支付宝小程序获取用户唯一 ID的方法

以下示例由JAVA编写，请求成功后将返回user_id字段。

AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","GBK","alipay_public_key","RSA2");
AlipaySystemOauthTokenRequest request = new AlipaySystemOauthTokenRequest();
request.setGrantType("authorization_code");
request.setCode("4b203fe6c11548bcabd8da5bb087a83b");
request.setRefreshToken("201208134b203fe6c11548bcabd8da5bb087a83b");
AlipaySystemOauthTokenResponse response = alipayClient.execute(request);
if(response.isSuccess()){
    System.out.println("调用成功");
} else {
    System.out.println("调用失败");
}