车架号校验算法

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public class CheckVin {public static Map<Character, Integer> kv = new HashMap<Character, Integer>();public static Map<Integer, Integer> wv = new HashMap<Integer, Integer>();static {for (int i = 0; i < 10; i++) {kv.put(String.valueOf(i).charAt(0), i);}kv.put('a', 1);kv.put('b', 2);kv.put('c', 3);kv.put('d', 4);kv.put('e', 5);kv.put('f', 6);kv.put('g', 7);kv.put('h', 8);kv.put('j', 1);kv.put('k', 2);kv.put('l', 3);kv.put('m', 4);kv.put('n', 5);kv.put('p', 7);kv.put('q', 8);kv.put('r', 9);kv.put('s', 2);kv.put('t', 3);kv.put('u', 4);kv.put('v', 5);kv.put('w', 6);kv.put('x', 7);kv.put('y', 8);kv.put('z', 9);wv.put(1, 8);wv.put(2, 7);wv.put(3, 6);wv.put(4, 5);wv.put(5, 4);wv.put(6, 3);wv.put(7, 2);wv.put(8, 10);wv.put(10, 9);wv.put(11, 8);wv.put(12, 7);wv.put(13, 6);wv.put(14, 5);wv.put(15, 4);wv.put(16, 3);wv.put(17, 2);}public final static boolean isLegal(String vin) {if (null == vin) {return false;} else if (vin.trim().length() == 17) {vin = vin.trim().toLowerCase();char[] codes = vin.toCharArray();int resultInCode = 0;if ("0123456789x".contains(vin.subSequence(8, 9))) {                    //重点哟                   if(vin.subSequence(8, 9).toString().equals("x")){resultInCode = 10;}else {resultInCode = Integer.valueOf(vin.subSequence(8, 9).toString());}</span>} else {return false;}int total = 0;for (int i = 1; i < codes.length + 1; i++) {char code = codes[i - 1];if (kv.containsKey(code)) {if (9 == i) {continue;} else {total += kv.get(code) * wv.get(i);}} else {return false;}}return resultInCode == total % 11;} else {return false;}}public static void main(String[] args){String str = "LGXC14DG801001957";CheckVin  checkVin = new CheckVin(); String[] tempStr = str.split(",");for(String temp:tempStr){System.out.println(checkVin.isLegal(temp)+"\r\n");}}
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