = new String(str.getBytes(charsetName), toCharsetName);
		} catch (UnsupportedEncodingException ex) {
			System.out.println("\u5B57\u7B26\u4E32\u7F16\u7801\u8F6C\u6362\u5F02\u5E38\uFF1A" + ex.getMessage());
		}

		return str;
	}
	
	public static void main(String[] args) throws IOException {
		String str="\u4F60\u8FD8\u597D\u5417";
		String encoder=URLEncoder.encode(str,"utf-8");
		System.out.println(encoder);
		String decode=URLDecoder.decode(encoder,"utf-8");
		System.out.println(decode);
		Chinesetoen chinesetoen=new Chinesetoen();
		 System.out.println(chinesetoen.getAllFirstLetter(decode).toUpperCase());
	}
}