根据指定字符长度截取字符串（包含中英文）

public class SplitStr {

public static void main(String[] args) {
SplitStr ss = new SplitStr();
String str = "HELLO中国";
System.out.println(ss.truncateStr(str,6));
}

private String truncateStr(String str, int len) {
if(str==null || str.equals("") || len==0)
{
return "";
}
char[] charArr = str.toCharArray();
int count = 0;
StringBuilder sb = new StringBuilder("");
for(char c :charArr)
{
if(count<len)
{
if(isChinese(c))
{
if(count+1==len)
{
return sb.toString();

}
else
{
count = count+2;
sb.append(c);
}
}
else
{
count = count +1;
sb.append(c);
}
}
else
{
break;
}
}
return sb.toString();
}

private boolean isChinese(char c) {
String s = String.valueOf(c);//字符类型转化成字符串

return s.getBytes().length >1 ? true:false;
}