根据URL下载图片至客户端、服务器实例

1、保存至服务器

　　根据路径保存至项目所在服务器上。

         String imgUrl="";//图片地址
         try {
             // 构造URL
             URL url = new URL(imgUrl);
             // 打开连接
             URLConnection con = url.openConnection();
             // 输入流
             InputStream is = con.getInputStream();
             // 1K的数据缓冲
             byte[] bs = new byte[1024];
             // 读取到的数据长度
             int len;
             // 输出的文件流
             OutputStream os = new FileOutputStream("c:\\image.jpg");//保存路径
             // 开始读取
             while ((len = is.read(bs)) != -1) {
                 os.write(bs, 0, len);
             }
             // 完毕，关闭所有链接
             os.close();
             is.close();
         } catch (MalformedURLException e) {
             e.printStackTrace();
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

2、保存至本地

　　以浏览器下载的方式保存至本地。

         String imgUrl="";//URL地址
         String fileName = imgUrl.substring(imgUrl.lastIndexOf('/') + 1);
         BufferedInputStream is = null;
         BufferedOutputStream os = null;
         try {
             URL url = new URL(imgUrl);
             this.getServletResponse().setContentType("application/x-msdownload;");
             this.getServletResponse().setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("utf-8"), "ISO8859-1"));
             this.getServletResponse().setHeader("Content-Length", String.valueOf(url.openConnection().getContentLength()));
             is = new BufferedInputStream(url.openStream());
             os = new BufferedOutputStream(this.getServletResponse().getOutputStream());
             byte[] buff = new byte[2048];
             int bytesRead;
             while (-1 != (bytesRead = is.read(buff, 0, buff.length))) {
                 os.write(buff, 0, bytesRead);
             }
             if (is != null)
                 is.close();
             if (os != null)
                 os.close();
         } catch (MalformedURLException e) {
             e.printStackTrace();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }