将图像的URL字符串转换为字节数组

Question

我有一个来自RestTemplate get result的图片内容：

String url = "https://is2-ssl.mzstatic.com/image/" +
        "thumb/Purple114/v4/15/a1/68/15a1681f-dec4-b01f-4362" +
        "-e9ff1ece9c09/AppIcon-1x_U007emarketing-0-10-0-0-85" +
        "-220-0.png/60x60bb.png";
String imageAsString = restTemplate.getForObject(url, String.class);

我知道这不是通过RestTemplate获取图像的正确方式。但我应该把它留在我的旧代码里。

如何将该值转换为右图像字节数组格式？

imageAsString.getBytes() ->这与restTemplate.getForObject(url, byte[].class);不同

Answer 1

如果您有一个镜像URL，您可以先将其read(https://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#read(java.net.URL%29)为BufferedImage，然后将其write(https://docs.oracle.com/javase/7/docs/api/javax/imageio/ImageIO.html#write(java.awt.image.RenderedImage,%20java.lang.String,%20java.io.OutputStream%29)为FileOutputStream，如下所示：

public static void main(String[] args) throws IOException {
    URL url = new URL("https://is2-ssl.mzstatic.com/image/" +
            "thumb/Purple114/v4/15/a1/68/15a1681f-dec4-b01f-4362" +
            "-e9ff1ece9c09/AppIcon-1x_U007emarketing-0-10-0-0-85" +
            "-220-0.png/60x60bb.png");

    BufferedImage bufferedImage = ImageIO.read(url);

    ImageIO.write(bufferedImage, "png",
            new FileOutputStream("resources/bufferedImage.png"));
}

这是图片：bufferedImage.png

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