多文件下载并打成zip文件传输到浏览器响应流

import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

@Slf4j
public class FileZipUtil {

    private static final String utf8 = "UTF-8";

    /**
     * 下载zip文件
     * @param srcfile
     * @param zipFileName
     * @param response
     */
    public static void createZipByBytes(List<Map<String, Object>> srcfile, String zipFileName, HttpServletResponse response) {
        byte[] buf = new byte[1024];
        BufferedOutputStream bos;
        InputStream in = null;
        ZipOutputStream out = null;
        try {
            bos = new BufferedOutputStream(response.getOutputStream());
            response.reset();
            response.setCharacterEncoding("utf-8");
            response.addHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Expose-Headers", "*");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(zipFileName, utf8));
            response.setContentType("application/octet-stream;charset=UTF-8");
            out = new ZipOutputStream(bos);
            for (int i = 0; i < srcfile.size(); i++) {
                byte[] bytes = (byte[]) srcfile.get(i).get("content");
                in = new ByteArrayInputStream(bytes);
                out.putNextEntry(new ZipEntry(srcfile.get(i).get("fileName").toString()));
                int len;
                while ((len = in.read(buf)) != -1) {
                    out.write(buf, 0, len);
                }
            }
            out.close();
            bos.close();
            log.info("压缩完成");
        } catch (Exception e) {
            log.error("zip文件打包异常{}",e.getMessage());
            throw new BusinessException("zip文件打包异常");
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    /**
     * 下载zip文件
     * @param srcfile
     * @param zipFileName
     * @param response
     */
    public static void createZipByFiles(List<File> srcfile,String zipFileName,HttpServletResponse response) {
        byte[] buf = new byte[1024];
        // 获取输出流
        BufferedOutputStream bos;
        FileInputStream in = null;
        ZipOutputStream out = null;
        try {
            bos = new BufferedOutputStream(response.getOutputStream());
            response.reset();
            response.setCharacterEncoding("utf-8");
            response.addHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Expose-Headers", "*");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(zipFileName, utf8));
            response.setContentType("application/octet-stream;charset=UTF-8");
            out = new ZipOutputStream(bos);
            for (int i = 0; i < srcfile.size(); i++) {
                in = new FileInputStream(srcfile.get(i));
                out.putNextEntry(new ZipEntry(srcfile.get(i).getName()));
                int len;
                while ((len = in.read(buf)) != -1) {
                    out.write(buf, 0, len);
                }
            }
            out.close();
            bos.close();
            log.info("压缩完成");
        } catch (Exception e) {
            log.error("zip文件打包异常{}",e.getMessage());
            throw new BusinessException("zip文件打包异常");
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}