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A single bundled dependency that includes all service and dependent JARs with third-party libraries relocated to different namespaces.

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package com.qcloud.cos.demo;

import java.io.File;

import com.qcloud.cos.COSClient;
import com.qcloud.cos.ClientConfig;
import com.qcloud.cos.auth.BasicCOSCredentials;
import com.qcloud.cos.auth.COSCredentials;
import com.qcloud.cos.model.GetObjectRequest;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.region.Region;

public class GetObjectDemo {
    public static void main(String[] args) {
        GetObjectToFileDemo();
    }

    public static void GetObjectToFileDemo() {
        // 初始化用户身份信息(secretId, secretKey)
        COSCredentials cred = new BasicCOSCredentials("AKIDXXXXXXXX","1A2Z3YYYYYYYYYY");
        // 设置bucket的区域, COS地域的简称请参照 https://www.qcloud.com/document/product/436/6224
        ClientConfig clientConfig = new ClientConfig(new Region("ap-guangzhou"));
        // 生成cos客户端
        COSClient cosclient = new COSClient(cred, clientConfig);
        String key = "test/my_test.json";
        String bucketName = "mybucket-1251668577";
        boolean useTrafficLimit = false;
        GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, key);
        if(useTrafficLimit) {
            getObjectRequest.setTrafficLimit(8*1024*1024);
        }
        File localFile = new File("my_test.json");
        ObjectMetadata objectMetadata = cosclient.getObject(getObjectRequest, localFile);
        System.out.println(objectMetadata.getContentLength());
    }
}