圖像壓縮應用程序

Question

UI出錯，無法傳遞2個文本框中的數據或用戶在單擊按鈕以壓縮圖像時選擇的路徑。

下面是代碼：

// 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); 
} 

在此我有兩個文本框和兩個按鈕一個按鈕，用於選擇從M/C和其他按鈕的圖像用於選擇其中圖像必須是目標文件夾保存。

第三個按鈕用於壓縮圖像文件。

Answer 1

你在第

// this is the button for choosing an image file 

，並在部分

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

代碼是完全一樣的，jButton6應該是變化和jtextfield1應該根據自己的UI改變。

它會解決我猜的問題。

好運