MessageDigest鏄疛ava涓敤浜庤绠楀搱甯岀畻娉曠殑绫伙紝鍙互鐢ㄤ簬璁＄畻MD5銆丼HA-1銆丼HA-256绛夊搱甯岀畻娉曠殑鎽樿銆備娇鐢∕essageDigest绫荤殑姝ラ濡備笅锛?/p>

1. 浣跨敤getInstance鏂规硶鑾峰彇MessageDigest瀵硅薄锛屼紶鍏ユ寚瀹氱殑绠楁硶鍚嶇О銆備緥濡傦紝瑕佽绠桵D5鎽樿锛屽彲浠ヤ娇鐢ㄤ互涓嬩唬鐮侊細

MessageDigest md = MessageDigest.getInstance("MD5");

2. 璋冪敤reset鏂规硶閲嶇疆MessageDigest瀵硅薄鐨勭姸鎬侊紝浠ヤ究涔嬪悗鍙互浼犲叆鏂扮殑鏁版嵁杩涜璁＄畻銆備緥濡傦紝鍙互浣跨敤浠ヤ笅浠ｇ爜閲嶇疆MessageDigest瀵硅薄鐨勭姸鎬侊細

md.reset();

3. 浣跨敤update鏂规硶浼犲叆瑕佽绠楁憳瑕佺殑鏁版嵁銆傚彲浠ヤ竴娆′紶鍏ユ暣涓暟鎹紝涔熷彲浠ュ娆′紶鍏ラ儴鍒嗘暟鎹€備緥濡傦紝鍙互浣跨敤浠ヤ笅浠ｇ爜浼犲叆瑕佽绠楁憳瑕佺殑瀛楃涓叉暟鎹細

md.update("Hello, world!".getBytes());

4. 璋冪敤digest鏂规硶璁＄畻鎽樿銆傝鏂规硶杩斿洖璁＄畻寰楀埌鐨勬憳瑕佸瓧鑺傛暟缁勩€備緥濡傦紝鍙互浣跨敤浠ヤ笅浠ｇ爜璁＄畻鎽樿锛?/li>

byte[] digest = md.digest();

5. 鍙€夛細瀵硅绠楀緱鍒扮殑鎽樿杩涜鏍煎紡鍖栥€備緥濡傦紝鍙互浣跨敤浠ヤ笅浠ｇ爜灏嗘憳瑕佽浆鎹负16杩涘埗瀛楃涓诧細

StringBuilder sb = new StringBuilder();
for (byte b : digest) {
sb.append(String.format("%02x", b));
}
String hexDigest = sb.toString();

瀹屾暣鐨勭ず渚嬩唬鐮佸涓嬶細

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MessageDigestExample {
public static void main(String[] args) {
try {
// 鑾峰彇MessageDigest瀵硅薄
MessageDigest md = MessageDigest.getInstance("MD5");
// 閲嶇疆MessageDigest瀵硅薄鐨勭姸鎬?/span>
md.reset();
// 浼犲叆瑕佽绠楁憳瑕佺殑鏁版嵁
md.update("Hello, world!".getBytes());
// 璁＄畻鎽樿
byte[] digest = md.digest();
// 鏍煎紡鍖栨憳瑕佷负16杩涘埗瀛楃涓?/span>
StringBuilder sb = new StringBuilder();
for (byte b : digest) {
sb.append(String.format("%02x", b));
}
String hexDigest = sb.toString();
System.out.println("鎽樿锛?quot; + hexDigest);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
}

杩愯浠ヤ笂浠ｇ爜锛屽皢浼氳緭鍑鸿绠楀緱鍒扮殑MD5鎽樿銆?/p>

娉ㄦ剰锛氬湪浣跨敤MessageDigest瀵硅薄璁＄畻鎽樿涔嬪悗锛屼笉鑳藉啀娆′娇鐢ㄨ瀵硅薄璁＄畻鎽樿锛屽惁鍒欎細寰楀埌閿欒鐨勭粨鏋溿€傚鏋滈渶瑕佽绠楀涓暟鎹殑鎽樿锛岄渶瑕佷负姣忎釜鏁版嵁鍒涘缓涓€涓柊鐨凪essageDigest瀵硅薄銆?/p>