Java 使用给定的 url 获取图像并将其转换为字节数组
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Get image with given url and convert it to byte array
提问by emilan
I have an image url (http://example.com/myimage.jpg) and want to convert it to byte array and save it in my DB.
我有一个图像 url ( http://example.com/myimage.jpg) 并希望将其转换为字节数组并将其保存在我的数据库中。
I did the following, but getting this message URI scheme is not "file"
我做了以下，但收到这条消息 URI scheme is not "file"
URI uri = new URI(profileImgUrl);
File fnew = new File(uri);
BufferedImage originalImage=ImageIO.read(fnew);
ByteArrayOutputStream baos=new ByteArrayOutputStream();
ImageIO.write(originalImage, "jpg", baos );
byte[] imageInByte=baos.toByteArray();
采纳答案by Srikanth Reddy Lingala
The Javadocfor File(URI)constructor specifies that the uri has to be a "File" URI. In other words, it should start with "file:"
该的Javadoc用于File(URI)该URI具有构造函数指定为“文件” URI。换句话说，它应该以“file:”开头
uriAn absolute, hierarchical URI with a scheme equal to "file", a non-empty path component, and undefined authority, query, and fragment components
uri一个绝对的分层 URI，其方案等于“文件”、一个非空路径组件以及未定义的权限、查询和片段组件
But you can achieve what you are trying to do by using an URL, instead of a File/URI:
但是您可以通过使用 URL 而不是文件/URI 来实现您想要做的事情：
URL imageURL = new URL(profileImgUrl);
BufferedImage originalImage=ImageIO.read(imageURL);
ByteArrayOutputStream baos=new ByteArrayOutputStream();
ImageIO.write(originalImage, "jpg", baos );
//Persist - in this case to a file
FileOutputStream fos = new FileOutputStream("outputImageName.jpg");
baos.writeTo(fos);
fos.close();
