使用PHP将二进制流写入浏览器

Question

背景

尝试将使用iReport通过PHP编写的PDF报告流式传输到浏览器.一般的问题是:如何使用PHP将二进制数据写入浏览器？

工作守则

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 );

非工作准则

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;

题

我怎样才能找到写入文件的中间步骤并直接写入浏览器以便PDF不会损坏？

更新

PDF文件大小:

• 工作:594778字节
• 不工作:1059365字节

谢谢!

Answer 1

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

  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;