Question

我正在尝试将java应用程序连接到betaface的json api。我遇到了一个奇怪的问题，希望你们能帮助我。

我有（丑陋）代码连接到api。这段代码只是为了测试我得到了什么样的响应以及如何处理它。

我构建了一个请求体，将请求体打印到控制台，然后将请求体写入api。问题是响应码是400。

奇怪的是，当我复制请求主体并通过Advanced Rest Client执行它时，它将返回200和预期的主体。我认为问题不在于身体，而是在HTTPUrlConnection的某个地方。

我已经添加了我的测试类来说明问题，你们只需要一个小图像来重现问题。 API密钥是免费使用betaface的api密钥。

非常感谢您给我的任何帮助。

import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Base64;

import javax.imageio.ImageIO;

public class APITest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        try
        {
            new APITest();
        }
        catch(IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public APITest() throws MalformedURLException, IOException {
        String api_key = "d45fd466-51e2-4701-8da8-04351c872236";
        String api_secret = "171e8465-f548-401d-b63b-caf0dc28df5f";
        String urlToConnect = "http://www.betafaceapi.com/service_json.svc/UploadNewImage_File";
        File fileToUpload = new File("C:\\test.jpg");
        byte[] t = getImageBase64ByteArray(fileToUpload);
        String body = "";
        body += "{\"api_key\":\"";
        body += api_key;
        body += "\",\"api_secret\":\"";
        body += api_secret;
        body += "\",\"detection_flags\":\"\",\"imagefile_data\":[";
        for(int i = 0; i < t.length; i++) {
            body += t[i];
            if(i < t.length - 1)
                body += ",";
        }
        body += "],\"original_filename\":\"Test.jpg\"}";
        System.out.println(body);
        HttpURLConnection connection = (HttpURLConnection)new URL(urlToConnect).openConnection();
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setRequestMethod("POST");
        BufferedWriter writer = 
                        new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
        writer.write(body);
        writer.newLine();
        writer.flush();
        writer.close();
        int responseCode = connection.getResponseCode();

        System.out.println(responseCode); // Should be 200
        InputStream errorstream = connection.getErrorStream();
        BufferedReader br = null;
        if (errorstream == null){
            InputStream inputstream = connection.getInputStream();
            br = new BufferedReader(new InputStreamReader(inputstream));
        }else{
            br = new BufferedReader(new InputStreamReader(errorstream));
        }
        String response = "";
        String line;
        while ((line = br.readLine()) != null){
            response += line;
        }
        System.out.println(response);
    }

    public byte[] getImageBase64ByteArray(File file) {
        BufferedImage bufferedImage;
        try
        {
            bufferedImage = ImageIO.read(file);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            String encoded = "";
            try {
            ImageIO.write(bufferedImage, "jpg", bos);
            byte[] imageBytes = bos.toByteArray();
            encoded = Base64.getEncoder().encodeToString(imageBytes);
            bos.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
            return encoded.getBytes();
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        return new byte[0];
    }
}

HttpURLConnection返回400，但请求正文是正确的

0 个答案: