如何从Java中读取URL中的图像？ [英] How can I read image from URL in Java?

问题描述

我的web应用程序中有servlet提供图像，当我访问那些带有浏览器图像的URL时，服务器是正确的。然后我有另一个调整图像大小的servlet，想法是在resize servlet中通过url访问get图像，然后调整图像大小。但由于某种原因，以下所有方法都返回null，但是当我使用浏览器访问给定URL时，图像显示正确。

I have servlet in my web application that serves images, and when I visit those urls with browser images are server correctly. Then I have this other servlet that resizes images, idea is to visit get image by url in resize servlet and then resize image. But for some reason all following methods return null, but when I visit given url with browser, image is shown correctly.

    URL imageURL = new URL(fullUrl);
    // Case 1
    RenderedImage img = ImageIO.read(imageURL);

    // Case 2
    BufferedImage img = JAI.create("url", imageURL).getAsBufferedImage();

    // Case 3
    Image img = java.awt.Toolkit.getDefaultToolkit().getDefaultToolkit().createImage(imageURL);

推荐答案

URL url = new URL("http://www.digitalphotoartistry.com/rose1.jpg");
Image image = ImageIO.read(url);  

或

URL url = new URL("http://www.digitalphotoartistry.com/rose1.jpg");
java.awt.Image image = java.awt.Toolkit.getDefaultToolkit().createImage(url);   

更新：

此代码适用于我
尝试检查您的网址。

This code works for me Try checking your URL.

public static void main(String[] args) throws Exception {
   URL imageURL = new URL("http://www.digitalphotoartistry.com/rose1.jpg");
    // Case 1
    RenderedImage img = ImageIO.read(imageURL);
    System.out.println(img);
}

输出：

BufferedImage@e80a59: type = 5 ColorModel: #pixelBits = 24 numComponents = 3 col
or space = java.awt.color.ICC_ColorSpace@1ff5ea7 transparency = 1 has alpha = fa
lse isAlphaPre = false ByteInterleavedRaster: width = 553 height = 737 #numDataE
lements 3 dataOff[0] = 2

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