SpringBootでのMD 5暗号化の使用
17650 ワード
第一歩は関連する依存を導入する
2つ目は暗号化ファイルを書くことです
ステップ3の暗号化テスト
自分でやってみる
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.9</version>
</dependency>
2つ目は暗号化ファイルを書くことです
package com.ysd.dto;
import java.io.FileInputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;
public class MD5Util
{
private static MessageDigest md5 = null;
static
{
try
{
md5 = MessageDigest.getInstance("MD5");
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
}
/**
* String md5
*
* @param string
* @return
*/
public static String getMd5(String str)
{
byte[] bs = md5.digest(str.getBytes());
StringBuilder sb = new StringBuilder(40);
for (byte x : bs)
{
if ((x & 0xff) >> 4 == 0)
{
sb.append("0").append(Integer.toHexString(x & 0xff));
}
else
{
sb.append(Integer.toHexString(x & 0xff));
}
}
return sb.toString();
}
/**
* md5
* @param inputFile
* @return
* @author ms
*/
public static String fileMD5(String inputFile)
{
// ( )
int bufferSize = 256 * 1024;
FileInputStream fileInputStream = null;
DigestInputStream digestInputStream = null;
try
{
// MD5 ( , SHA1)
MessageDigest messageDigest = MessageDigest.getInstance("MD5");
// DigestInputStream
fileInputStream = new FileInputStream(inputFile);
digestInputStream = new DigestInputStream(fileInputStream, messageDigest);
// read MD5 ,
byte[] buffer = new byte[bufferSize];
while (digestInputStream.read(buffer) > 0);
// MessageDigest
messageDigest = digestInputStream.getMessageDigest();
// , , 16
byte[] resultByteArray = messageDigest.digest();
// ,
return byteArrayToHex(resultByteArray);
}
catch (Exception e)
{
return null;
}
finally
{
try
{
digestInputStream.close();
}
catch (Exception e)
{
e.printStackTrace();
}
try
{
fileInputStream.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
public static String byteArrayToHex(byte[] b)
{
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++)
{
stmp = (Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
{
hs = hs + "0" + stmp;
}
else
{
hs = hs + stmp;
}
if (n < b.length - 1)
{
hs = hs + "";
}
}
return hs;
}
}
ステップ3の暗号化テスト
public static void main(String[] args) {
String s = MD5Util.getMd5(" ");
System.out.println(s);
}
自分でやってみる