使用JAVA生成带二维码和头像的微信海报，并通过公众号发送给用户

使用JAVA生成带二维码和头像的微信海报，并通过公众号发送给用户。

“`java

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import weixin.popular.api.MediaAPI;
import weixin.popular.api.MessageAPI;
import weixin.popular.bean.media.Media;
import weixin.popular.bean.media.MediaType;
import weixin.popular.bean.message.message.ImageMessage;
import weixin.popular.bean.message.message.TextMessage;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.util.Hashtable;

public class ImageUtils {

<pre class="prism-highlight line-numbers" data-start="1"><code class="language-null">public static final String CHARSET = "utf8";
// 海报模板位置
public static final String IMG_TEMP = "temp/";

public static InputStream genPosterToInputStream(String qrCodeText, String avatarUrl) throws Exception {
BufferedImage avatar = getAvatar(avatarUrl);
File posterTemp = new File(IMG_TEMP + "poster.png");
System.out.printf("posterTemp:" + posterTemp.getAbsolutePath());
BufferedImage big = ImageIO.read(posterTemp);
BufferedImage code = createQrCode(qrCodeText, false);
Graphics2D g = big.createGraphics();
//画二维码
g.drawImage(code, 510, 910, code.getWidth(), code.getHeight(), null);
//画头像
g.drawImage(avatar, 100, 760, 100, 100, null);
g.dispose();
FileUtils.mkdirs(new File(IMG_TEMP));
ByteArrayOutputStream os = new ByteArrayOutputStream();
ImageIO.write(big, "png", os);
InputStream is = new ByteArrayInputStream(os.toByteArray());
return is;
}

private static BufferedImage createQrCode(String content, boolean needCompress) throws IOException, WriterException {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
hints.put(EncodeHintType.MARGIN, 0);
//200是定义的二维码或小图片的大小
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200, hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//循环遍历每一个像素点
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
return image;
}

private static BufferedImage getAvatar(String imageUrl) throws Exception {
System.out.println("avatarUrl:" + imageUrl);
BufferedImage avatarImage = ImageIO.read(new URL(imageUrl));
int width = 100;
BufferedImage formatAvatarImage = new BufferedImage(width, width, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D graphics = formatAvatarImage.createGraphics();
//把图片切成一个圓

graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//留一个像素的空白区域，这个很重要，画圆的时候把这个覆盖
int border = 1;
//图片是一个圆型
Ellipse2D.Double shape = new Ellipse2D.Double(border, border, width – border * 2, width – border * 2);
//需要保留的区域
graphics.setClip(shape);
graphics.drawImage(avatarImage, border, border, width – border * 2, width – border * 2, null);
graphics.dispose();

//在圆图外面再画一个圆
//新创建一个graphics，这样画的圆不会有锯齿
graphics = formatAvatarImage.createGraphics();
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int border1 = 3;
//画笔是4.5个像素，BasicStroke的使用可以查看下面的参考文档
//使画笔时基本会像外延伸一定像素，具体可以自己使用的时候测试
Stroke s = new BasicStroke(4.5F, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
graphics.setStroke(s);
graphics.setColor(Color.WHITE);
graphics.drawOval(border1, border1, width – border1 * 2, width – border1 * 2);
graphics.dispose();
return formatAvatarImage;
}

public static void main(String[] args) throws Exception {
//微信accessToken
String access_token = "";
//用户openId
String openId = "";

InputStream is = genPosterToInputStream("https://213.name", "http://thirdwx.qlogo.cn/mmopen/vi_32/ZZQmj4qENOHWJerYzIliasnE6NiasibY9SfIhyNeBxTlUrxaIojtjpdwU1ATbjqhbpjKbTib2XwEKiaLmaM4ialZdqyA/132");
//上传微信临时素材
Media media = MediaAPI.mediaUpload(access_token, MediaType.image, is);
System.out.println("mediaId:" + media.getMedia_id());
System.out.println("mediaUrl" + media.getUrl());

//发送文本消息
TextMessage textMessage2 = new TextMessage(openId, "海报测试");
MessageAPI.messageCustomSend(access_token, textMessage2);

//发送图片消息
ImageMessage imageMessage = new ImageMessage(openId, media.getMedia_id());
MessageAPI.messageCustomSend(access_token, imageMessage);
}
</code></pre>

}

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