package com.mengyunzhi.common.utils;import org.apache.commons.collections4.BidiMap;import org.apache.commons.collections4.bidimap.TreeBidiMap;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import javax.validation.ValidationException;import java.util.Map;import java.util.Random;/** * 统一社会停用用代码 */public interface UnifiedCreditCodeUtils {  Logger logger = LoggerFactory.getLogger(UnifiedCreditCodeUtils.class);  String baseCode = "0123456789ABCDEFGHJKLMNPQRTUWXY";  char[] baseCodeArray = baseCode.toCharArray();  int[] wi = {1, 3, 9, 27, 19, 26, 16, 17, 20, 29, 25, 13, 8, 24, 10, 30, 28};  /**   * 生成供较验使用的 Code Map   *   * @return BidiMap   */  static BidiMap generateCodes() {    BidiMap codes = new TreeBidiMap<>();    for (int i = 0; i < baseCode.length(); i++) {      codes.put(baseCodeArray[i], i);    }    return codes;  }  /**   * 较验社会统一信用代码   *   * @param unifiedCreditCode 统一社会信息代码   * @return 符合: true   */  static boolean validateUnifiedCreditCode(String unifiedCreditCode) {    if ((unifiedCreditCode.equals("")) || unifiedCreditCode.length() != 18) {      return false;    }    Map codes = generateCodes();    int parityBit;    try {      parityBit = getParityBit(unifiedCreditCode, codes);    } catch (ValidationException e) {      return false;    }    return parityBit == codes.get(unifiedCreditCode.charAt(unifiedCreditCode.length() - 1));  }  /**   * 获取较验码   *   * @param unifiedCreditCode 统一社会信息代码   * @param codes       带有映射关系的国家代码   * @return 获取较验位的值   */  static int getParityBit(String unifiedCreditCode, Map codes) {    char[] businessCodeArray = unifiedCreditCode.toCharArray();    int sum = 0;    for (int i = 0; i < 17; i++) {      char key = businessCodeArray[i];      if (baseCode.indexOf(key) == -1) {        throw new ValidationException("第" + String.valueOf(i + 1) + "位传入了非法的字符" + key);      }      sum += (codes.get(key) * wi[i]);    }    int result = 31 - sum % 31;    return result == 31 ? 0 : result;  }  /**   * 获取一个随机的统一社会信用代码   *   * @return 统一社会信用代码   */  static String generateOneUnifiedCreditCode() {    Random random = new Random();    StringBuilder buf = new StringBuilder();    for (int i = 0; i < 17; ++i) {      int num = random.nextInt(baseCode.length() - 1);      buf.append(baseCode.charAt(num));    }    String code = buf.toString();    String upperCode = code.toUpperCase();    BidiMap codes = generateCodes();    int parityBit = getParityBit(upperCode, codes);    if (codes.getKey(parityBit) == null) {      logger.debug("生成社会统一信用代码不符合规则");      upperCode = generateOneUnifiedCreditCode();    } else {      upperCode = upperCode + codes.getKey(parityBit);    }    return upperCode;  }}

测试

package com.mengyunzhi.common.utils;import org.assertj.core.api.Assertions;import org.junit.Test;import static org.junit.Assert.*;public class UnifiedCreditCodeUtilsTest {  @Test  public void validateUnifiedCreditCode() {    String code = "911310827965850580";    Assertions.assertThat(UnifiedCreditCodeUtils.validateUnifiedCreditCode(code)).isTrue();  }}