Java中五种最常见加密算法

在Java中，最常见的加密算法包括：

1. AES (Advanced Encryption Standard)
2. DES (Data Encryption Standard)
3. 3DES
4. RSA
5. MD5 (Message Digest 5)

以下是每种算法的简单示例代码：

1. AES加密：

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
 
public class AESEncryption {
    public static String encrypt(String data, String key) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key.getBytes(), "AES"));
        return Base64.getEncoder().encodeToString(cipher.doFinal(data.getBytes()));
    }
}

2. DES加密：

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
 
public class DESEncryption {
    public static String encrypt(String data, String key) throws Exception {
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key.getBytes(), "DES"));
        return Base64.getEncoder().encodeToString(cipher.doFinal(data.getBytes()));
    }
}

3. 3DES加密：

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
 
public class TripleDESEncryption {
    public static String encrypt(String data, String key) throws Exception {
        Cipher cipher = Cipher.getInstance("DESede");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key.getBytes(), "DESede"));
        return Base64.getEncoder().encodeToString(cipher.doFinal(data.getBytes()));
    }
}

4. RSA加密：

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.util.Base64;
 
import javax.crypto.Cipher;
 
public class RSAEncryption {
    public static String encrypt(String data, String publicKey) throws Exception {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, KeyPairGenerator.getInstance("RSA").generatePublic(new X509EncodedKeySpec(Base64.getDecoder().decode(publicKey))));
        return Base64.getEncoder().encodeToString(cipher.doFinal(data.getBytes()));
    }
}

5. MD5加密：

import java.security.MessageDigest;
 
public class MD5Encryption {
    public static String encrypt(String data) throws Exception {
        MessageDigest md = MessageDigest.getInstance("MD5