字符串处理--中英文截取
???? /**
???? * 判断一个字符是Ascill字符还是其它字符（如汉，日，韩文字符）
???? *
???? * @param char
???? *??????????? c, 需要判断的字符
???? * @return boolean, 返回true,Ascill字符
???? */
??? public static boolean isLetter(char c) {
??????? int k = 0x80;
??????? return c / k == 0 ? true : false;
??? }
??? /**
???? * 得到一个字符串的长度,显示的长度,一个汉字或日韩文长度为2,英文字符长度为1
???? *
???? * @param String
???? *??????????? s ,需要得到长度的字符串
???? * @return int, 得到的字符串长度
???? */
??? public static int length(String s) {
??????? if (s == null)
??????????? return 0;
??????? char[] c = s.toCharArray();
??????? int len = 0;
??????? for (int i = 0; i < c.length; i++) {
??????????? len++;
??????????? if (!isLetter(c[i])) {
??????????????? len++;
??????????? }
??????? }
??????? return len;
??? }
??? /**
???? * 截取一段字符的长度,不区分中英文,如果数字不正好，则少取一个字符位
???? *
???? * @author patriotlml
???? * @param String
???? *??????????? origin, 原始字符串
???? * @param int
???? *??????????? len, 截取长度(一个汉字长度按2算的)
???? * @return String, 返回的字符串
???? */
??? public static String substring(String origin, int len) {
??????? if (origin == null || origin.equals("")||len<1)
??????????? return "";
??????? byte[] strByte = new byte[len];
??????? if (len > length(origin)){
??????????? return origin;}
??????? System.arraycopy(origin.getBytes(), 0, strByte, 0, len);
??????? int count = 0;
??????? for (int i = 0; i < len; i++) {
??????????? int value = (int) strByte[i];
??????????? if (value < 0) {
??????????????? count++;
??????????? }
??????? }
??????? if (count % 2 != 0) {
??????????? len = (len == 1) ? ++len : --len;
??????? }
??????? return new String(strByte, 0, len);
??? }
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static String FirstNBytes(String s, int n) {
??Pattern p = Pattern.compile("^[\\u4e00-\\u9fa5]$");
??int i = 0, j = 0;
??for (char c : s.toCharArray()) {
???Matcher m = p.matcher(String.valueOf(c));
???i += m.find() ? 2 : 1;
???++j;
???if (i == n)
????break;
???if (i > n) {
????--j;
????break;
???}
??}
??return s.substring(0, j);
?}
?public static void main(String args[]) {
??String a = "我ABC汉DEF";
??for (int i = 0; i < 11; ++i)
???System.out.println("No." + i + ":" + FirstNBytes(a, i));
?}
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