用于ImageIO的Mimetypes read（）和write（）

I am trying to use Mime Types to define the output for ImageIO. The simple write() method

我正在尝试使用Mime Types来定义ImageIO的输出。简单的write（）方法

public static boolean write(RenderedImage im,
            String formatName,
            OutputStream output)
                     throws IOException

uses " informal name of the format." (e.g. "png"). Is there a simple equivalent for mimetypes (e.g. "image/png") or failing that code that achieves the purpose of writing an image? The only starting point I have found is

使用“格式的非正式名称”。（例如“png”）。是否存在mimetypes的简单等价物（例如“image / png”）或者是否达不到编写图像目的的代码？我发现的唯一起点是

public static Iterator<ImageWriter> getImageWritersByMIMEType(String MIMEType)

which seems much more complex, requiring ImageWriter, IIOStream etc. and I haven't managed to create a solution.

这似乎要复杂得多，需要ImageWriter，IIOStream等，而我还没有设法创建解决方案。

UPDATE: The reason I am using MIME is that it is a formal part of the image in SVG, e.g.

更新：我使用MIME的原因是它是SVG中图像的正式部分，例如

 xlink:href="data:image/png;base64,iVBORw0KGgoAAAA...

and it seemed appropriate to use it rather than converting it to less defined "informal" formats. I managed to find a precise solution (in java2s.com) to my question and have added it as an answer.

使用它而不是将其转换为不太明确的“非正式”格式似乎是合适的。我设法在我的问题中找到了一个精确的解决方案（在java2s.com中），并将其添加为答案。

2 个解决方案

#1

I have now found a formal solution to my question on a java2s tutorial

我现在已经找到了一个关于java2s教程的问题的正式解决方案

public class Main {
  static public void main(String args[]) throws Exception {
    int width = 200, height = 200;
    BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

    Graphics2D ig2 = bi.createGraphics();
    ig2.fillRect(0, 0, width - 1, height - 1);

    Iterator imageWriters = getImageWritersByMIMEType("image/gif");
    ImageWriter imageWriter = (ImageWriter) imageWriters.next();
    File file = new File("filename.gif");
    ImageOutputStream ios = ImageIO.createImageOutputStream(file);
    imageWriter.setOutput(ios);
    imageWriter.write(bi);
  }

(edited as corrected by @haraldK ).

（编辑经@haraldK更正）。

#2

I printed the list of ImageIO informal formats, using the getReaderFormatNames method, on my Windows XP, Java 6 computer.

我在Windows XP，Java 6计算机上使用getReaderFormatNames方法打印了ImageIO非正式格式列表。

BMP, bmp, jpg, JPG, wbmp, jpeg, png, PNG, JPEG, WBMP, GIF, gif

Here are the equivalent MIME types

以下是等效的MIME类型

image/bmp
image/jpeg
image/png
image/gif

I couldn't find a MIME for the WBMP format.

我找不到WBMP格式的MIME。

Seems like you could just strip off the "image/" from the MIME to pass the informal format to the ImageIO read or write methods.

好像您可以从MIME中剥离“image /”以将非正式格式传递给ImageIO读取或写入方法。

#1