Shulou(Shulou.com)06/02 Report--

In this issue, Xiaobian will bring you about how to realize the image compression function in Java. The article is rich in content and analyzed and described from a professional perspective. After reading this article, I hope you can gain something.

/** isoscale compressed original * @param url * Picture Network Address * @ pardestam Width Width to compress * @ pardestam Height Height to compress * @param outputDir Output Directory * @param filename File name **/ public static String thumbnail(URL url, int destWidth, int destHeight,String outputDir,String filename){ System.out.println("Image compression start"); long startTime = System.currentTimeMillis(); String returnurl =""; //compressed image location try { //read original BufferedImage BI = ImageIO.read(url); int srcWidth = BI.getWidth(); //original width int srcHeight = BI.getHeight(); //original height returnurl = outputDir+File.separatorChar+filename; OutputStream fos =new FileOutputStream(returnurl); if(srcWidth>=destWidth || srcHeight>=destWidth) { double sx = (double) destWidth / srcWidth; double sy = (double) destHeight / srcHeight; //scaling if (sx > sy) { sx = sy; destWidth = (int) (sx * srcWidth); } else { sy = sx; destHeight = (int) (sy * srcHeight); } } //SCALE_SMOOTH compression algorithm may have some impact on picture sharpness, but it is still within acceptable range Image image = BI.getScaledInstance(destWidth, destHeight, Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage(destWidth, destHeight,BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.setColor(Color.RED); g.drawImage(image, 0, 0, null); //Draw the processed graph g.dispose(); ImageIO.write(tag, "JPEG", fos); System.out.println("Image compression ends"); long endTime = System.currentTimeMillis(); System.out.println("Total Image Compression Time: " +(endTime-startTime)+"ms" ); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return returnurl; } The above is how to implement the image compression function in Java shared by Xiaobian. If there is a similar doubt, please refer to the above analysis for understanding. If you want to know more about it, please pay attention to the industry information channel.

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