判断字符串是否有全角字符

boolean flag=true;
//检验项目编号是否有全角字符
 for(int in=0;in  String b = c.substring(in, in+1);
//  boolean ce = java.util.regex.Pattern.matches("[\u4E00-\u9FA5]", b);
 
 if(b.getBytes().length != b.length())   {
 FailBidingName = row.getCell(3).getStringCellValue()+"(该项目编号不能是全角字符，请删除继续导入)";
 FailImportBiding.put(FailBidingName,Failindex );
 messageUpload ="false";
 flag=false;
 break;
 }