1.RSA公钥私钥生成工具类

/**
 * RSA密钥对生成工具类
 */
public class KeyPairGeneratorUtil {
    public static KeyPair generateRSAKeyPair() {
        try{
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(2048);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            return keyPair;
        }catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static PublicKey getPublicKey(KeyPair keyPair) {
        return keyPair.getPublic();
    }

    public static PrivateKey getPrivateKey(KeyPair keyPair) {
        return keyPair.getPrivate();
    }
}

2.RSA公钥后台请求接口

@RestController
public class RsaController {
    private static KeyPair keyPair = KeyPairGeneratorUtil.generateRSAKeyPair();
    //私钥
    public static PrivateKey privateKey = KeyPairGeneratorUtil.getPrivateKey(keyPair);
    //公钥
    private static String publicKeyString = Base64.getEncoder().encodeToString(keyPair.getPublic().getEncoded());

    @RequestMapping("/getPublicKey")
    public Map<String,Object> getPublicKeyBase64(){
        Map<String,Object> ret = new HashMap<>();
        ret.put("publicKey",publicKeyString);
        return ret;
    }
}

3.前端页面引用jsencrypt.js（vue需要执行npm install jsencrypt安装，js文件获取则可以利用vue项目npm install安装后在本地modules里找到对应的js文件拷贝到自己的项目里引用）
4.RSA加密，js登录请求前用公钥对密码进行加密

//获取公钥
    $.ajax({
        url : '/getPublicKey',
        type : 'POST',
        dataType : 'json',
        data : { },
        success : function (data, status, xhr) {
            let pass = $.trim($("#password").val());
            pwdcache = pass;
            let publicKey = data.publicKey;
            console.log(data.publicKey)
            // 获取密码对象
            let encryptor = new JSEncrypt();
            // 放入公钥
            encryptor.setPublicKey(publicKey)
            // 放入加密的内容并加密
            let passByPublicKey = encryptor.encrypt(pass);
            // 加密后的密文
            $("#password").val(passByPublicKey);
            $("#login").click();
        },
        error : function () {
        }
    });

5.RSA解密，登录密码校验逻辑之前对密码进行解密（根据数据库存储密码的加密格式需要转换为对应的，方便后面校验）

public String decrypt(String encryptedData) {
        byte[] decodedData = java.util.Base64.getDecoder().decode(encryptedData);
        try {
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] decryptedData = cipher.doFinal(decodedData);
            return new String(decryptedData);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }