- package com.sunnylocus.util;
- import java.security.MessageDigest;
- /**
- * 对密码进行加密和验证的类
- */
- public class CipherUtil{
- //十六进制下数字到字符的映射数组
- private final static String[] hexDigits = {"0", "1", "2", "3", "4",
- "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
- /** * 把inputString加密 */
- public static String generatePassword(String inputString){
- return encodeByMD5(inputString);
- }
- /**
- * 验证输入的密码是否正确
- * @param password 加密后的密码
- * @param inputString 输入的字符串
- * @return 验证结果，TRUE:正确 FALSE:错误
- */
- public static boolean validatePassword(String password, String inputString){
- if(password.equals(encodeByMD5(inputString))){
- return true;
- } else{
- return false;
- }
- }
- /** 对字符串进行MD5加密 */
- private static String encodeByMD5(String originString){
- if (originString != null){
- try{
- //创建具有指定算法名称的信息摘要
- MessageDigest md = MessageDigest.getInstance("MD5");
- //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算
- byte[] results = md.digest(originString.getBytes());
- //将得到的字节数组变成字符串返回
- String resultString = byteArrayToHexString(results);
- return resultString.toUpperCase();
- } catch(Exception ex){
- ex.printStackTrace();
- }
- }
- return null;
- }
- /**
- * 转换字节数组为十六进制字符串
- * @param 字节数组
- * @return 十六进制字符串
- */
- private static String byteArrayToHexString(byte[] b){
- StringBuffer resultSb = new StringBuffer();
- for (int i = 0; i < b.length; i++){
- resultSb.append(byteToHexString(b[i]));
- }
- return resultSb.toString();
- }
- /** 将一个字节转化成十六进制形式的字符串 */
- private static String byteToHexString(byte b){
- int n = b;
- if (n < 0)
- n = 256 + n;
- int d1 = n / 16;
- int d2 = n % 16;
- return hexDigits[d1] + hexDigits[d2];
- }
- }
Java代码
- package com.sunnylocus.util;
- public class Main {
- public static void main(String[] args) {
- String pwd1="123";
- String pwd2="";
- CipherUtil cipher = new CipherUtil();
- System.out.println("未加密的密码:"+pwd1);
- //将123加密
- pwd2 = cipher.generatePassword(pwd1);
- System.out.println("加密后的密码:"+pwd2);
- System.out.print("验证密码是否下确:");
- if(cipher.validatePassword(pwd2, pwd1)) {
- System.out.println("正确");
- }
- else {
- System.out.println("错误");
- }
- }
- }
结果输出：
Java代码
- 未加密的密码:123
- 加密后的密码:202CB962AC59075B964B07152D234B70
- 验证密码是否下确:正确
