zip下载.md · 爆米花/代码片段笔记

### zip下载

```java
/**
     * 下载 zip
     *
     * @param no 单号
     * @return {@link ResponseEntity<Resource>}
     */
    @GetMapping("qr/downloadQrZip/{no}")
    public ResponseEntity<Resource> downloadQrZip(@PathVariable("no") String no) {
        try {
            // 定义压缩包名字
            String fileName = no + "--" + ".zip";
            HttpHeaders httpHeaders = new HttpHeaders();
            httpHeaders.setContentDisposition(ContentDisposition.builder("attachment").filename(fileName, StandardCharsets.UTF_8).build());

ByteArrayOutputStream finallyOut = new ByteArrayOutputStream();
            ByteArrayOutputStream tempOut = new ByteArrayOutputStream();
            ByteArrayInputStream tempIn;
            // finallyOut 封装 压缩输出流 zipOut
            ZipOutputStream zipOut = new ZipOutputStream(finallyOut);
            // 业务操作
            for (SaleProduct saleProduct : listOfBusiness) {
                ZipEntry z = new ZipEntry(businessName + ".jpg");
                zipOut.putNextEntry(z);
                // 业务操作结果 写入 tempOut
                BufferedImage drawImg = MatrixToImageWriter.drawImg(content);
                ImageIO.write(drawImg, "jpg", tempOut);
                // tempOut 转化 tempIn
                tempIn = new ByteArrayInputStream(tempOut.toByteArray());
                // tempIn 写入 zipOut
                int bytesRead;
                byte[] buffer = new byte[1024];
                while ((bytesRead = tempIn.read(buffer, 0, 1024)) != -1) {
                    zipOut.write(buffer, 0, bytesRead);
                }
                tempIn.reset();
                tempOut.reset();
            }
            zipOut.flush();
            zipOut.close();
            ByteArrayResource source = new ByteArrayResource(finallyOut.toByteArray());
            return ResponseEntity.ok().headers(httpHeaders).body(source);
        } catch (Exception e) {
            return ResponseEntity.badRequest().build();
        }
```

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