核心类 ZipInputStream 的api文档请参考：
https://nowjava.com/docs/java-api-11/java.base/java/util/zip/ZipInputStream.html

关于zip压缩的代码参考：http://www.jiajiajia.club/blog/artical/1en1qpemej45/499

java代码

import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;

public class ZipInPutTest {
    public static void main(String[] args) throws Exception{

        File file = new File("D:\\data\\ziptest\\test.zip");

        // 文件输入流（需要解压的文件）
        BufferedInputStream bufferedInputStream
                = new BufferedInputStream(
                        new FileInputStream(file));
        ZipInputStream zipInputStream = new ZipInputStream(bufferedInputStream);

        // 压缩文件实例，为了获取ZipEntry的内容
        ZipFile zipFile = new ZipFile(file);

        // 文件解压保存的地方
        String path = "D:\\data\\ziptest\\test\\";

        ZipEntry zipEntry;
        while ((zipEntry=zipInputStream.getNextEntry())!=null){
            // zipEntry 是一个文件夹
            if(zipEntry.isDirectory()){
                File directory = new File(path+zipEntry.getName()+"\\");
                if(!directory.exists()){
                    directory.mkdirs();
                }
            }else{
                // zipEntry 是一个文件
                // outFile 创建并输出到本地文件
                File outFile = new File(path+zipEntry.getName());
                // 文件输出流
                BufferedOutputStream bufferedOutputStream =
                        new BufferedOutputStream(
                                new FileOutputStream(outFile));

                // 获取ZipEntry的文件流
                InputStream inputStream = zipFile.getInputStream(zipEntry);
                byte[] b = new byte[1024];
                int length;
                while ((length=inputStream.read(b))!=-1){
                    // 写入到本地文件
                    bufferedOutputStream.write(b,0,length);
                }
                inputStream.close();
                bufferedOutputStream.close();
            }
        }
        zipInputStream.close();
        bufferedInputStream.close();
        zipFile.close();
    }
}