使用给定的URL获取图像并将其转换为字节数组 [英] Get image with given url and convert it to byte array

问题描述

我有一个图片网址（ 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。请帮助我一些例子。

我做了以下，但得到这个消息 URI方案不是文件

  URI uri = new URI（profileImgUrl）; 
档案fnew =新档案（uri）; 
 BufferedImage originalImage = ImageIO.read（fnew）; 
 ByteArrayOutputStream baos = new ByteArrayOutputStream（）; 
 ImageIO.write（originalImage，jpg，baos）; 
 byte [] imageInByte = baos.toByteArray（）; 
  

解决方案

Javadoc for （URI）构造函数指定uri必须是FileURI。换句话说，它应该以file：开始。

uri 等于文件，
非空路径组件，以及未定义的权限，查询和片段
组件

但是，您可以通过使用URL而不是File / URI来实现您正在尝试执行的操作：

  URL imageURL =新的URL（profileImgUrl）; 
 BufferedImage originalImage = ImageIO.read（imageURL）; 
 ByteArrayOutputStream baos = new ByteArrayOutputStream（）; 
 ImageIO.write（originalImage，jpg，baos）; 
 
 //坚持 - 在这种情况下是文件
 
 FileOutputStream fos = new FileOutputStream（outputImageName.jpg）; 
 baos.writeTo（fos）; 
 fos.close（）; 
  

I have an image url (http://example.com/myimage.jpg) and want to convert it to byte array and save it in my DB. Pls help me with some example.

I did the following, but getting this message 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();

解决方案

The Javadoc for File(URI) constructor specifies that the uri has to be a "File" URI. In other words, it should start with "file:"

uri An absolute, hierarchical URI with a scheme equal to "file", a non-empty path component, and undefined authority, query, and fragment components

But you can achieve what you are trying to do by using an URL, instead of a File/URI:

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();

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