创建JPEG文件：转换访问限制code（JPEGImageEn codeR）至＆QUOT;安全＆QUOT; code [英] Creating JPEGs: converting access restricted code (JPEGImageEncoder) to "safe" code

问题描述

我得到以下code，和Eclipse标志着它（在 JPEGImageEn codeR 线）错误（访问限制）。我改变了Eclipse的选项，以使该code编译，但我读到的错误意味着这个类（ JPEGImageEn codeR ）可能不会被一些JRE实现实现（未在Sun / Oracle的一个）。

那么，究竟应该是code，它不会有准入限制，即完全安全的code做同样的事情（创建一个JPG图片）？

 的BufferedOutputStream出=新的BufferedOutputStream（新的FileOutputStream（文件名））;
JPEGImageEn codeR EN codeR = JPEG codec.createJPEGEn codeR（出）;
JPEGEn codeParam参数= EN coder.getDefaultJPEGEn codeParam（buffImage）;
param.setQuality（0.8f，FALSE）;
EN coder.en code（buffImage，参数）;
 

解决方案

也许我误解了，但如果你希望做一个BufferedImage对象保存为JPEG格式，你可以这样（从Java 1.4起做）：

  ImageIO.write（BufferedImage的，JPG，文件）;
 

下面是包含更多信息的链接： http://download.oracle .COM / JavaSE的/教程/ 2D /图像/ saveimage.html

正如你所看到的，它说，JPEG，PNG，GIF，BMP和WBMP会一直支持。

如果你想设置COM pression /质量，这是多一点的工作，但不会太大。假设你有一个BufferedImage的和不过outFile：

  IIOImage中outputImage =新方法IIOImage（BufferedImage的，NULL，NULL）;ImageWriter的作家= ImageIO.getImageWritersByFormatName（JPEG）下一个（）。
writer.setOutput（新FileImageOutputStream（不过outFile））;
的ImageWriteParam writeParam = writer.getDefaultWriteParam（）;
writeParam.setCom pressionMode（ImageWriteParam.MODE_EXPLICIT）;
writeParam.setCom pressionQuality（.75f）; //浮动0和1之间，1表示最大质量。
writer.write（NULL，outputImage，writeParam）;
 

（由previous答案固定）

I was given the following code, and Eclipse marked it (at the JPEGImageEncoder line) as an error (Access restriction). I changed Eclipse options to make that code compile, but I read that the error means that that class (JPEGImageEncoder) may not be implemented by some JRE implementation (not a Sun/Oracle one).

So, what should be the code that wouldn't have access restrictions, i.e. completely safe code to do the same thing (create a JPG image)?

BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(filename));
JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(buffImage);
param.setQuality(0.8f, false);
encoder.encode(buffImage, param);

解决方案

Maybe I've misunderstood, but if all you're looking to do is save a BufferedImage object as a jpeg, you can do this (from Java 1.4 onwards):

ImageIO.write(bufferedImage,"jpg",file);

Here's a link with more information: http://download.oracle.com/javase/tutorial/2d/images/saveimage.html

As you can see, it says that JPEG, PNG, GIF, BMP and WBMP will always be supported.

If you want to set the compression/quality, it's a little more work but not too much. Assuming you have a bufferedImage and an outFile:

IIOImage outputImage = new IIOImage(bufferedImage, null, null);

ImageWriter writer = ImageIO.getImageWritersByFormatName("jpeg").next();        
writer.setOutput(new FileImageOutputStream(outFile));
ImageWriteParam writeParam = writer.getDefaultWriteParam();
writeParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
writeParam.setCompressionQuality(.75f); // float between 0 and 1, 1 for max quality.
writer.write( null, outputImage, writeParam);

(fixed from previous answer)

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