Java

/**
 * 
 * @author xcysj
 *
 */
public class UtilIc {
	
	private UtilIc() {
		
	}
	
	private static final UtilIc instance = new UtilIc();
	
	public static UtilIc getInstance() {
		return instance;
	}
	
	

	public String get15Ic(String identityCard) {
		String retId = "";
		if(null == identityCard){
			return retId;
		}
		if(identityCard.length() == 18){
			retId = identityCard.substring(0, 6) + identityCard.substring(8, 17);
		}else{
			return identityCard;
		}
		return retId;
	}
	

	public String get18Ic(String identityCard) {
		String retId = "";
		String id17 = "";
		int sum = 0;
		int y = 0;
		// 定义数组存放加权因子（weight factor）
		int[] wf = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };
		// 定义数组存放校验码（check code）
		String[] cc = { "1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2" };
		if (identityCard.length() != 15) {
			return identityCard;
		}
		// 加上两位年19
		id17 = identityCard.substring(0, 6) + "19" + identityCard.substring(6);
		// 十七位数字本体码加权求和
		for (int i = 0; i < 17; i++) {
			sum = sum + Integer.valueOf(id17.substring(i, i + 1)) * wf[i];
		}
		// 计算模
		y = sum % 11;
		// 通过模得到对应的校验码 cc[y]
		retId = id17 + cc[y];
		return retId;
	}
	
	public static void main(String[] args) {
		UtilIc ui = UtilIc.getInstance();
		String ic15 = ui.get15Ic("511702198002221308");
		System.out.println(ic15);
		String ic18 = ui.get18Ic("511702800222130");
		System.out.println(ic18);
	}

}