java实现oss上传文件单例模式写法

在Java中实现OSS（Object Storage Service）上传文件的单例模式，通常是为了保证在整个应用中只有一个实例，并提供统一的操作接口。下面是一个简单的Spring Boot风格的阿里云OSS上传文件单例模式示例：

import com.aliyun.oss.OSS;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component("ossClient")
public class OssSingleton {
    private static volatile OssSingleton instance;
    private OSS ossClient;

    // 防止直接new创建对象，通过getInstance()获取唯一实例
    private OssSingleton() {
        @Autowired
        private void init(AliyunCredentials credentials) {
            String endpoint = "your_oss_endpoint";
            String bucketName = "your_bucket_name";
            ossClient = new OSS(credentials.getAccessKeyId(), credentials.getAccessKeySecret(), endpoint, bucketName);
        }
    }

    public static OssSingleton getInstance() {
        if (instance == null) {
            synchronized (OssSingleton.class) {
                if (instance == null) {
                    instance = new OssSingleton();
                }
            }
        }
        return instance;
    }

    public OSS getClient() {
        return ossClient;
    }