Rest 如何将新头添加到jersey客户端以上载多部分文件

请查找以下jersey客户端代码以上载多部分文件：

String url = "http://localhost:7070"
Client client = Client.create();
WebResource webresource = client.resource(url);
File file = new File("C://Data//image1.jpg");
File thumbnail = new File("C://Data/image2.jpg");


InputStream isthumbnail = new FileInputStream(thumbnail);
InputStream isfile = new FileInputStream(file);

FormDataMultiPart multiPart = new FormDataMultiPart();
FormDataBodyPart bodyPart1 = new FormDataBodyPart(FormDataContentDisposition.name("Thumbnail").fileName("thumbnail").build(), isthumbnail, MediaType.APPLICATION_OCTET_STREAM_TYPE);
FormDataBodyPart bodyPart2 = new FormDataBodyPart(FormDataContentDisposition.name("File").fileName("file").build(), isfile, MediaType.APPLICATION_OCTET_STREAM_TYPE);
multiPart.bodyPart(bodyPart);
multiPart.bodyPart(bodyPart1);

//New Headers
String fileContentLength = "form-data; contentLength=\""+Long.toString(file.length())+ "\"";
String thumbnailContentLength = "form-data; contentLength=\""+Long.toString(file.length())+ "\"";

final ClientResponse clientResp = webresource.type(MediaType.MULTIPART_FORM_DATA_TYPE).accept(MediaType.APPLICATION_XML).post(ClientResponse.class, multiPart);
System.out.println("File Upload Success with Response"+clientResp.getStatus());

我需要添加字符串fileContentLength和thumbnailContentLength作为标题 内容长度。 如何将标题添加为multipart的一部分并发布请求？如有任何帮助，请使用a作为参数

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因此，添加.size给了我类似于dispo{form data；“filename=“test.txt”；size=31；name=“file”}的东西。我必须执行bodyPart.getHeaders（）.add（“Content Length”，String.valueOf（value.getBytes（）.Length））；

final FormDataMultiPart formDataMultiPart = new FormDataMultiPart();
final String value = "Hello World";
final FormDataContentDisposition dispo = FormDataContentDisposition
        .name("file")
        .fileName("test.txt")
        .size(value.getBytes().length)
        .build();
final FormDataBodyPart bodyPart = new FormDataBodyPart(dispo, value);
formDataMultiPart.bodyPart(bodyPart);