java - 使用压缩的缓冲图像转换

Question

尝试读取缓冲的 bmp 图像，然后压缩转换为 jpeg。缓冲图像行有问题。谢谢，非常感谢您的帮助。

public void jpegconvert(String Fname, String Crate)
{

BufferedImage image =  ImageIO.read(Fname);

Iterator<ImageWriter> i = ImageIO.getImageWritersByFormatName("jpeg"); 

// Just get the first JPEG writer available 
ImageWriter jpegWriter = i.next(); 

// Set the compression quality to 0.8 
ImageWriteParam param = jpegWriter.getDefaultWriteParam(); 
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); 
param.setCompressionQuality(0.8f); 

// Write the image to a file 
FileImageOutputStream out = new FileImageOutputStream(new File("newimage.jpg")); 
jpegWriter.setOutput(out); 
jpegWriter.write(null, new IIOImage(image, null, null), param); 
jpegWriter.dispose(); 
out.close();
}
}

悬停错误表示:

no suitable method found for read(String)
    method ImageIO.read(ImageInputStream) is not applicable
      (actual argument String cannot be converted to ImageInputStream by method invocation conversion)
    method ImageIO.read(URL) is not applicable
      (actual argument String cannot be converted to URL by method invocation conversion)
    method ImageIO.read(InputStream) is not applicable
      (actual argument String cannot be converted to InputStream by method invocation conversion)
    method ImageIO.read(File) is not applicable
      (actual argument String cannot be converted to File by method invocation conversion)

Answer 1

问题出在这个特定的代码上:
ImageIO.read(Fname);
因为 Fname 是一个 String 并检查 API for read method它在任何重载方法中都不采用 String 作为参数

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