课程管理学习端修改

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2022-11-18 b6a92bcd70d2edfb8bf2a2e784b37e1fcd036c10

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package com.qxueyou.scc.base.util;
 
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
 
import javax.imageio.ImageIO;
 
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
 
import sun.misc.BASE64Encoder;
@SuppressWarnings("restriction")
public class ImageUtils {
 
    private static Logger log = LogManager.getLogger("ImageUtils");
 
    public static void doBeautiful(File file) {
 
        try {
            BufferedImage bi1 = ImageIO.read(file);
            Ellipse2D.Double shapeEllipse = new Ellipse2D.Double(0, 0, Math.min(bi1.getWidth(),bi1.getHeight()),
                    Math.min(bi1.getWidth(),bi1.getHeight()));
 
            // ÉèÖÃ͸Ã÷±³¾°
            BufferedImage bi2 = new BufferedImage(bi1.getWidth(),
                    bi1.getHeight(), BufferedImage.TRANSLUCENT);
            Graphics2D g2 = bi2.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setClip(shapeEllipse);
 
            // »­Í¼Æ¬
            g2.drawImage(bi1, 0, 0, null);
            g2.dispose();
 
            ImageIO.write(bi2, "PNG", file);
 
        } catch (IOException e) {
            log.error("ͼƬ´¦Àíʧ°Ü", e);
        }
    }
    //¾ØÐÎÍ·Ïñ
    public static void doRectangle(File file){
        try {
            BufferedImage bi1 = ImageIO.read(file);
            Rectangle2D.Double shapeRectangle = new Rectangle2D.Double(0, 0, Math.min(bi1.getWidth(),bi1.getHeight()),
                    Math.min(bi1.getWidth(),bi1.getHeight()));
 
            // ÉèÖÃ͸Ã÷±³¾°
            BufferedImage bi2 = new BufferedImage(bi1.getWidth(),
                    bi1.getHeight(), BufferedImage.TRANSLUCENT);
            Graphics2D g2 = bi2.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2.setClip(shapeRectangle);
 
            // »­Í¼Æ¬
            g2.drawImage(bi1, 0, 0, null);
            g2.dispose();
 
            ImageIO.write(bi2, "PNG", file);
 
        } catch (IOException e) {
            log.error("ͼƬ´¦Àíʧ°Ü", e);
        }
    }
    
    /**
     * ÎªÍ¼Æ¬Éú³ÉËõÂÔͼ
     * @param file
     */
    public static void decreaseSizeImage(File file) {
 
        try {
            
            BufferedImage bi1 = ImageIO.read(file);
            
 
            int width = bi1.getWidth();
            int height = bi1.getHeight();
            
 
            // ÉèÖÃ͸Ã÷±³¾°
            BufferedImage bi2 = new BufferedImage(getPriviewImageWidth(width,height),
                    getPriviewImageHeight(width,height), bi1.getType());
            Graphics2D g2 = bi2.createGraphics();
 
            // »­Í¼Æ¬
            Image image = bi1.getScaledInstance(getPriviewImageWidth(width,height), getPriviewImageHeight(width,height), Image.SCALE_DEFAULT);  
            g2.drawImage(image, 0, 0, null);
            g2.dispose();
 
            ImageIO.write(bi2, "PNG", createPreviewFile(file));
 
        } catch (IOException e) {
            log.error("ͼƬ´¦Àíʧ°Ü", e);
        }
    }
    
    public static File createPreviewFile(File f){
        return new File(f.getParentFile().getAbsolutePath().concat("/pre_").concat(f.getName()));
    }
    
    private static int getPriviewImageWidth(int width,int height){
        double wid = width;
        double hei = height;
        
        double ratioWid = wid / 120;
        double ratioHeight = hei / 160;
        
        if(ratioWid >= ratioHeight){
            return 120;
        }else{
            return (int) (wid/ratioHeight);
        }
    }
    
    private static int getPriviewImageHeight(int width,int height){
        double wid = width;
        double hei = height;
        
        double ratioWid = wid / 120;
        double ratioHeight = hei / 160;
        
        if(ratioWid >= ratioHeight){
            return (int) (hei/ratioWid);
        }else{
            return 160;
        }
    }
    
    public static String encodeImgageToBase64(String imgStr) { // ½«Í¼Æ¬Îļþת»¯Îª×Ö½ÚÊý×é×Ö·û´®£¬²¢¶ÔÆä½øÐÐBase64±àÂë´¦Àí  
        
        
        ByteArrayOutputStream outputStream = null;  
        try {  
            URL imageUrl=   new URL(imgStr); 
            BufferedImage bufferedImage = ImageIO.read(imageUrl);  
            outputStream = new ByteArrayOutputStream();  
            ImageIO.write(bufferedImage, "jpg", outputStream);  
        } catch (MalformedURLException e1) {  
            e1.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        // ¶Ô×Ö½ÚÊý×éBase64±àÂë  
        BASE64Encoder encoder = new BASE64Encoder();  
        return encoder.encode(outputStream.toByteArray());// ·µ»ØBase64±àÂë¹ýµÄ×Ö½ÚÊý×é×Ö·û´®  
    } 
    
    public static void main(String[] args){
        
        doRectangle(new File("C:/Users/Public/Pictures/Sample Pictures/desert.jpg"));
    }
}