压缩包工具类（下载）

import com.enlistboot.common.core.FileResult;
import org.springframework.http.HttpHeaders;
import org.springframework.util.ObjectUtils;import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;public class ZipUtil {/*** 压缩包下载** @param response* @param fileName* @param list*/public static void downloadZip(HttpServletResponse response, String fileName, List<FileResult> list) {try {BufferedInputStream bis = null;java.io.File file = null;ByteArrayOutputStream output = new ByteArrayOutputStream();//ByteArray临时存储流ZipOutputStream zipOut = new ZipOutputStream(response.getOutputStream());InputStream fis = null;response.setCharacterEncoding("UTF-8");response.setContentType("application/octet-stream;charset=UTF-8");response.setHeader(Content-Disposition, "attachment;filename=\"" + URLEncoder.encode(fileName + ".zip", "UTF-8") + "\"");Map<String, String> map = new HashMap<>();for (FileResult studentInfoVo : list) {
//                FileInputStream fis = new FileInputStream(new File(studentInfoVo.getKszp()));if (ObjectUtils.isEmpty(map.get(studentInfoVo.getFolderName()))) {String path = studentInfoVo.getUrl();
//                    String path = "https://img1.baidu.com/it/u=3539595421,754041626&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500";URL url = new URL(path);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setConnectTimeout(5000);connection.setReadTimeout(5000);fis = connection.getInputStream();// 向zip输出流添加该文件的zip实体if (ObjectUtils.isEmpty(map.get(studentInfoVo.getFolderName()))) {zipOut.putNextEntry(new ZipEntry(fileName + "/" + studentInfoVo.getFolderName()));}// 使用缓冲流提高效率bis = new BufferedInputStream(fis);// 缓冲字节数组byte[] buffer = new byte[1024];int len = -1;// 将文件数据写入zip输出流while ((len = bis.read(buffer)) != -1) {output.reset();output.write(buffer, 0, len);// 使用OutputStream将缓冲区的数据输出到客户端浏览器zipOut.write(output.toByteArray());}map.put(studentInfoVo.getFolderName(),studentInfoVo.getFolderName());zipOut.flush();zipOut.closeEntry();bis.close();output.close();}}fis.close();zipOut.close();} catch (Exception e) {e.printStackTrace();}}
}