发布base64Image

Question

我试图将两个字符串和一个* .jpg（Base64）文件发布到Spring servlet，我收到了一个http 400错误，我知道这个错误是由于@RequestParam被设置为required = true

@RequestMapping(value = "blurred-url/start", method = RequestMethod.POST)
public ResponseEntity<String> start(@RequestParam(value = "base64Image", required = true) final String base64Image,
                                        @RequestParam(value = "transactionId", required = true) final String transactionId,
                                        @RequestParam(value = "counterSignature", required = true) final String counterSignature)

我使用以下代码将图像文件编码为Base64（现在为硬编码）

public static String getImage(){

        File file = new File("c://nota.jpg");

        byte[] imageByteArray = null;
        String imageDataString = null;

        try {            

            FileInputStream imageInFile = new FileInputStream(file);
            byte imageData[] = new byte[(int) file.length()];

            imageInFile.read(imageData);
            imageDataString = encodeImage(imageData);

        } catch (IOException e) {
            e.printStackTrace();
        }

        return imageDataString;

    }

     /**
     * Encodes the byte array into base64 string
     *
     * @param imageByteArray - byte array
     * @return String a {@link java.lang.String}
     */
    public static String encodeImage(byte[] imageByteArray) {
        return Base64.encodeBase64URLSafeString(imageByteArray);
    }

我已经尝试过使用Apache HttpClient的许多不同方法，现在我正在使用MultipartEntityBuilder，但仍然无法使其正常工作，代码如下

CloseableHttpClient httpclient = HttpClients.createDefault();

        try {
            HttpPost httppost = new HttpPost("http://localhost:8080/server-name/" +
                    "blurred-url.action");

            StringBody base64Image = new StringBody("123", ContentType.TEXT_HTML);
            StringBody transactionId = new StringBody(jsonObj.get("signature").getAsString(), ContentType.TEXT_PLAIN);
            StringBody signature = new StringBody(jsonObj.get("signature").getAsString(), ContentType.TEXT_PLAIN);

            HttpEntity reqEntity = MultipartEntityBuilder.create()
                    .addPart("base64Image", base64Image)
                    .addPart("counterSignature", signature)
                    .addPart("transactionId", transactionId)
                    .build();

            httppost.setEntity(reqEntity);

            CloseableHttpResponse response = httpclient.execute(httppost);

            try {

                if(response.getStatusLine().getStatusCode() == 200){

                    HttpEntity resEntity = response.getEntity();

                    if (resEntity != null) {
                        System.out.println("Response content length: " + resEntity.getContentLength());
                    }
                    EntityUtils.consume(resEntity);

                    JsonObject jsPost = getJsonObjectFromStream(resEntity.getContent());

                    System.out.println("success: "+jsPost.get("success"));

                }else{
                    HttpEntity resEntity = response.getEntity();

                    StringWriter writer = new StringWriter();
                    IOUtils.copy(resEntity.getContent(), writer,Charset.defaultCharset());

                    System.out.println(response.getStatusLine());
                    System.err.println(writer.toString());
                }
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }

我认为文件的大小有问题，我认为，因为如果我只是将图像编码的字符串更改为更短的字符串，如＆＃34; 123＆＃34;请求通过，现在我正在使用400 KB图像，任何想法？