华为机试练习---按字节数截取字符串

package interview;

import java.io.UnsupportedEncodingException;
import java.util.Scanner;

/**
* 输入一个字符串和字节数，按照字节数截取字符串。汉字两个字节，不能拆开
* 如：
* 输入：我JAVA是ABC 6
* 输出：我JAVA
* 输入：我JAVA是ABC 7
* 输出：我JAVA
* @author USER
*
*/
public class CutStringByBytes {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
String string = in.next();
int len = in.nextInt();
try {
cutString(string,len);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

private static void cutString(String str, int len) throws UnsupportedEncodingException {

StringBuffer sb = new StringBuffer();
int count = 0;//存储字节数
if (len >0 && len <= str.getBytes().length) {
for (int i = 0; i < str.length(); i++) {
int curSize = String.valueOf(str.charAt(i)).getBytes().length;
if (curSize > 1) {
count += 2;
}else {
count++;
}
if (count > len) {
break;
}
sb.append(str.charAt(i));
}
}
System.out.println(sb.toString());
}
}