ImageIO.read（）返回403错误 [英] ImageIO.read() returns 403 error

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

• 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）：

GET /newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg HTTP / 1.1

User-Agent： Java / 1.7.0_17

主持人：www.earthtimes.org

接受：text / html，image / gif，image / jpeg，*; q = .2， / ; q = .2

连接：keep-alive

GET /newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg HTTP/1.1
User-Agent: Java/1.7.0_17
Host: www.earthtimes.org
Accept: text/html, image/gif, image/jpeg, *; q=.2, /; q=.2
Connection: keep-alive

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:

GET /newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg HTTP / 1.1

用户代理：Mozilla / 5.0（Macintosh; Intel Mac OS X 10_7_5）AppleWebKit / 537.31（KHTML，与Gecko一样）Chrome / 26.0.1410.65 Safari / 537.31

主机：www .earthtimes.org

接受：text / html，image / gif，image / jpeg，*; q = .2， / ; q = .2

连接：keep-alive

GET /newsimage/osteoderms-storing-minerals-helped-huge-dinosaurs-survive_3011.jpg HTTP/1.1
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
Host: www.earthtimes.org
Accept: text/html, image/gif, image/jpeg, *; q=.2, /; q=.2
Connection: keep-alive

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IT屋！