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()); } }