java字符串截取 （支持中英文）cutString(s, n)

[java]代码库

import java.io.UnsupportedEncodingException;

public class CutString {
	public static void main(String[] args) throws UnsupportedEncodingException {
		String s = "我们DEF";
		int n = 5;
		String str = cutString(s, n);
		System.out.println(str);
	}

	private static String cutString(String s, int n)
			throws UnsupportedEncodingException {
		// TODO Auto-generated method stub
		if (s != null && "".equals(s)) {
			s = new String(s.getBytes(), "GBK");

		}
		StringBuffer buffer = new StringBuffer();
		if (n != 0 && n < s.getBytes("GBK").length) {

			for (int i = 0; i < n; i++) {
				char c = s.charAt(i);
				buffer.append(c);
				// System.out.println("buffer=" + buffer.toString());
				if (CutString.isChinens(c)) {
					--n;
				}

			}

		}

		return buffer.toString();
	}

	private static boolean isChinens(char c)
			throws UnsupportedEncodingException {
		// TODO Auto-generated method stub
		if (String.valueOf(c).getBytes("GBK").length > 1) {
			return true;
		} else {
			return false;
		}
	}

}