iamberry-watero/watero-common-tool/src/main/java/com/iamberry/wechat/tools/DownloadWXCodeUtil.java

package com.iamberry.wechat.tools;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class DownloadWXCodeUtil {
    /**
     * 下载微信二维码
     * @param urlString
     * @param filename 存储名称
     * @param savePath  路径
     * @param width 宽度
     * @param height 高度
     * @throws Exception
     */
    public static void download(String urlString, String filename,String savePath,int width,int height) throws Exception {

        // 输出的文件流
        File sf=new File(savePath);
        if(!sf.exists()){
            sf.mkdirs();
        }
        // 构造URL
        URL url = new URL(urlString);
        // 打开连接
        URLConnection con = url.openConnection();
        //设置请求超时为5s
        con.setConnectTimeout(5*1000);
        // 输入流
        InputStream is = con.getInputStream();

        BufferedImage bi = ImageIO.read(is);
        ImageIO.write(bi, "png", new File(savePath+filename));

//        JPEGImageDecoder decoderFile = JPEGCodec.createJPEGDecoder(is);
//        BufferedImage image = decoderFile.decodeAsBufferedImage();

//        Image srcImg = image;
//        image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//        image.getGraphics().drawImage(srcImg.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0,0, null);
//        ImageIO.write(image, "JPEG", new File(savePath+filename));
        is.close();
    }

    /**
     * 下载微信二维码
     * @param url
     * @param filename
     * @param savePath
     * @param width
     * @param height
     * @param isCircular 是否为圆
     */
    public static void downloadByNIO2(String url,  String filename,String savePath,int width,int height,boolean isCircular) {
        try (InputStream ins = new URL(url).openStream()) {
            BufferedImage bi = ImageIO.read(ins);
            if(isCircular){
                int w = width;
                int h = height;
                BufferedImage output = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
                Graphics2D g2 = output.createGraphics();
                output = g2.getDeviceConfiguration().createCompatibleImage(w, h, Transparency.TRANSLUCENT);
                g2.dispose();
                g2 = output.createGraphics();
                g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2.fillRoundRect(0, 0,w, h, 720, 720);
                g2.setComposite(AlphaComposite.SrcIn);
                g2.drawImage(bi, 0, 0, w, h, null);
                g2.dispose();
                ImageIO.write(output, "png", new File(savePath+filename));
            }else{
                Image srcImg = bi;
                bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
                bi.getGraphics().drawImage(srcImg.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0,0, null);
                ImageIO.write(bi, "png", new File(savePath+filename));
            }
            ins.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}