瀏覽器開啟頁面實現檔案下載的程式碼(php/jsp/java)

來源:互聯網
上載者:User

tomcat中配置如下:

 代碼如下 複製代碼

    <mime-mapping>
        <extension>txt</extension>
        <mime-type>application/octet-stream</mime-type>
    </mime-mapping>
    <mime-mapping>
        <extension>jpg</extension>
        <mime-type>application/octet-stream</mime-type>
    </mime-mapping>

對於如上配置,當訪問副檔名txt或jpg的資源時就出現下載提示框,如果只需要對某些提到的資源讓其出現下載提示框,上述配置就不行了,解決的方法是在資源的response頭中設定content-type即可,例如:

php 中

 代碼如下 複製代碼

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

下載檔案程式

 代碼如下 複製代碼
<?
header("content-type:text/html; charset=utf-8");
$file_name=$_GET['name']; //伺服器的真實檔案名稱
$file_realName=urldecode($_GET['real']); //資料庫的檔案名稱urlencode編碼過的
$file_dir="upload/";
$file = fopen($file_dir . $file_name,"r"); // 開啟檔案
// 輸入檔案標籤
header( "Pragma: public" );
header( "Expires: 0" );
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_dir . $file_name));
Header("Content-Disposition: attachment; filename=" . iconv("UTF-8","GB2312//TRANSLIT",$file_realName));
// 輸出檔案內容
echo fread($file,filesize($file_dir . $file_name));
fclose($file);
exit;
?>


java 中

 代碼如下 複製代碼
response.setContentType("application/octet-stream");
resp.setHeader("Content-Disposition", "attachment;filename="downloaded.txt");

如果需要為下載設定一個儲存的名字,可以用Content-Disposition屬性來指定。

執行個體

 代碼如下 複製代碼

<%@page language="java" contentType="application/x-msdownload" import="java.io.*,java.net.*" pageEncoding="gbk"%><%
  response.reset();//可以加也可以不加
  response.setContentType("application/x-download");//設定為下載application/x-download
  // /../../退WEB-INF/classes兩級到應用的根目錄下去,注意Tomcat與WebLogic下面這一句得到的路徑不同,WebLogic中路徑最後沒有/
  ServletContext context = session.getServletContext();
  String realContextPath = context.getRealPath("")+"\plan\計劃資料範本.xls";
  String filenamedisplay = "計劃資料範本.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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