java压缩文件参考：http://www.jiajiajia.club/blog/artical/1en1qpemej45/499

一、pom

<dependency>
    <groupId>com.aliyun.oss</groupId>
    <artifactId>aliyun-sdk-oss</artifactId>
    <version>2.2.3</version>
</dependency>

二、java代码

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.OSSObject;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.Adler32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class OssDownload {

    public static void main(String[] args) {

        String file = "D://data//downForZip.zip";

        List<String> list = new ArrayList();
        list.add("1.png");
        list.add("2.png");
        downForZip(list,file);
    }

    /**
     * 批量下载为zip
     * @param keyList oss文件路径集合
     * @param fileName 下载出来的zip文件名(一般以合同名命名) 如：测试合同,zip
     */
    public static void downForZip(List<String> keyList, String fileName){
        File zipFile = null;
        try {
            zipFile = File.createTempFile("test", ".zip");
            FileOutputStream f = new FileOutputStream(zipFile);
            CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());
            ZipOutputStream zos = new ZipOutputStream(csum);
            OSSClient ossClient= new OSSClient(
                    "endpoint",
                    "accessKeyId",
                    "secretAccessKey");
            for (String ossFile : keyList) {
                OSSObject ossObject = ossClient.getObject("bucketName", ossFile);
                InputStream inputStream = ossObject.getObjectContent();
                String name=ossFile.substring(ossFile.lastIndexOf("/")+1);
                zos.putNextEntry(new ZipEntry(name));
                int bytesRead = 0;
                while ((bytesRead = inputStream.read()) != -1) {
                    zos.write(bytesRead);
                }
                inputStream.close();
                zos.closeEntry();
            }
            zos.close();
            FileInputStream fis = new FileInputStream(zipFile);
            BufferedInputStream buff = new BufferedInputStream(fis);
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(fileName)));
            byte[] car = new byte[1024];
            int l = 0;
            while (l < zipFile.length()) {
                int j = buff.read(car, 0, 1024);
                l += j;
                out.write(car, 0, j);
            }
            fis.close();
            buff.close();
            out.close();
            ossClient.shutdown();
            zipFile.delete();
        } catch (IOException e1) {
            e1.printStackTrace();
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
}