通过url获取流将该流以zip形式输出

可以使用Java中的ZipOutputStream类将一个流以zip形式输出。可以按照以下步骤实现：

1. 通过URL获取输入流

URL url = new URL("http://example.com/file.zip");
InputStream in = url.openStream();

2. 创建ZipOutputStream并设置输出流

ZipOutputStream out = new ZipOutputStream(new FileOutputStream("output.zip"));

3. 将获取到的流写入到ZipOutputStream中

out.putNextEntry(new ZipEntry("file.zip"));
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buffer)) > 0) {
    out.write(buffer, 0, len);
}

4. 关闭输入流和ZipOutputStream

in.close();
out.closeEntry();
out.close();

完整示例代码如下：

import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Main {
    public static void main(String[] args) throws Exception {
        URL url = new URL("http://example.com/file.zip");
        InputStream in = url.openStream();
        ZipOutputStream out = new ZipOutputStream(new FileOutputStream("output.zip"));
        out.putNextEntry(new ZipEntry("file.zip"));
        byte[] buffer = new byte[1024];
        int len;
        while ((len = in.read(buffer)) > 0) {
            out.write(buffer, 0, len);
        }
        in.close();
        out.closeEntry();
        out.close();
    }
}

运行该程序后，会将获取到的流以zip形式输出到当前目录下的output.zip文件中。