按字节截取规定长度的字符串

字母和数字占一个字节，汉字占两个字节

package edu.bnu.myroughset_1;

public class SplitString {
	String SplitStr;
	int SplitByte;
	int count=0;
	int i=0;
	StringBuffer bf=new StringBuffer();
	public SplitString(String str, int bytes) {
		SplitStr = str;
		SplitByte = bytes;
	}

	public String SplitIt() {
		if(SplitByte==0)
			return "你取的串长度为0";
		else{
			while(SplitByte>count){
				String temp=SplitStr.substring(i, i+1);
				i++;
				bf.append(temp);
				count+=temp.getBytes().length;
			}
			return bf.toString();
		}
	}

	public static void main(String[] args) {
		SplitString ss = new SplitString(
				"e我eewa",3);
		
		System.out.println(ss.SplitIt());
	}
}