jsp实现文件下载的代码（转载）

Java代码  

1. OutputStream out=response.getOutputStream();
2. byte by[]=new byte[500];
3. File fileLoad=new File(path);
4. response.reset();
5. response.setContentType("application/vnd.ms-excel");
6. response.setHeader("content-disposition","attachment; filename=text.xls");
7. long fileLength=fileLoad.length();
8. String length1=String.valueOf(fileLength);
9. response.setHeader("Content_Length",length1);
10. FileInputStream in=new FileInputStream(fileLoad);
11. int n;
12. while((n=in.read(by))!=-1){
13. out.write(by,0,n);
14. }
15. in.close();
16. out.flush();

以上代码以下载excel为例，各种文件的下载大体相同只需改变相应的contentType即可。
其中response.setContentType()的String参数及对应类型为

Java代码 BMP

GIF JPEG TIFF DCX PCX HTML TXT XML AFP PDF RTF MSWORD MSEXCEL MSPOWERPOINT WORDPERFECT WORDPRO VISIO FRAMEMAKER LOTUS123" quality="high" allowscriptaccess="always" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"> 

1. <option   value="image/bmp">BMP</option>
2. <option   value="image/gif">GIF</option>
3. <option   value="image/jpeg">JPEG</option>
4. <option   value="image/tiff">TIFF</option>
5. <option   value="image/x-dcx">DCX</option>
6. <option   value="image/x-pcx">PCX</option>
7. <option   value="text/html">HTML</option>
8. <option   value="text/plain">TXT</option>
9. <option   value="text/xml">XML</option>
10. <option   value="application/afp">AFP</option>
11. <option   value="application/pdf">PDF</option>
12. <option   value="application/rtf">RTF</option>
13. <option   value="application/msword">MSWORD</option>
14. <option   value="application/vnd.ms-excel">MSEXCEL</option>
15. <option   value="application/vnd.ms-powerpoint">MSPOWERPOINT</option>
16. <option   value="application/wordperfect5.1">WORDPERFECT</option>
17. <option   value="application/vnd.lotus-wordpro">WORDPRO</option>
18. <option   value="application/vnd.visio">VISIO</option>
19. <option   value="application/vnd.framemaker">FRAMEMAKER</option>
20. <option   value="application/vnd.lotus-1-2-3">LOTUS123</option>