使用 PHP 将二进制流写入浏览器

发布于 2024-09-01 07:12:20 字数 1393 浏览 6 评论 0原文

背景

尝试通过 PHP 将使用 iReport 编写的 PDF 报告传输到浏览器。一般问题是：如何使用 PHP 将二进制数据写入浏览器？

工作代码

header('Cache-Control: no-cache private');
header('Content-Description: File Transfer');
header('Content-Disposition: attachment, filename=climate-report.pdf');
header('Content-Type: application/pdf');
header('Content-Transfer-Encoding: binary');

$path = realpath( "." ) . "/output.pdf";

$em = java('net.sf.jasperreports.engine.JasperExportManager');
$result = $em->exportReportToPdf($pm);
header('Content-Length: ' . strlen( $result ) );

$fh = fopen( $path, 'w' );
fwrite( $fh, $result );
fclose( $fh );

readfile( $path );

非工作代码

header('Cache-Control: no-cache private');
header('Content-Description: File Transfer');
header('Content-Disposition: attachment, filename=climate-report.pdf');
header('Content-Type: application/pdf');
header('Content-Transfer-Encoding: binary');

$path = realpath( "." ) . "/output.pdf";

$em = java('net.sf.jasperreports.engine.JasperExportManager');
$result = $em->exportReportToPdf($pm);
header('Content-Length: ' . strlen( $result ) );

echo $result;

问题

如何去掉写入文件的中间步骤，直接写入浏览器，以便PDF没有损坏？

更新

PDF 文件大小：

工作：594778 字节
非工作：1059365 字节

谢谢！

原文

Background

Trying to stream a PDF report written using iReport through PHP to the browser. The general problem is: how do you write binary data to the browser using PHP?

Working Code

header('Cache-Control: no-cache private');
header('Content-Description: File Transfer');
header('Content-Disposition: attachment, filename=climate-report.pdf');
header('Content-Type: application/pdf');
header('Content-Transfer-Encoding: binary');

$path = realpath( "." ) . "/output.pdf";

$em = java('net.sf.jasperreports.engine.JasperExportManager');
$result = $em->exportReportToPdf($pm);
header('Content-Length: ' . strlen( $result ) );

$fh = fopen( $path, 'w' );
fwrite( $fh, $result );
fclose( $fh );

readfile( $path );

Non-working Code

header('Cache-Control: no-cache private');
header('Content-Description: File Transfer');
header('Content-Disposition: attachment, filename=climate-report.pdf');
header('Content-Type: application/pdf');
header('Content-Transfer-Encoding: binary');

$path = realpath( "." ) . "/output.pdf";

$em = java('net.sf.jasperreports.engine.JasperExportManager');
$result = $em->exportReportToPdf($pm);
header('Content-Length: ' . strlen( $result ) );

echo $result;

Question

How can I take out the middle step of writing to the file and write directly to the browser so that the PDF is not corrupted?

Update

PDF file sizes:

Working: 594778 bytes
Non-working: 1059365 bytes

Thank you!

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失而复得 2024-09-08 07:12:20

我以前在使用 Java 进行编写时遇到过问题，因为它使用 UTF-16。来自 http://zeronine.org/lab/index.php 的函数 outputPDF 使用java_set_file_encoding("ISO-8859-1");。因此：

  java_set_file_encoding("ISO-8859-1");

  $em = java('net.sf.jasperreports.engine.JasperExportManager');
  $result = $em->exportReportToPdf($pm);

  header('Content-Length: ' . strlen( $result ) );

  echo $result;

I've previously experienced problems writing from Java because it'll use UTF-16. The function outputPDF from http://zeronine.org/lab/index.php uses java_set_file_encoding("ISO-8859-1");. Thus:

  java_set_file_encoding("ISO-8859-1");

  $em = java('net.sf.jasperreports.engine.JasperExportManager');
  $result = $em->exportReportToPdf($pm);

  header('Content-Length: ' . strlen( $result ) );

  echo $result;

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