substringByte

gistfile1.java

	public static String substringByte(String str, int length) {
		
		int len = 0;
		StringBuffer buff = new StringBuffer();
		
		if(str == null) return null;
		
		for(int i = 0;i < str.length();i++) {
			
			if(str.charAt(i)  <= 0x7f) {
				len += 1;
			} else {
				len += 2;
			}
			
			if(len <= length) {
				buff.append(str.substring(i, i + 1));
			} else {
				break;
			}
			
		}
		
		return buff.toString();
		
	}