图像压缩应用

Question

UI中的错误，无法在两个文本字段中传递数据，或者当单击Button以压缩图像时用户选择的路径。

以下是代码：

    // this is the button when clicked should compress the image 
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {              
        File imageFile = new File("myimage.jpg");
        File compressedImageFile = new File("myimage_compressed.jpg");

         try
         {
            InputStream is = new FileInputStream(imageFile);
            OutputStream os = new FileOutputStream(compressedImageFile);
            float quality = 0.5f;

            // create a BufferedImage as the result of decoding the supplied InputStream
            BufferedImage image = ImageIO.read(is);

            // get all image writers for JPG format
            Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");

            if (!writers.hasNext())
                throw new IllegalStateException("No writers found");
            ImageWriter writer = (ImageWriter) writers.next();
            ImageOutputStream ios = ImageIO.createImageOutputStream(os);
            writer.setOutput(ios);

            ImageWriteParam param = writer.getDefaultWriteParam();

            // compress to a given quality
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            param.setCompressionQuality(quality);

            // appends a complete image stream containing a single image and
            //associated stream and image metadata and thumbnails to the output
            writer.write(null, new IIOImage(image, null, null), param);

            // close all streams
            is.close();
            os.close();
            ios.close();
            writer.dispose();
     }
     catch(IOException e)
     {
         System.out.println(e);
     }

} 


// this is the  button for choosing an image file 
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {   
    JFileChooser chooser=new JFileChooser();
    FileNameExtensionFilter imgfilter=new FileNameExtensionFilter("Image files", "jpg");

    chooser.setFileFilter(imgfilter);
    chooser.showOpenDialog(null);

    File f=chooser.getSelectedFile();
    String filename=f.getAbsolutePath();

    jTextField1.setText(filename); 
}



// this is the button  for choosing the destination folder for compressed  image to be saved                                      

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    JFileChooser chooser=new JFileChooser();
    FileNameExtensionFilter imgfilter=new FileNameExtensionFilter("Image files", "jpg");
    chooser.setFileFilter(imgfilter);
    chooser.showOpenDialog(null);
    File f=chooser.getSelectedFile();
    String filename=f.getAbsolutePath();
    jTextField1.setText(filename);
}   

在这里，我有两个文本字段和两个按钮，一个按钮用于从m/c选择图像，另一个按钮用于选择必须保存图像的目标文件夹。

还有第三个按钮，用于压缩图像文件。

Answer 1

您的代码在部分

// this is the  button for choosing an image file 

和在部分

// this is the button  for choosing the destination folder for compressed  image to be saved                                    

完全相同，jButton6应该更改，jtextfield1应该根据UI进行更改。

我想它能解决这个问题。

祝好运