Java下载Servlet Demo

 1 request.setCharacterEncoding("utf-8");
 2         String name=request.getParameter("name");
 3         //1、设置响应头
 4         response.setContentType("application/force-download");
 5         //2、读取文件
 6         String path=getServletContext().getRealPath("/file/"+name);
 7         InputStream in=new FileInputStream(path);
 8         //3、对文件名进行编码
 9         name=URLEncoder.encode(name, "utf-8");
10         //4、设置响应头
11         response.setHeader("Content-Disposition","attachment;filename="+name);//如果不写attachment，则会在浏览器中打开
12         response.setContentLength(in.available());
13         //5、开始copy文件
14         OutputStream out=response.getOutputStream();
15         byte[] b=new byte[1024];
16         int len=-1;
17         while((len=in.read(b))!=-1)
18         {
19             out.write(b, 0, len);
20         }
21         out.close();
22         in.close();
23         
24         
25     }