java - 如何使用 apache httpClient API 将文件 + api key 和其他参数作为单个请求发送？

Question

我已经开始测试http客户端apache API。我需要它是因为我想发送请求并接收对virustotal API 的响应。病毒总API要求post请求中的参数:

1. API 键值(每个用户的唯一值)
2. 我从他们的网站上了解到的文件本身。

例如:

>>> url = "https://www.virustotal.com/vtapi/v2/url/scan"
>>> parameters = {"url": "http://www.virustotal.com",
...               "apikey": "-- YOUR API KEY --"}
>>> data = urllib.urlencode(parameters)
>>> req = urllib2.Request(url, data)

目前，我正在尝试用 Java 而不是 Python 来做同样的事情。以下是我的源代码的一部分，经过注释以指导整个步骤:

  CloseableHttpClient httpClient = HttpClientBuilder.create().build();
  //create post request
  HttpPost request = new HttpPost("https://www.virustotal.com/vtapi/v2/file/scan");
  //http json header
  request.addHeader("content-type", "application/json");

  String str  = gson.toJson(param);

  String fileName = UUID.randomUUID().toString() + ".txt";

  try {
    //API key
    StringEntity entity = new StringEntity(str);
    Writer writer = new BufferedWriter(new FileWriter(fileName));
    writer.write(VirusDefinitionTest.malware());
    request.setEntity(entity);
  } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
  MultipartEntityBuilder builder = MultipartEntityBuilder.create();
  FileBody fileBody = new FileBody(new File(fileName)); 

  builder.addTextBody("my_file", fileName);
  HttpEntity entity = builder.build();
  request.setEntity(entity);

  HttpResponse response;
  try {
    response = httpClient.execute(request);

...

不幸的是，我收到 HTTP/1.1 403 Forbidden。显然，错误存在于实体中的某个地方，但我找不到如何做到这一点。任何帮助都将受到热烈欢迎。

Answer 1

这对我使用 Apache 4.5.2 HttpClient 有效:

CloseableHttpClient httpclient = HttpClients.createDefault();
try {
    HttpPost httppost = new HttpPost("https://www.virustotal.com/vtapi/v2/file/scan");

    FileBody bin = new FileBody(new File("... the file here ..."));
    // the API key here
    StringBody comment = new StringBody("5ec8de.....", ContentType.TEXT_PLAIN);

    HttpEntity reqEntity = MultipartEntityBuilder.create()
            .addPart("apikey", comment)
            .addPart("file", bin)
            .build();

    httppost.setEntity(reqEntity);

    System.out.println("executing request " + httppost.getRequestLine());
    CloseableHttpResponse response = httpclient.execute(httppost);
    try {
        System.out.println("----------------------------------------");
        System.out.println(response.getStatusLine());
        HttpEntity resEntity = response.getEntity();
        if (resEntity != null) {
            System.out.println("ToString:" + EntityUtils.toString(resEntity));
        }
        EntityUtils.consume(resEntity);
    } finally {
        response.close();
    }
} finally {
    httpclient.close();
}

重要的部分是 reqEntity，它必须有两个专门命名的字段，“apikey” 和 “file”。使用有效的 API key 运行此命令可以得到 API 的预期响应.