1 /**
2 * 把十六进制数字转换为十进制数字
3 * @param hexSrcStr
4 * @return
5 * 170
6 */
7 public static String convertHex2Decimal(String hexSrcStr){
8 if (hexSrcStr==null || hexSrcStr.trim().length()==0){
9 return null;
10 }
11 if (!hexSrcStr.startsWith("0x")){
12 System.out.println("十六进制数字输入非法！");
13 return null;
14 }
15 String substring1 = hexSrcStr.substring(2);
16 for (int i = 0; i < substring1.length(); i++) {
17 char charAt = substring1.charAt(i);
18 if (!(Character.isDigit(charAt) || (Character.isUpperCase(charAt) && charAt >= 'A' && charAt <= 'F'))){
19 return null;
20 }
21 }
23 HashMap<Character, Integer> characterIntegerHashMap = new HashMap<>();
24 characterIntegerHashMap.put('A',10);
25 characterIntegerHashMap.put('B',11);
26 characterIntegerHashMap.put('C',12);
27 characterIntegerHashMap.put('D',13);
28 characterIntegerHashMap.put('E',14);
29 characterIntegerHashMap.put('F',15);
31 // 0xAA
32 String substring = hexSrcStr.substring(2);
33 int length = substring.length();
34 int sum=0;
35 int ret=1;
36 for (int i = length-1; i >=0 ; i--) {
37 if (i==0){
38 ret=1;
39 }else {
40 for (int j =0;j<i;j++) {
41 ret*=16;
42 }
43 }
45 char charAt = substring.charAt((length-1)-i);
46 Integer integer=0;
47 Integer integer1=0;
48 if (Character.isDigit(charAt)){
49 String charStr = String.valueOf(charAt);
50 integer = Integer.valueOf(charStr);
51 integer*=ret;
52 }else if (Character.isUpperCase(charAt)){
53 integer1 = characterIntegerHashMap.get(charAt);
54 integer1*=ret;
55 }
57 if (Character.isDigit(charAt)){
58 sum+=integer;
59 ret=1;
60 }else if (Character.isUpperCase(charAt)){
61 sum+=integer1;
62 ret=1;
63 }
64 }
66 return String.valueOf(sum);
67 }
