Question

我只是尝试从我的Java AWS Lambda函数调用外部Web服务。要做到这一点，我无法让org.apache.http客户端工作。我有代码：

public static String get(String get) throws ClientProtocolException, IOException{
    RequestConfig defaultRequestConfig = RequestConfig.custom().setExpectContinueEnabled(true).build();
    HttpGet httpGetRequest = new HttpGet(get);
    RequestConfig requestConfig = RequestConfig.copy(defaultRequestConfig).setSocketTimeout(5000).setConnectTimeout(5000).setConnectionRequestTimeout(5000).build();
    httpGetRequest.setConfig(requestConfig);

    CloseableHttpClient httpClient = HttpClientBuilder.create().build();
    HttpResponse httpResponse = httpClient.execute(httpGetRequest); <<<<<
    HttpEntity entity = httpResponse.getEntity();
    StringBuffer all = new StringBuffer();
    if (entity != null) {
        InputStream inputStream = entity.getContent();
        BufferedReader in = new BufferedReader(new InputStreamReader(new BufferedInputStream(inputStream)));
        String read;
        while ((read = in.readLine()) != null){
            all.append(read);
            all.append("\n");
        }
        httpClient.close();
    }
    return all.toString();
}

部署后，它会挂在上面的HttpResponse httpResponse = httpClient.execute(httpGetRequest); <<<<<行。

我可以通过设置Socket连接来证明我有从lambda函数到互联网的连接，例如Socket s = new Socket(InetAddress.getByName("bbc.co.uk"), 80);我可以通过这种方式检索数据。

所以问题是第一个代码片段在本地工作但在部署时没有问题？或者是否有一种从Java调用AWS lambda函数的Web服务的首选方法（我已经进行了搜索但找不到最佳实践）？如果我能提供帮助，我宁愿不用手工制作HTTP请求。

Answer 1

请尝试使用Rest模板拨打此电话。

Answer 2

这里的问题是Apache HttpClient的使用，这是一个大型库。切换到OkHttp解决了我的情况。

Answer 3

try {
    String url = "baseurl for AWS insatnce +8080/Testing/mailGenration/generate?msg=20;

    logger.log("Building HttpClient......");
    HttpClient client = HttpClientBuilder.create().build();
    HttpGet request = new HttpGet(url);

    HttpResponse response = client.execute(request);
    logger.log("Response Code : " + response.getStatusLine().getStatusCode());
} catch (Exception e) {
    logger.log("Exception in sendhttpclient:" + e);
}

使用Java在AWS Lambda上调用Web服务

3 个答案: