java文件下载到本地 java 下载文件

public HttpServletResponse download(String path, HttpServletResponse response) { 

        try { 

            // path是指欲下载的文件的路径。 

            File file = new File(path); 

            // 取得文件名。 

            String filename = file.getName(); 

            // 取得文件的后缀名。 

            String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase(); 

  

            // 以流的形式下载文件。 

            InputStream fis = new BufferedInputStream(new FileInputStream(path)); 

            byte[] buffer = new byte[fis.available()]; 

            fis.read(buffer); 

            fis.close(); 

            // 清空response 

            response.reset(); 

            // 设置response的Header 

            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes())); 

            response.addHeader("Content-Length", "" + file.length()); 

            OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); 

            response.setContentType("application/octet-stream"); 

            toClient.write(buffer); 

            toClient.flush(); 

            toClient.close(); 

        } catch (IOException ex) { 

            ex.printStackTrace(); 

        } 

        return response; 

    } 

  

    public void downloadLocal(HttpServletResponse response) throws FileNotFoundException { 

        // 下载本地文件 

        String fileName = "Operator.doc".toString(); // 文件的默认保存名 

        // 读到流中 

        InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路径 

        // 设置输出的格式 

        response.reset(); 

        response.setContentType("bin"); 

        response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); 

        // 循环取出流中的数据 

        byte[] b = new byte[100]; 

        int len; 

        try { 

            while ((len = inStream.read(b)) > 0) 

                response.getOutputStream().write(b, 0, len); 

            inStream.close(); 

        } catch (IOException e) { 

            e.printStackTrace(); 

        } 

    } 

  

    public void downloadNet(HttpServletResponse response) throws MalformedURLException { 

        // 下载网络文件 

        int bytesum = 0; 

        int byteread = 0; 

  

        URL url = new URL("windine.blogdriver.com/logo.gif"); 

  

        try { 

            URLConnection conn = url.openConnection(); 

            InputStream inStream = conn.getInputStream(); 

            FileOutputStream fs = new FileOutputStream("c:/abc.gif"); 

  

            byte[] buffer = new byte[1204]; 

            int length; 

            while ((byteread = inStream.read(buffer)) != -1) { 

                bytesum += byteread; 

                System.out.println(bytesum); 

                fs.write(buffer, 0, byteread); 

            } 

        } catch (FileNotFoundException e) { 

            e.printStackTrace(); 

        } catch (IOException e) { 

            e.printStackTrace(); 

        } 
    }