Java 文件打包下载（打成zip压缩包来下载，url 可直接访问的文件打包下载）

谁借莪１个温暖的怀抱￠ 2022-11-27 09:00 185阅读 0赞

### 一、 java 打ZIP 下载工具类 ###

package com.benefit.car.admin.utils;
    
    import org.springframework.util.ResourceUtils;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.*;
    import java.net.URL;
    import java.util.List;
    import java.util.zip.ZipEntry;
    import java.util.zip.ZipOutputStream;
    
    
    /**
     * 文件操作工具类
     * @author wangsong
     * @mail 1720696548@qq.com
     * @date 2020/8/14 0014 15:14
     * @version 1.0.0
     */
    public class FileUtil {
    
    
        /**
         * 需要 filePaths 下载路径集( 文件 url )
         *      zipNamex  压缩包名 + .zip
         *      res       HttpServletResponse
         **/
        public static void exceDownload(HttpServletResponse res, List<String> filePaths, String zipName) throws IOException { //String zipName = zipName;       // 压缩包名字
            File path = new File(ResourceUtils.getURL("classpath:").getPath());   //项目跟目录
            if (!path.exists()) path = new File("");
            File upload = new File(path.getAbsolutePath(), "static/images/uploaZip");      //压缩包根目录
            if (!upload.exists()) upload.mkdirs();
            String zipFilePath = upload + File.separator + zipName;                              //拼接目录
            //创建zip文件输出流 == 压缩文件========================================================
            File zip = new File(zipFilePath);
            if (!zip.exists()) {
                zip.createNewFile();
            }
            ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zip));
            // 打压缩包
            zipFile(filePaths, zos);
            zos.close();
            //设置下载的压缩文件名称 --> java.net.URLEncoder.encode(zipName, "UTF-8")
            res.setContentType("text/html; charset=UTF-8");        // 设置编码字符
            res.setContentType("application/octet-stream");        // 设置内容类型为下载类型
            OutputStream out = res.getOutputStream();              // 创建页面返回方式为输出流，会自动弹出下载框 new String(zipName.getBytes("utf-8"),"ISO8859-1")
            // res.setHeader("Content-disposition", "attachment;filename=123" + zipName);
            res.addHeader("Content-Disposition", "attachment;filename=" + java.net.URLEncoder.encode(zipName, "UTF-8"));
            //创建zip文件输出流==========================================================
            //将打包后的文件写到客户端，输出的方法同上，使用缓冲流输出
            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(zipFilePath));
            byte[] buff = new byte[bis.available()];
            bis.read(buff);
            bis.close();
            out.write(buff);//输出数据文件
            out.flush();//释放缓存
            out.close();//关闭输出流
        }
    
    
        /**
         * 压缩文件
         *
         * @param filePaths   需要压缩的文件路径集合
         * @throws IOException
         */
        private static String zipFile(List<String> filePaths, ZipOutputStream zos) throws IOException {
            //循环读取文件路径集合，获取每一个文件的路径
            for (String filePath : filePaths) {
                File inputFile = new File(filePath);  //根据文件路径创建文件
                URL url = new URL(filePath);
                BufferedInputStream bis = new BufferedInputStream(url.openStream());
                //将文件写入zip内，即将文件进行打包
                zos.putNextEntry(new ZipEntry(inputFile.getName()));
                //写入文件的方法，同上
                int size = 0;
                byte[] buffer = new byte[1024];  //设置读取数据缓存大小
                while ((size = bis.read(buffer)) > 0) {
                    zos.write(buffer, 0, size);
                }
                //关闭输入输出流
                zos.closeEntry();
                bis.close();
            }
            return null;
        }
    }

### 二、前端下载代码(axios) ###

此代码由前端人员提供

getdownload(url) {
        return http.get(url,  { responseType: 'blob', headers: {Accept: 'application/vnd.openxmlformats-officedocument'}})
          .then(function (res) {
            const blob = new Blob([res.data], {type: 'application/zip'});
            const filename = res.headers['content-disposition'];
            const downloadElement = document.createElement('a');
            const href = window.URL.createObjectURL(blob); //创建下载的链接
            downloadElement.href = href;
            [downloadElement.download] = [decodeURI(filename.split('=')[1])];
            document.body.appendChild(downloadElement);
            downloadElement.click(); //点击下载
            document.body.removeChild(downloadElement); //下载完成移除元素
            window.URL.revokeObjectURL(href); //释放blob对象
          })
          .catch(function (error) {
            console.log(error);
          });
      }

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