Java携带HTTP头信息下载网络图片

版权声明：转载请注名出处 https://blog.csdn.net/meism5/article/details/88415594

网络图片下载校验一般分两种情况：
1、校验Reffer头信息，即只有指定的网站的才能访问图片
2、校验Cookie头信息，即只有登录状态才能访问图片
如下图直接通过url访问返回：{"code":"40310014","msg":"invalid Referer header"}

原http访问图片携带了Reffer

 

工具代码 

/**
	 * 携带头信息下载网络图片
	 * @param url 图片url
	 * @param formatName 文件格式名称
	 * @param localFile 下载到本地文件
	 * @param headers http协议交互中header信息，如Cookie
	 * @return 下载是否成功
	 */
	public static boolean downloadImageWithHeaders(String imageUrl, String formatName, File localFile, Map<String, String> headers) {
		boolean isSuccess = false;
		InputStream stream = null;
		try {
			URL url = new URL(imageUrl);
			URLConnection conn = url.openConnection();
			if (headers != null && !headers.isEmpty()) {
				//设置头信息
				for (Map.Entry<String, String> entry : headers.entrySet()) {
					conn.setRequestProperty(entry.getKey(), entry.getValue());
				}
			}
			conn.setDoInput(true);
			stream = conn.getInputStream();
			BufferedImage bufferedImg = ImageIO.read(stream);
			if (bufferedImg != null) {
				isSuccess = ImageIO.write(bufferedImg, formatName, localFile);
			} else {
				throw new RuntimeException("图片[" + imageUrl + "]下载失败");
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (stream != null) {
				try {
					stream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return isSuccess;
	}

测试代码

/**
	 * 测试携带请求头
	 */
	@Test
	public void testDownloadImageWithHeaders() {
		String baiduLogoUrl = "http://pic.58pic.com/58pic/15/68/59/71X58PICNjx_1024.jpg";
		File localFile = new File(IMAGE_PATH + "scenery.jpg");
		Map<String, String> headers = new HashMap<String, String>();
//		headers.put("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8");
//		headers.put("Accept-Encoding", "gzip, deflate");
//		headers.put("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8");
//		headers.put("Cache-Control", "max-age=0");
//		headers.put("Connection", "keep-alive");
//		headers.put("Cookie", "referer=%22https%3A%5C%2F%5C%2Fwww.58pic.com%5C%2Ftupian%5C%2FBMP.html%22; qt_visitor_id=%228d800369135f0ea407efc30c35b855c0%22; qt_uid=0; qt_type=0; user-browser=%22baidu%22; history_search=%22%7B%5C%22BMP_%5C%22%3A%5C%22%5C%5C%5C%2Ftupian%5C%5C%5C%2FBMP.html%5C%22%7D%22; awake=0; qiantudata2018jssdkcross=%7B%22distinct_id%22%3A%2216956b4d4b859f-0f2dc330b57f7c-3a3a5c0e-2073600-16956b4d4b92bd%22%2C%22props%22%3A%7B%22latest_traffic_source_type%22%3A%22%E8%87%AA%E7%84%B6%E6%90%9C%E7%B4%A2%E6%B5%81%E9%87%8F%22%2C%22latest_referrer%22%3A%22https%3A%2F%2Fwww.baidu.com%2Flink%22%2C%22latest_referrer_host%22%3A%22www.baidu.com%22%2C%22latest_search_keyword%22%3A%22%E6%9C%AA%E5%8F%96%E5%88%B0%E5%80%BC%22%7D%7D; qt_utime=1551937913; FIRSTVISITED=1551937885.528; showAd:8d800369135f0ea407efc30c35b855c0=%22w6SIEgLKiJOIC5HVD3fKoJHKodaWmZy8mtm4zJbLytqWn5vMyZmWyZm4yJG4nwmWiIWIywr5zxj3AxnLCL2Pzci9iJeIlcj3DxjUiJOImsiSiNnOB6DFDgLTzxmIoJmSiMXHC6rFC5HVD423Aw4LiJOXntuXotm6ote3Fv3%3D%22");
//		headers.put("Host", "pic.58pic.com");
//		headers.put("If-Modified-Since", "Tue, 22 Jul 2014 15:40:16 GMT");
//		headers.put("If-None-Match", "ae01753237194fa9a5badf2d90fd20d6");
		headers.put("Referer", "http://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E5%9B%BE%E7%89%87&step_word=&hs=0&pn=0&spn=0&di=107250&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=1986179278%2C1118313821&os=1011800134%2C3605107432&simid=3440756675%2C361207036&adpicid=0&lpn=0&ln=1765&fr=&fmq=1552355383195_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=http%3A%2F%2Fpic.58pic.com%2F58pic%2F15%2F68%2F59%2F71X58PICNjx_1024.jpg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fooo_z%26e3Bcbrtv_z%26e3Bv54AzdH3Ffitstwg2p7AzdH3F8cmbcl08_z%26e3Bip4s&gsm=0&rpstart=0&rpnum=0&islist=&querylist=&force=undefined");
//		headers.put("Upgrade-Insecure-Requests", "1");
//		headers.put("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36");
		Assert.assertTrue(ImageUtil.downloadImageWithHeaders(baiduLogoUrl, ImageUtil.JPG, localFile, headers));
	}

完整源码：https://github.com/ConstXiong/xtools