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浏览器打开页面实现文件下载的程序代码(php/jsp/java)

WBOY
WBOYOriginal
2016-06-13 10:01:281431browse

浏览器打开页面实现文件下载的程序代码(php/jsp/java) 有需要学习的同学可参考一下。

tomcat中配置如下:

 代码如下 复制代码

   
        txt
        application/octet-stream
   

   
        jpg
        application/octet-stream
   

对于如上配置,当访问扩展名txt或jpg的资源时就出现下载提示框,如果只需要对某些提到的资源让其出现下载提示框,上述配置就不行了,解决的方法是在资源的response头中设置content-type即可,例如:

php 中

 代码如下 复制代码

header("Content-type:application/octet-stream");
header('Content-Disposition: attachment; filename="downloaded.txt"');

下载文件程序

 代码如下 复制代码

header("content-type:text/html; charset=utf-8");
$file_name=$_GET['name']; //服务器的真实文件名
$file_realName=urldecode($_GET['real']); //数据库的文件名urlencode编码过的
$file_dir="upload/";
$file = fopen($file_dir . $file_name,"r"); // 打开文件
// 输入文件标签
header( "Pragma: public" );
header( "Expires: 0" );
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_dir . $file_name));
Header("Content-Disposition: attachment; filename=" . iconv("UTF-8","GB2312//TRANSLIT",$file_realName));
// 输出文件内容
echo fread($file,filesize($file_dir . $file_name));
fclose($file);
exit;
?>


java 中

 代码如下 复制代码
response.setContentType("application/octet-stream");
resp.setHeader("Content-Disposition", "attachment;filename="downloaded.txt");

如果需要为下载设置一个保存的名字,可以用Content-Disposition属性来指定。

实例

 代码如下 复制代码

  response.reset();//可以加也可以不加
  response.setContentType("application/x-download");//设置为下载application/x-download
  // /../../退WEB-INF/classes两级到应用的根目录下去,注意Tomcat与WebLogic下面这一句得到的路径不同,WebLogic中路径最后没有/
  ServletContext context = session.getServletContext();
  String realContextPath = context.getRealPath("")+"\plan\计划数据模板.xls";
  String filenamedisplay = "计划数据模板.xls";
  filenamedisplay = URLEncoder.encode(filenamedisplay,"UTF-8");
  response.addHeader("Content-Disposition","attachment;filename=" + filenamedisplay);
  OutputStream output = null;
  FileInputStream fis = null;
  try
  {
  output  = response.getOutputStream();
  fis = new FileInputStream(realContextPath);
  byte[] b = new byte[1024];
  int i = 0;
  while((i = fis.read(b)) > 0)
  {
  output.write(b, 0, i);
  }
  output.flush();
  }
  catch(Exception e)
  {
  System.out.println("Error!");
  e.printStackTrace();
  }
  finally
  {
  if(fis != null)
  {
  fis.close();
  fis = null;
  }
  if(output != null)
  {
  output.close();
  output = null;
  }
  }
  %>

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