Java下载Servlet Demo

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

     }

写在Servlet中，可以防止盗链，进行过滤等操作