java 将多张图片文件压缩zip下载

1、controller　　前端把图片文件的id用逗号隔开拼起来传给后端。

    /**
     * 下载选中资源
     *
     * @param response
     * @return: void
     */
    @GetMapping("downloadDataZip")
    public void downloadDataZip(String signs, HttpServletResponse response) {
        String[] strSigns = signs.split(",");
        List<Long> ids = new ArrayList<>();
        for(String sign : strSigns){
            Long tmpId = Security.decodeSignQuiet(sign);
            ids.add(tmpId);
        }

        List<StoreImgModel> modelList = storeImgService.listByIds(ids);
        Map<String, String> srcFiles = new HashMap<>();
        for(StoreImgModel imgModel : modelList){
            srcFiles.put(imgModel.getName(), imgModel.getImgUrl());
        }

        String title ="下载选中图片.zip";
        File filePath = new File(FileUtil.getTemplatePath() + File.separator + title);
        FileUtil.zipFiles(srcFiles, filePath);
        String filename = System.currentTimeMillis()+"_"+title;
        //设置文件路径
        if (filePath.exists()) {
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            try {
                response.setContentType("application/octet-stream");
                response.setHeader("Content-disposition", "attachment; filename=" + new String(filename.getBytes("utf-8"), "ISO8859-1"));
                byte[] buffer = new byte[4096];
                fis = new FileInputStream(filePath);
                bis = new BufferedInputStream(fis);
                OutputStream os = response.getOutputStream();
                int i = bis.read(buffer);
                while (i != -1) {
                    os.write(buffer, 0, i);
                    i = bis.read(buffer);
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                        // 删除临时文件
                        filePath.delete();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

　　2、创建一个文件处理工具类  FileUtil.java 

package common.util;


import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class FileUtil {

    /**
     * 多图片压缩zip
     *
     * @param srcFiles 图片名称
     * @param zipFile  文件路径
     */
    public static void zipFiles(Map<String, String> srcFiles, File zipFile) {

        // 判断压缩后的文件存在不，不存在则创建
        if (!zipFile.exists()) {
            try {
                zipFile.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        // 创建 FileOutputStream 对象
        FileOutputStream fileOutputStream ;
        // 创建 ZipOutputStream
        ZipOutputStream zipOutputStream ;
        // 创建 FileInputStream 对象
        BufferedInputStream bis = null;

        InputStream inputStream = null;

        try {
            // 实例化 FileOutputStream 对象
            fileOutputStream = new FileOutputStream(zipFile);
            // 实例化 ZipOutputStream 对象
            zipOutputStream = new ZipOutputStream(fileOutputStream);
            // 创建 ZipEntry 对象
            ZipEntry zipEntry ;
            // 遍历源文件数组
            for (String file : srcFiles.keySet()) {
                // 将源文件数组中的当前文件读入 FileInputStream 流中
                String fileName = file;
                URL url = new URL(srcFiles.get(file));
                inputStream = url.openStream();
                // 文件后缀名称
                // 实例化 ZipEntry 对象，源文件数组中的当前文件
                zipEntry = new ZipEntry(fileName);
                zipOutputStream.putNextEntry(zipEntry);
                // 该变量记录每次真正读的字节个数
                int len;
                // 定义每次读取的字节数组
                byte[] buffer = new byte[4096];
                while ((len = inputStream.read(buffer)) > 0) {
                    zipOutputStream.write(buffer, 0, len);
                }

            }
            zipOutputStream.closeEntry();
            zipOutputStream.close();

            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (bis != null) {
                    bis.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 获取类路径
     * return 绝对路径地址
     */
    public static String getTemplatePath() {
        String realPath = FileUtil.class.getClassLoader().getResource("").getFile();
        File file = new File(realPath);
        realPath = file.getAbsolutePath();
        try {
            realPath = java.net.URLDecoder.decode(realPath, "utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return realPath;
    }

}

　　3、前端请求，直接用window.location.href

batchDownload: function (){
                let data = table.checkStatus('ImgTableId').data;
                let signs = "";
                data.forEach((item, index)=>{
                    signs += item.sign + ",";
                });
                if (signs && signs.endsWith(",")){
                    signs = signs.substr(0, signs.length -1);
                }
                window.location.href = "${serverBaseUrl}/downloadDataZip?signs="+signs;
            }

　　

参考：https://blog.csdn.net/zouliping123456/article/details/115211866