给我一个java类型的方法

以下是一个Java类型的方法，用于调用钉钉上传媒体文件接口，并返回上传成功的文件的唯一标识符 media_id：

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Base64;

import okhttp3.*;

public class DingTalkMediaUpload {
    private final OkHttpClient httpClient = new OkHttpClient();

    public String uploadMedia(String accessToken, String type, File file) throws IOException {
        // Step 1: 获取上传媒体文件的上传地址
        String uploadUrl = "https://oapi.dingtalk.com/media/upload?access_token=" + accessToken + "&type=" + type;
        Request request = new Request.Builder().url(uploadUrl).post(new MultipartBody.Builder()
                .setType(MultipartBody.FORM).addFormDataPart("media", file.getName(),
                        RequestBody.create(MediaType.parse("application/octet-stream"),
                                Base64.getEncoder().encodeToString(Files.readAllBytes(file.toPath()))))
                .build()).build();
        Response response = httpClient.newCall(request).execute();
        if (!response.isSuccessful()) {
            throw new IOException("Unexpected HTTP status code: " + response.code());
        }
        String responseBody = response.body().string();
        response.close();

        // Step 2: 解析上传成功的结果，获取media_id
        return JsonPath.read(responseBody, "$.media_id");
    }

    public static void main(String[] args) throws IOException {
        DingTalkMediaUpload uploader = new DingTalkMediaUpload();
        String accessToken = "YOUR_ACCESS_TOKEN";
        String type = "image";
        File file = new File("path/to/your/file.png");
        String mediaId = uploader.uploadMedia(accessToken, type, file);
        System.out.println("Media Id: " + mediaId);
    }
}

注意替换代码中的 YOUR_ACCESS_TOKEN 和 path/to/your/file.png 为自己的实际值。另外，需要引入 okhttp3 和 json-path 库才能正常编译运行。