如何使用HTTP GET请求访问鉴权图片的URL？

以下代码用于生成以GET方法访问的签名URL。
```import com.aliyun.oss.;
import com.aliyun.oss.common.auth.;
import java.net.URL;
import java.util.Date;
import java.util.Date;

public class Demo {
public static void main(String[] args) throws Throwable {
// 以华东1（杭州）的外网Endpoint为例，其它Region请按实际情况填写。
String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
// 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
// 填写Bucket名称，例如examplebucket。
String bucketName = "examplebucket";
// 填写Object完整路径，例如exampleobject.txt。Object完整路径中不能包含Bucket名称。
String objectName = "exampleobject.txt";

    // 创建OSSClient实例。
    OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

    try {
        // 设置签名URL过期时间，单位为毫秒。本示例以设置过期时间为1小时为例。
        Date expiration = new Date(new Date().getTime() + 3600 * 1000L);
        // 生成以GET方法访问的签名URL，访客可以直接通过浏览器访问相关内容。
        URL url = ossClient.generatePresignedUrl(bucketName, objectName, expiration);
        System.out.println(url);
    } catch (OSSException oe) {
        System.out.println("Caught an OSSException, which means your request made it to OSS, "
                + "but was rejected with an error response for some reason.");
        System.out.println("Error Message:" + oe.getErrorMessage());
        System.out.println("Error Code:" + oe.getErrorCode());
        System.out.println("Request ID:" + oe.getRequestId());
        System.out.println("Host ID:" + oe.getHostId());
    } catch (ClientException ce) {
        System.out.println("Caught an ClientException, which means the client encountered "
                + "a serious internal problem while trying to communicate with OSS, "
                + "such as not being able to access the network.");
        System.out.println("Error Message:" + ce.getMessage());
    } finally {
        if (ossClient != null) {
            ossClient.shutdown();
        }
    }
}

}
```

参考文档https://help.aliyun.com/zh/oss/developer-reference/authorize-access-1?spm=a2c4g.11186623.0.i7