?1?package?com.jqqd.test;????
?2???
?3?import?java.security.MessageDigest;????
?4???
?5?public?class?Password?{????
?6???
?7?private?final?static?String[]?hexDigits?=?{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};????
?8?//十六進制下數字到字符的映射數組????
?9???
10?/**把inputString加密*/????
11?public?static?String?createPassword(String?inputString){????
12?return?encodeByMD5(inputString);????
13?}????
14???
15?/**???
16?*?驗證輸入的密碼是否正確???
17?*?@param?password?真正的密碼（加密后的真密碼）???
18?*?@param?inputString?輸入的字符串???
19?*?@return?驗證結果，boolean類型???
20?*/????
21?public?static?boolean?authenticatePassword(String?password,String?inputString){????
22?if(password.equals(encodeByMD5(inputString))){????
23?return?true;????
24?}else{????
25?return?false;????
26?}????
27?}????
28???
29?/**對字符串進行MD5編碼*/????
30?private?static?String?encodeByMD5(String?originString){????
31?if(originString?!=?null){????
32?try{????
33?//創建具有指定算法名稱的信息摘要????
34?MessageDigest?md?=?MessageDigest.getInstance("MD5");????
35?//使用指定的字節數組對摘要進行最后更新，然后完成摘要計算????
36?byte[]?results?=?md.digest(originString.getBytes());????
37?//將得到的字節數組變成字符串返回????
38?String?resultString?=?byteArrayToHexString(results);????
39?return?resultString.toUpperCase();????
40?}catch(Exception?ex){????
41?ex.printStackTrace();????
42?}????
43?}????
44?return?null;????
45?}????
46???
47?/**???
48?*?輪換字節數組為十六進制字符串???
49?*?@param?b?字節數組???
50?*?@return?十六進制字符串???
51?*/????
52?private?static?String?byteArrayToHexString(byte[]?b){????
53?StringBuffer?resultSb?=?new?StringBuffer();????
54?for(int?i=0;i<b.length;i++){????
55?resultSb.append(byteToHexString(b[i]));????
56?}????
57?return?resultSb.toString();????
58?}????
59???
60?/**???
61?*?將一個字節轉化成十六進制形式的字符串???
62?*/????
63?private?static?String?byteToHexString(byte?b){????
64?int?n?=?b;????
65?if(n<0)????
66?n=256+n;????
67?int?d1?=?n/16;????
68?int?d2?=?n%16;????
69?return?hexDigits[d1]?+?hexDigits[d2];????
70?}????
71???
72?public?static?void?main(String[]?args){????
73?String?password?=?Password.createPassword("yaowenchao");????
74?System.out.println("對yaowenchao用MD5摘要后的字符串："+password);????
75?String?inputString?=?"tianshi0253";????
76?System.out.println("tianshi0253與密碼匹配？"+Password.authenticatePassword(password,?inputString));????
77?inputString?=?"yaowenchao";????
78?System.out.println("yaowenchao與密碼匹配？"+Password.authenticatePassword(password,?inputString));????
79?}????
80???
81?}??