Program code for downloading files by opening the page in the browser (php/jsp/java)

Program code for downloading files by opening the page in the browser (php/jsp/java)_PHP tutorial

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Release： 2016-07-13 16:56:20

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The program code (php/jsp/java) for downloading files by opening the page in the browser. Students who need to learn can refer to it.

The configuration in tomcat is as follows:

The code is as follows

Copy code

代码如下	复制代码
txt application/octet-stream jpg application/octet-stream

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

For the above configuration, when accessing resources with extension txt or jpg, a download prompt box will appear. If you only need to have a download prompt box appear for some mentioned resources, the above configuration will not work. The solution is Just set the content-type in the response header of the resource, for example:

php in

代码如下

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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;
?>

The code is as follows	Copy code
header("Content-type:application/octet-stream"); header('Content-Disposition: attachment; filename="downloaded.txt"');

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

Download file program in java

The code is as follows	Copy code
response.setContentType("application/octet-stream "); resp.setHeader("Content-Disposition", "attachment;filename="downloaded.txt");

If you need to set a saved name for the download, you can use the Content-Disposition attribute to specify it.

Example

The code is as follows

代码如下

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<%@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");//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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<%@page language="java" contentType="application/x-msdownload" import="java.io.*,java.net.*" pageEncoding="gbk"%><%
response.reset();//You can add it or not add it
response.setContentType("application/x-download");//Set to download application/x-download
// /../../ Go back two levels to WEB-INF/classes and go to the root directory of the application. Note that the paths obtained in the following sentence are different between Tomcat and WebLogic. There is no / at the end of the path in WebLogic.
ServletContext context = session.getServletContext();
String realContextPath = context.getRealPath("")+"plan plan data template.xls";
String filenamedisplay = "Plan data template.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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