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();
        }