问使用Image方法调用人脸搜索API的问题？

人脸搜索API提供了两种方式发送HTTp请求，我在使用image方式发送请求之后返回给我这样的结果{"code":3,"message":"invalid request: param error","data":{}}

我的代码是这样的：

public String postfile1(String url, Map<String, String> header, Map<String, String> body, String filename) throws ClientProtocolException, IOException {

HttpPost httpPost = new HttpPost(url);

if(header != null) {

Iterator httpResponse = header.keySet().iterator();

while(httpResponse.hasNext()) {

String code = (String)httpResponse.next();

System.out.println(code);

httpPost.setHeader(code, (String)header.get(code));

}

}

FileInputStream fileInputStream = new FileInputStream(filename);

System.out.println(filename);

System.out.println(fileInputStream.available());

byte[] data = new byte[fileInputStream.available()];

fileInputStream.read(data);

data = new byte[fileInputStream.available()];

System.out.println(new String(data));

ByteArrayBody bab = new ByteArrayBody(data, filename);

System.out.println(bab);

fileInputStream.close();

String appid = "1256567225";

String group_id = "tencent";

StringBody appidBody = new StringBody(appid,ContentType.MULTIPART_FORM_DATA);

System.out.println(appid.toString());

StringBody group_idBody = new StringBody(group_id,ContentType.MULTIPART_FORM_DATA);

HttpEntity reqEntity = MultipartEntityBuilder.create()

.addPart("appid", appidBody)

.addPart("group_id", group_idBody)

.addPart("image",bab).build();

httpPost.setEntity(reqEntity);

CloseableHttpClient httpClient = HttpClients.createDefault();

CloseableHttpResponse response = httpClient.execute(httpPost);

HttpEntity resultEntity = response.getEntity();

String responseMessage = "";

try{

System.out.println("开始解析结果");

if(resultEntity!=null){

InputStream is = resultEntity.getContent();

BufferedReader br = new BufferedReader(new InputStreamReader(is));

StringBuffer sb = new StringBuffer();

String line = "";

while((line = br.readLine()) != null){

sb.append(line);

}

responseMessage = sb.toString();

System.out.println("解析完成，解析内容为"+ responseMessage);

}

EntityUtils.consume(resultEntity);

}finally{

if (null != response){

response.close();

}

}

return responseMessage;

}