问题描述
我有以下代码：
public BufferedImage urlToImage(String imageUrl) throws MalformedURLException, IOException {
URL url = new URL(imageUrl);
BufferedImage image = ImageIO.read(url);
return image;
}
应该返回给定网址的图片。
That is supposed to return an image from a given URL.
我使用这两个随机选择的网址进行了测试：
I tested with these two randomly chosen URLs:
- https://www.google.co.ma/images/srpr/logo4w.png
- http://www.earthtimes.org/newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg
第一个工作正常，但第二个产生403错误：
The first one works fine, but the second gives a 403 error:
Caused by: java.io.IOException: Server returned HTTP response code: 403 for URL: http://www.earthtimes.org/newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1436)
at java.net.URL.openStream(URL.java:1010)
at javax.imageio.ImageIO.read(ImageIO.java:1367)
可能是错误的原因是什么？谢谢。
What could be the cause of the error ? Thanks.
推荐答案
ImageIO.read（URL）方法打开一个几乎所有默认设置的URL连接，包括 User-Agent 属性（将设置为您运行的JVM版本）。显然，您列出的网站需要更标准的UA。使用直接telnet连接进行测试：
The ImageIO.read(URL) method opens a URL connection with pretty much all default settings, including the User-Agent property (which will be set to the JVM version you are running on). Apparently, the site you listed expects a more 'standard' UA. Testing with a straight telnet connection:
请求发送 ImageIO.read（url）：
响应代码为404（对我来说至少），返回默认 text / html 页面。
请求已发送通过'标准'浏览器：
Request sent by 'standard' browser:
响应代码为200，使用图像数据。
以下简单修复程序可以延长代码，但通过设置更标准的UA来解决问题：
The following simple fix lengthens your code, but gets around the problem, by setting a more 'standard' UA:
final String urlStr = "http://www.earthtimes.org/newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg";
final URL url = new URL(urlStr);
final HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setRequestProperty(
"User-Agent",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.65 Safari/537.31");
final BufferedImage image = ImageIO.read(connection.getInputStream());
这篇关于ImageIO.read（）返回403错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！