最近遇到一個問題，通過Azure的Java類庫上傳檔案到Azure blob，但是客戶環境通過Proxy上網的，這就需要通過代理連線blob。
官方文件裡都沒有提及如何通過代理上傳，解決這個問題浪費了一些時間，在這裡記錄一下。
Maven引用最新版本的Azure類庫

<dependencies>
      <dependency>
          <groupId>com.azure</groupId>
          <artifactId>azure-storage-blob</artifactId>
          <
 
version>12.8.0</version>
      </dependency>      
    <dependency>
        <groupId>com.microsoft.azure</groupId>
        <artifactId>azure-storage</artifactId>
        <version>8.6.5</version>
    </dependency>
<dependency>

呼叫程式碼如下：

import
 
 java.net.Authenticator;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import com.azure.core.http.HttpClient;
import com.azure.core.http.ProxyOptions;
import com.azure.core.http.netty.NettyAsyncHttpClientBuilder;
import com.azure.storage.blob.BlobClient;
import com.azure.storage.blob.BlobClientBuilder;
 
public class BlobUpload {
    
    //TODO：填寫正確的代理資訊
    private String ProxyAddress = "";
    private int ProxyPort = 0;
    //TODO:填寫正確的使用者名稱和密碼
    private String ProxyUserName = "";
    private String ProxyPassword = "";
    
    //TODO:填寫正確的Blob資訊
    private String ConnectStr = "";
    private String ContainerName = "";
    private String BlobName = "";
    
    //TODO:填寫要上傳的檔名字
    private String LocalFileName = "";
    
    public static void main(String args[]) throws Exception {      
        try {            
            new BlobUpload().upload();    
            System.out.println("上傳成功。");
        }
        catch(Exception ex){
            ex.printStackTrace();
        }
    }    
    private void upload() {
        this.getBlobClient().uploadFromFile(LocalFileName, true);
    }
    
    private BlobClient getBlobClient() {
        return new BlobClientBuilder()
                .connectionString(ConnectStr)                
                .containerName(ContainerName)
                .blobName(BlobName)
                .httpClient(this.getHttpClient())
                .buildClient();                
    }
    
    private HttpClient getHttpClient() {
        NettyAsyncHttpClientBuilder builder = new NettyAsyncHttpClientBuilder();    
        ProxyOptions proxy = new ProxyOptions(ProxyOptions.Type.HTTP, new InetSocketAddress(ProxyAddress, ProxyPort));                
        Authenticator authenticator = new Authenticator(){
            public PasswordAuthentication getPasswordAuthentication() {
            return (new PasswordAuthentication(ProxyUserName, ProxyPassword.toCharArray()));
            }
        };
        Authenticator.setDefault(authenticator);
        return builder.proxy(proxy).build();        
    }
}