使用封装类进行转换时候报错，java.lang.NumberFormatException: For input string: ""

 经检查，错误由于从数据库读取的字符串为" ",而用interger转型为int出错....

转换之前数据最好加一个校验.

String sql13= "select code1,codealias,othersign from ldcode1 where codetype='checkidtype' and code='"+idtype+"'";
		s1=meExeSQL.execSQL(sql13);
		String othersign=s1.GetText(1, 3);		
		int first=Integer.parseInt(s1.GetText(1, 1));
		String codelias=s1.GetText(1, 2);
		if(!("".equals(codelias)||codelias==null)){
			int two=Integer.parseInt(s1.GetText(1, 2));
			if("double".equals(othersign)){
				if(idno.length()!=first&&idno.length()!=two){
					error="录入的证件号码有误，请检查！！";
					writeerror(error, prtno);
					return false;
				}
				
			}
			if("between".equals(othersign)){
				if(idno.length()two){
					error="录入的证件号码有误，请检查！！";
					writeerror(error, prtno);
					return false;
				}
				
			}
		}

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