java中按字节截取String字符串.

/**

* 取字符串的前toCount个字符

*

* @param str 被处理字符串

* @param toCount 截取长度

* @param more 后缀字符串

* @version 2004.11.24

* @author zhulx

* @return String

*/

public static String substring(String str, int toCount,String more)

{

int reInt = 0;

String reStr = "";

if (str == null)

return "";

char[] tempChar = str.toCharArray();

for (int kk = 0; (kk < tempChar.length && toCount > reInt); kk++) {

String s1 = str.valueOf(tempChar[kk]);

byte[] b = s1.getBytes();

reInt += b.length;

reStr += tempChar[kk];

}

if (toCount == reInt (toCount == reInt - 1))

reStr += more;

return reStr;

}