将 pdf 文件作为 bytearray 发送作为响应时在 scala 中遇到错误 "Failed to load PDF document." (scala)

Question

我写了下面的代码来发送 pdf 文件作为响应，但我卡在了某一点它会报错 "Failed to load PDF document."

代码是：

def downloadResumeFile(downloadFilePath: String, response: HttpServletResponse): ResponseEntity[String] = {

    val filename = "somefile.pdf"
    val file = new File(filename)
    println(file.exists())
    val fis = new FileInputStream(file)
    var data = new Array[Byte](file.length.asInstanceOf[Int])
    fis.read(data)
    val bos = new ByteArrayOutputStream()
    data = bos.toByteArray

    response.setContentType("application/pdf; charset=UTF-8")
    response.setHeader("Content-Disposition", s"attachment;filename="+downloadFilePath)
    response.setCharacterEncoding("UTF-8")
    val servletOutputStream = new PrintWriter(response.getOutputStream)
    servletOutputStream.println(data)

    fis.close()
    bos.flush()
    bos.close()
    servletOutputStream.flush()
    servletOutputStream.close()

    ResponseEntity.ok("File downloaded")

  }

谁能帮我解决这个问题？

Answer 1

A PrintWriter 写文本很有用，但 PDF 是二进制数据。

val out = response.getOutputStream
java.nio.file.Files.copy(file.toPath, out)
out.flush()

将 pdf 文件作为 bytearray 发送作为响应时在 scala 中遇到错误 "Failed to load PDF document." (scala)

Facing Error "Failed to load PDF document." in scala when send pdf file as bytearray in response (scala)

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