java字符串乱码判断
public static boolean errCodes(String str){
return !(java.nio.charset.Charset.forName("GBK").newEncoder().canEncode(str));
}
//扩展判断是否为中文
public static boolean checkChinese(char ch){
return String.valueOf(ch).matches("[\u4e00-\u9fa5]");
}