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文章出处：http://xxiao0359.blog.163.com/blog/static/979413752010109045701/
import java.security.MessageDigest;
public class Password {
//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"};
public static String createPassword(String inputString){
return encodeByMD5(inputString);
}
public static boolean authenticatePassword(String password, String inputString) {
if(password.equals(encodeByMD5(inputString))) {
return true;
} else {
return false;
}
}
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;
}
private static String byteArrayToHexString(byte[] b) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i <</span> b.length; i++) {
resultSb.append(byteToHexString(b[i]));
}
return resultSb.toString();
}
private static String byteToHexString(byte b) {
int n = b;
if (n <</span> 0)
n = 256 + n;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static void main(String[] args) {
String password = Password.createPassword("888888");
System.out.println("对888888用MD5摘要后的字符串：" + password);
String inputString = "8888";
System.out.println("8888与密码匹配？" +
Password.authenticatePassword(password, inputString));
inputString = "888888";
System.out.println("888888与密码匹配？" +
Password.authenticatePassword(password, inputString));
}
 }
输出结果：
对123456用MD5摘要后的字符串：E10ADC3949BA59ABBE56E057F20F883E
1234与密码匹配？false
123456与密码匹配？true
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