java实现天翼云文件上传下载

要使用Java实现天翼云文件上传和下载，你可以使用天翼云提供的开放API进行操作。以下是一个简单的示例代码，演示了如何使用Java进行天翼云文件上传和下载：

import okhttp3.*;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class TianyiCloudClient {

    private static final String ACCESS_TOKEN = "<Your Access Token>";
    private static final String UPLOAD_URL = "https://api.189.cn/v2/dm/file/upload";
    private static final String DOWNLOAD_URL = "https://api.189.cn/v2/dm/file/download";

    public static void main(String[] args) {
        String filePath = "<Local File Path>";
        String uploadResult = uploadFile(filePath);
        System.out.println("Upload Result: " + uploadResult);

        String fileId = "<File ID>"; // 从上传结果中获取文件ID
        String savePath = "<Save Path>";
        boolean downloadResult = downloadFile(fileId, savePath);
        System.out.println("Download Result: " + downloadResult);
    }

    private static String uploadFile(String filePath) {
        File file = new File(filePath);

        OkHttpClient client = new OkHttpClient();

        RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("file", file.getName(), RequestBody.create(MediaType.parse("application/octet-stream"), file))
                .build();

        Request request = new Request.Builder()
                .url(UPLOAD_URL)
                .addHeader("accessToken", ACCESS_TOKEN)
                .post(requestBody)
                .build();

        try {
            Response response = client.newCall(request).execute();
            if (response.isSuccessful()) {
                return response.body().string();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

    private static boolean downloadFile(String fileId, String savePath) {
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url(DOWNLOAD_URL + "?fileId=" + fileId)
                .addHeader("accessToken", ACCESS_TOKEN)
                .build();

        try {
            Response response = client.newCall(request).execute();
            if (response.isSuccessful()) {
                FileOutputStream fos = new FileOutputStream(savePath);
                fos.write(response.body().bytes());
                fos.close();
                return true;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        return false;
    }
}

在上述代码中，你需要替换以下变量的值：

- `<Your Access Token>`: 你的天翼云访问令牌。
- `<Local File Path>`: 要上传的本地文件路径。
- `<File ID>`: 从上传结果中获取的文件ID。
- `<Save Path>`: 下载文件保存的本地路径。

请确保你已经在天翼云开发者平台注册，并获取到了访问令牌。另外，这只是一个简单示例，实际应用中可能需要添加错误处理和其他功能。