MD5加密
import java.security.MessageDigest;public class Password {
private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
// 十六进制下数字到字符的映射数组
/** 把inputString加密 */
public static String createPassword(String inputString) {
return encodeByMD5(inputString);
}
/**
* 验证输入的密码是否正确
*
* @param password
* 真正的密码（加密后的真密码）
* @param inputString
* 输入的字符串
* @return 验证结果，boolean类型
*/
public static boolean authenticatePassword(String password,
String inputString) {
if (password.equals(encodeByMD5(inputString))) {
return true;
} else {
return false;
}
}
/** 对字符串进行MD5编码 */
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;
}
/**
* 轮换字节数组为十六进制字符串
*
* @param b
* 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));
}
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 + hexDigits;
}
public static void main(String[] args) {
String password = Password.createPassword("huangcheng");
System.out.println("对huangcheng用MD5摘要后的字符串：" + password);
String inputString = "huangchenghuangcheng";
System.out.println("huangchenghuangcheng与密码匹配？"
+ Password.authenticatePassword(password, inputString));
inputString = "huangcheng";
System.out.println("huangcheng与密码匹配？"
+ Password.authenticatePassword(password, inputString));
}
}
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