How to use Java to upload and download files through Qiniu Cloud?

How to use Java to upload and download files through Qiniu Cloud?

Qiniu Cloud is a leading cloud storage solution provider, providing powerful file upload and download functions. In Java development, it is very convenient to upload and download files through Qiniu Cloud. This article will introduce in detail how to use Java to upload and download files through Qiniu Cloud, and provide corresponding code examples.

1. Preparation
Before we start, we need to prepare some necessary things.

1. Qiniu Cloud account: Visit Qiniu Cloud official website (https://www.qiniu.com/), register and log in to your account. Create a new storage space and obtain AccessKey and SecretKey.

　2. Java development environment: Make sure you have installed the Java development environment.

3. Maven dependencies: In the project's pom.xml file, add the following dependencies:

<dependencies>
  <dependency>
    <groupId>com.qiniu</groupId>
    <artifactId>qiniu-java-sdk</artifactId>
    <version>[7.2.3, 7.2.3]</version>
  </dependency>
</dependencies>

2. Upload files
To upload files using Qiniu Cloud, authentication is required. First, we need to create an Auth object for authorization verification. The code example is as follows:

import com.qiniu.util.Auth;

public class QiniuUploadExample {

  public static void main(String[] args) {
    String accessKey = "Your_Access_Key";
    String secretKey = "Your_Secret_Key";
    String bucket = "Your_Bucket_Name";
    String localFilePath = "Path_To_Local_File";

    Auth auth = Auth.create(accessKey, secretKey);
    String uploadToken = auth.uploadToken(bucket);

    // 此处可添加其他参数，如指定存储空间的域名
    // Configuration cfg = new Configuration(Zone.zone0());

    UploadManager uploadManager = new UploadManager();

    try {
      Response response = uploadManager.put(localFilePath, null, uploadToken);
      // 解析上传成功的结果
      DefaultPutRet putRet = new Gson().fromJson(response.bodyString(), DefaultPutRet.class);
      System.out.println(putRet.key);
      System.out.println(putRet.hash);
    } catch (QiniuException ex) {
      Response r = ex.response;
      System.err.println(r.toString());
      try {
        System.err.println(r.bodyString());
      } catch (QiniuException ex2) {
        // ignore
      }
    }
  }
}

In the above code, we need to replace parameters such as AccessKey, SecretKey, Bucket, and LocalFilePath. The AccessKey and SecretKey are obtained from the Qiniu Cloud Console, Bucket is the name of the storage space, and LocalFilePath is the path of the local file to be uploaded.

In addition, we can also set the domain name of the storage space. This can be achieved through the following code:

Configuration cfg = new Configuration(Zone.zone0());

3. Download files
Using Qiniu Cloud to download files also requires identity verification. You also need to create an Auth object for authorization verification. The code example is as follows:

import com.qiniu.util.Auth;
import com.qiniu.util.StringMap;

public class QiniuDownloadExample {

  public static void main(String[] args) {
    String accessKey = "Your_Access_Key";
    String secretKey = "Your_Secret_Key";
    String domain = "Your_Domain";
    String fileName = "Your_File_Name";

    Auth auth = Auth.create(accessKey, secretKey);
    StringMap map = new StringMap();
    String downloadUrl = auth.privateDownloadUrl(domain + "/" + fileName, 3600, map);

    System.out.println(downloadUrl);
  }
}

Similarly, we need to replace parameters such as AccessKey, SecretKey, Domain and FileName. The AccessKey and SecretKey are obtained from Qiniu Cloud Console, Domain is the domain name of the storage space, and FileName is the file name of the file to be downloaded.

Summary
This article introduces in detail how to use Java to upload and download files through Qiniu Cloud, and provides corresponding code examples. Through the powerful functions of Qiniu Cloud, we can easily upload and download files, which provides great convenience for our development work. I hope this article can be helpful to everyone.

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