截取包含中文的字符串（处理字符串和字节数）

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                 截取包含中文的字符串（处理字符串和字节数）

import java.io.UnsupportedEncodingException;

public class SplictString {

	public static void main(String[] args) throws Exception {
		String string = "我a爱中华abc我爱acm";
		int num = trimGBK(string.getBytes("GBK"), 5);
		System.out.println(string.substring(0, num));
				
	}
	
	public static int trimGBK(byte[] buf, int n) {
		int num = 0;
		boolean bChineseFirstHalf = false;
		for(int i = 0; i < n; i++) {
			if(buf[i] < 0 && !bChineseFirstHalf) {
				bChineseFirstHalf = true;
			}else {
				num++;
				bChineseFirstHalf = false;
			}
		}
		return num;
	}
}