JAVA，NET RSA密钥格式转换

在Java中，可以通过以下方式将RSA密钥转换为不同的格式：

1. 将RSA密钥转换为PKCS#8格式的私钥：

PrivateKey privateKey = ... // 获取RSA私钥
byte[] pkcs8Bytes = privateKey.getEncoded();
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(pkcs8Bytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey newPrivateKey = keyFactory.generatePrivate(pkcs8KeySpec);

2. 将RSA密钥转换为PKCS#1格式的私钥：

PrivateKey privateKey = ... // 获取RSA私钥
byte[] pkcs1Bytes = privateKey.getEncoded();
PKCS1EncodedKeySpec pkcs1KeySpec = new PKCS1EncodedKeySpec(pkcs1Bytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey newPrivateKey = keyFactory.generatePrivate(pkcs1KeySpec);

3. 将RSA密钥转换为X.509格式的公钥：

PublicKey publicKey = ... // 获取RSA公钥
byte[] x509Bytes = publicKey.getEncoded();
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(x509Bytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey newPublicKey = keyFactory.generatePublic(x509KeySpec);

4. 将RSA密钥转换为PEM格式的字符串：

PrivateKey privateKey = ... // 获取RSA私钥
PublicKey publicKey = ... // 获取RSA公钥

Base64.Encoder encoder = Base64.getEncoder();
String privateKeyStr = encoder.encodeToString(privateKey.getEncoded());
String publicKeyStr = encoder.encodeToString(publicKey.getEncoded());

String pemPrivateKey = "-----BEGIN PRIVATE KEY-----\n" + privateKeyStr + "\n-----END PRIVATE KEY-----";
String pemPublicKey = "-----BEGIN PUBLIC KEY-----\n" + publicKeyStr + "\n-----END PUBLIC KEY-----";

以上代码仅供参考，具体实现方式还需要根据实际情况进行调整。