我曾经有应用程序登录与给定的用户与他的凭据-

AWSCognitoIdentityProvider cognitoIdentityProvider = AWSCognitoIdentityProviderClientBuilder
                .standard()
                .withCredentials(new AWSStaticCredentialsProvider(getSDKCredentials()))
                .withRegion(Regions.fromName(getAwsRegion()))
                .build();

    Map<String,String> params =new HashMap<>();
        params.put("USERNAME", userName);
        params.put("PASSWORD", passCode);

    AdminInitiateAuthRequest initialRequest=new AdminInitiateAuthRequest()
            .withAuthFlow(AuthFlowType.ADMIN_NO_SRP_AUTH)
            .withAuthParameters(params)
            .withClientId(getClientId())
            .withUserPoolId(getUserPoolId());

    AdminInitiateAuthResult response = cognitoIdentityProvider.adminInitiateAuth(initialRequest);

这将返回您的响应，您有会话。看看有没有帮助-

AdminInitiateAuthResult authResult = client.adminInitiateAuth(authRequest);
AuthenticationResultType resultType = authResult.getAuthenticationResult();
vars.put("AccessToken",resultType.getAccessToken());
vars.put("RefreshToken",resultType.getRefreshToken());
vars.put("IdToken",resultType.getIdToken());