一.DigestUtils实现md5加密算法例子
String password = employee.getPassword();
password = DigestUtils.md5DigestAsHex(password.getBytes());
二.spring为我们提供了一个工具类,我们可以利用该工具类来对数据进行加密
以下是DigestUtils源码
package org.springframework.util;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public abstract class DigestUtils {
private static final String MD5_ALGORITHM_NAME = "MD5";
private static final char[] HEX_CHARS = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
public DigestUtils() {
}
public static byte[] md5Digest(byte[] bytes) {
return digest("MD5", bytes);
}
public static byte[] md5Digest(InputStream inputStream) throws IOException {
return digest("MD5", inputStream);
}
public static String md5DigestAsHex(byte[] bytes) {
return digestAsHexString("MD5", bytes);
}
public static String md5DigestAsHex(InputStream inputStream) throws IOException {
return digestAsHexString("MD5", inputStream);
}
public static StringBuilder appendMd5DigestAsHex(byte[] bytes, StringBuilder builder) {
return appendDigestAsHex("MD5", bytes, builder);
}
public static StringBuilder appendMd5DigestAsHex(InputStream inputStream, StringBuilder builder) throws IOException {
return appendDigestAsHex("MD5", inputStream, builder);
}
private static MessageDigest getDigest(String algorithm) {
try {
return MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException var2) {
throw new IllegalStateException("Could not find MessageDigest with algorithm \"" + algorithm + "\"", var2);
}
}
private static byte[] digest(String algorithm, byte[] bytes) {
return getDigest(algorithm).digest(bytes);
}
private static byte[] digest(String algorithm, InputStream inputStream) throws IOException {
MessageDigest messageDigest = getDigest(algorithm);
if (inputStream instanceof UpdateMessageDigestInputStream) {
((UpdateMessageDigestInputStream)inputStream).updateMessageDigest(messageDigest);
return messageDigest.digest();
} else {
byte[] buffer = new byte[4096];
boolean var4 = true;
int bytesRead;
while((bytesRead = inputStream.read(buffer)) != -1) {
messageDigest.update(buffer, 0, bytesRead);
}
return messageDigest.digest();
}
}
private static String digestAsHexString(String algorithm, byte[] bytes) {
char[] hexDigest = digestAsHexChars(algorithm, bytes);
return new String(hexDigest);
}
private static String digestAsHexString(String algorithm, InputStream inputStream) throws IOException {
char[] hexDigest = digestAsHexChars(algorithm, inputStream);
return new String(hexDigest);
}
private static StringBuilder appendDigestAsHex(String algorithm, byte[] bytes, StringBuilder builder) {
char[] hexDigest = digestAsHexChars(algorithm, bytes);
return builder.append(hexDigest);
}
private static StringBuilder appendDigestAsHex(String algorithm, InputStream inputStream, StringBuilder builder) throws IOException {
char[] hexDigest = digestAsHexChars(algorithm, inputStream);
return builder.append(hexDigest);
}
private static char[] digestAsHexChars(String algorithm, byte[] bytes) {
byte[] digest = digest(algorithm, bytes);
return encodeHex(digest);
}
private static char[] digestAsHexChars(String algorithm, InputStream inputStream) throws IOException {
byte[] digest = digest(algorithm, inputStream);
return encodeHex(digest);
}
private static char[] encodeHex(byte[] bytes) {
char[] chars = new char[32];
for(int i = 0; i < chars.length; i += 2) {
byte b = bytes[i / 2];
chars[i] = HEX_CHARS[b >>> 4 & 15];
chars[i + 1] = HEX_CHARS[b & 15];
}
return chars;
}
}
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