我有一個(gè)像這樣的 Diffie-Hellman 安全類：public class AESSecurityCap {    private PublicKey publicKey;    KeyAgreement keyAgreement;    byte[] sharedsecret;    AESSecurityCap() {        makeKeyExchangeParams();    }    private void makeKeyExchangeParams() {        KeyPairGenerator kpg = null;        try {            kpg = KeyPairGenerator.getInstance("EC");            kpg.initialize(128);            KeyPair kp = kpg.generateKeyPair();            publicKey = kp.getPublic();            keyAgreement = KeyAgreement.getInstance("ECDH");            keyAgreement.init(kp.getPrivate());        } catch (NoSuchAlgorithmException | InvalidKeyException e) {            e.printStackTrace();        }    }    public void setReceiverPublicKey(PublicKey publickey) {        try {            keyAgreement.doPhase(publickey, false);  // <--- Error on this line            sharedsecret = keyAgreement.generateSecret();        } catch (InvalidKeyException e) {            e.printStackTrace();        }    }} 并實(shí)現(xiàn)了這個(gè)類：public class Node extends AESSecurityCap {}有時(shí)我需要重新初始化 DH keyAgreement：public class TestMainClass {    public static void main(String[] args) {        Node server = new Node();        Node client = new Node();        server.setReceiverPublicKey(client.getPublicKey());        client.setReceiverPublicKey(server.getPublicKey());        // My problem is this line ,        // Second time result exception        server.setReceiverPublicKey(client.getPublicKey());     }}有沒有辦法多次重新初始化ECDH KeyAgreement？這是我的測(cè)試用例：客戶端初始化DH并生成公鑰?？蛻舳藢⒐€發(fā)送到服務(wù)器。服務(wù)器用客戶端密鑰初始化DH并生成自己的公鑰并生成共享密鑰。服務(wù)器將公鑰發(fā)送給客戶端?？蛻舳耸褂梅?wù)器公鑰生成共享密鑰。在此步驟中，客戶端和服務(wù)器具有公鑰和共享秘密。我的問題是客戶端斷開連接（）和 KeyAgreement 由單例對(duì)象初始化，并且不會(huì)第二次重新初始化。有時(shí)我需要做這個(gè)課題。請(qǐng)指導(dǎo)我解決這個(gè)問題。