JAVA生成RSA公私钥对代码记录

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.Base64;
 
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Base64;
 
public class RSAKeyGenerator {
    public static void main(String[] args) throws Exception {
        // 生成RSA密钥对
        // 目前看algorithm有三种，DiffieHellman、DSA、RSA
        // 可参考：https://m.runoob.com/manual/jdk1.6/java.base/java/security/KeyPairGenerator.html
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048); // 设置密钥长度，一般使用2048位
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
 
        // 获取公钥和私钥
        PublicKey publicKey = keyPair.getPublic();
        PrivateKey privateKey = keyPair.getPrivate();
 
        // 将公钥和私钥转换成Base64编码字符串保存到文件中
        String publicKeyString = Base64.getEncoder().encodeToString(publicKey.getEncoded());
        String privateKeyString = Base64.getEncoder().encodeToString(privateKey.getEncoded());
 
        // 保存公钥和私钥到文件
        Files.write(Paths.get("public_key.pem"), publicKeyString.getBytes());
        Files.write(Paths.get("private_key.pem"), privateKeyString.getBytes());
    }
}