img标签通过别人的接口,获得文件流展示图片

HTML 标签

<img class="weui-uploader__file"  style="background-image: url('+ window.location.protocol + "//" + window.location.host +"/utils/fileStream?imgUrl=" + encodeURIComponent(imgList[j]) +')" ></img>

JAVA Controller

	/**
     * 根据图片地址获取图片文件流
     * 
     * @param request
     * @param response
     * @param imgUrl
     */
    @RequestMapping(value = "/fileStream")
    @ResponseBody
    public void fileStream(HttpServletRequest request, HttpServletResponse response, String imgUrl) {
        try {
            InputStream is = getInputStream(kehuApiConfig.getKehuApiUrlByImage() + URLEncoder.encode(imgUrl, "utf-8"));
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            OutputStream os = response.getOutputStream();
            int ch = 0;
            while (-1 != (ch = is.read())) {
                baos.write(ch);
            }
            os.write(baos.toByteArray());
            is.close();
            baos.close();
            os.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 请求别人的图片url地址,获得文件流
     * 
     * @param imgUrl
     * @return
     */
    public static InputStream getInputStream(String imgUrl) {
        InputStream inputStream = null;
        HttpURLConnection httpURLConnection = null;
        try {
            URL url = new URL(imgUrl);
            httpURLConnection = (HttpURLConnection)url.openConnection();
            // 设置网络连接超时时间
            httpURLConnection.setConnectTimeout(3000);
            // 设置应用程序要从网络连接读取数据
            httpURLConnection.setDoInput(true);

            httpURLConnection.setRequestMethod("GET");
            int responseCode = httpURLConnection.getResponseCode();
            if (responseCode == 200) {
                // 从服务器返回一个输入流
                inputStream = httpURLConnection.getInputStream();
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return inputStream;
    }

参考两个帖子
1:https://blog.csdn.net/neu_yousei/article/details/22413855
2:https://www.cnblogs.com/lazyli/p/11739245.html