一维条形码ean-13格式编码 最后一位校验码的生成规则 及代码

/** * * @param code * @return 如果返回值是一个大于0的整数 如果返回-2表示所传的参数为空 ，如果返回值是-1 表示字符串中含有非数字字符 */public static int getCheckCode(String code){int checkCode = -1;if(code == null || "".equals(code)){return -2;}else if(!Pattern.compile("^[0-9]*$").matcher(code).matches()){checkCode = -1;}else{try{int evensum = 0; //偶数位的和int oddsum = 0; //奇数位的和evensum += Integer.parseInt(code.substring(11,12));evensum += Integer.parseInt(code.substring(9,10));evensum += Integer.parseInt(code.substring(7,8));evensum += Integer.parseInt(code.substring(5,6));evensum += Integer.parseInt(code.substring(3,4));evensum += Integer.parseInt(code.substring(1,2));evensum *= 3;oddsum += Integer.parseInt(code.substring(10,11));oddsum += Integer.parseInt(code.substring(8,9));oddsum += Integer.parseInt(code.substring(6,7));oddsum += Integer.parseInt(code.substring(4,5));oddsum += Integer.parseInt(code.substring(2,3));oddsum += Integer.parseInt(code.substring(0,1));int sum = evensum + oddsum;int ck = 0;if(sum % 10 == 0){ck = sum;}else{ck = (sum/10+1)*10;}checkCode = ck-sum;}catch(NumberFormatException e){System.out.println("编码的格式不正确！");}catch(Exception e){e.printStackTrace();}}return checkCode;}