实现统一社会信用代码校验

社会信用代码：由18位数字和大写的字母组成，第1位是登记管理部门代码，第2位是机构类别代码，第3~8位登记管理机关行政区划码，第9~17位主休标识码，第18位校验码。有五个部分组成。

具体详情请点击：统一社会信用代码编码规则

具体的实现代码如下：

import java.util.HashMap;
import java.util.Map;

/**
 * Desc: 社会信用代码证 检验
 * Created  2016/5/18.
 */
class Regex_CreditCode {
    static String creditCode = "91350100M000100Y43";// 测试
    static String isCreditCode = "true";
    static String error_CreditCode = "社会信用代码有误";
    static String error_CreditCode_min = "社会信用代码不足18位，请核对后再输！";
    static String error_CreditCode_max = "社会信用代码大于18位，请核对后再输！";
    static String error_CreditCode_empty ="社会信用代码不能为空！";
    private static Map datas = null;
    private static char[] pre17s;
    static int[] power = {1,3,9,27,19,26,16,17,20,29,25,13,8,24,10,30,28};
	// 社会统一信用代码不含（I、O、S、V、Z） 等字母
    static char[] code = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','T','U','W','X','Y'};
    public  static  void main(String[] args){
        String temp = creditCode;
        System.out.println(temp);
        initDatas(code.length);
        pre17(temp);
        isCreditCode(temp);
    }

    /**
     * 判断是否是一个有效的社会信用代码
     * @param creditCode
     * @return
     */
    static String isCreditCode(String creditCode){
        if("".equals(creditCode)||" ".equals(creditCode)){
            System.out.println(error_CreditCode_empty);
            return error_CreditCode_empty;
        }else if(creditCode.length()<18){
            System.out.println(error_CreditCode_min);
            return  error_CreditCode_min;
        }else if(creditCode.length()>18){
            System.out.println(error_CreditCode_max);
            return  error_CreditCode_max;
        }else{
            int sum =  sum(pre17s);
            int temp = sum%31;
            temp = temp==0?31:temp;//  谢谢 whhitli的帮助
            System.out.println(code[31-temp]+" "+(creditCode.substring(17,18).equals(code[31-temp]+"")?isCreditCode:error_CreditCode));
            return creditCode.substring(17,18).equals(code[31-temp]+"")?isCreditCode:error_CreditCode;
        }
    }

    /**
     * @param chars
     * @return
     */
    private static int sum(char[] chars){
        int sum = 0;
        for(int i=0;i();
        for(int i=0;i