Question

我试图将zip文件作为输出供用户下载。我创建了一个zipOutputStream ..并尝试将其发送到vertx http响应

这怎么下载一个损坏的zip文件。或挂起

 public void download(RoutingContext routingContext) {
    try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
         ZipOutputStream zos = new ZipOutputStream(baos)) {

      for (int i = 0; i < 2; i++) {
        String fileName = "test" + i + ".csv";
        File tempFile = createTempFile("test" + i);
        tempFile.deleteOnExit();

        InputStream is = new FileInputStream(tempFile);
        byte[] buffer = new byte[is.available()];
        is.read(buffer);

        ZipEntry entry = new ZipEntry(fileName);
        zos.putNextEntry(entry);

        try {
          zos.write(buffer, 0, buffer.length);
          zos.closeEntry();

          String b64String = Base64.encodeBase64String(baos.toByteArray());

          routingContext.response()
            .setChunked(true)
            .putHeader(HttpHeaders.CONTENT_TYPE, "application/zip")
            .putHeader("Content-Disposition", "attachment; filename=\"test.zip\"")
            .putHeader(HttpHeaders.TRANSFER_ENCODING, "chunked")
            .putHeader(HttpHeaders.CONTENT_LENGTH, Long.toString(b64String.length()));

          routingContext.response().write(b64String);
          routingContext.response().end();
          routingContext.response().close();

        } finally {
          baos.close();
        }
      }

    }
    catch(Exception ex) {

    }

  }

Answer 1

我制定了解决方案。我将vertx httpResponse包装在outputStream中，并将其推送到zipOutputStream中。它通过将chunked设置为true来实现。

Answer 2

对于非常大的文件，可以使用流传输来避免将它们完全加载到RAM中：

Tesseract git repository located in  C:\opencv\tesseract
Tesseract build directory  C:\opencv\tesseract\build
Leptonica repository located in  C:\opencv\leptonica

Leptonica build directory in  C:\opencv\leptonica\build (contains LeptonicaConfig.cmake, 
Leptonica library files, (libleptonica.so, libleptonica.so.1.77.0, libleptonica.so.5.3.0) are in C:\opencv\leptonica\build\src

不幸的是，AsyncInputStream（用于InputStream到ReadStream的包装）尚未成为VertX框架的一部分，因此您必须自己实现它或找到一些开源实现。

Vertx Streaming zip文件到http响应

2 个答案: