学步园

public static String SubStrByByte(String str,int startIndex,int length)<br /> {<br /> StringBuilder sb = new StringBuilder();<br /> //已截取 字符串<br /> int len = 0;<br /> //中文字符数目<br /> int cnCount = 0;<br /> String[] arr = new String[str.length()];<br /> arr = str.split("");</p> <p> for(int i = startIndex + 1; i< arr.length; i++)<br /> {<br /> if(arr[i].getBytes().length == 1)<br /> {<br /> len = len + 1;<br /> }<br /> else if(arr[i].getBytes().length == 2)<br /> {<br /> cnCount ++;<br /> len = len + 2;<br /> }<br /> sb.append(arr[i]);<br /> if(len >= length)<br /> break;<br /> }<br /> if(len >= length)<br /> return sb.toString().substring(0,length - cnCount);<br /> else<br /> return sb.toString();<br /> }</p> <p>public static void main(String[] args)<br /> {<br /> String str = "あ23我我2我as";<br /> String byteStr = StringUtil.SubStrByByte(str,2,8);<br /> System.out.println(byteStr);<br /> }

输出结果：3我我2我