1.添加依赖
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.2.1</version>
</dependency>
2.QrCodeUtils类
主方法也在这里点击运行就行
import com.alibaba.fastjson.JSONObject;
import com.google.zxing.Result;
import com.google.zxing.*;
import com.google.zxing.common.HybridBinarizer;
import com.zhibi.cms.set.MiniProgram;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* 作者qq1023732997
*/
public class QrCodeUtils {
public static String decodeQrcode(BufferedImage image) throws NotFoundException {
MultiFormatReader formatReader = new MultiFormatReader();
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
//定义二维码的参数:
Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");//定义字符集
hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
com.google.zxing.Result result = formatReader.decode(binaryBitmap, hints);//开始解析
return result.getText();
}
public static String getToken() {
try {
Map<String, String> map = new LinkedHashMap<String, String>();
map.put("grant_type", "client_credential");
map.put("appid", MiniProgram.APP_ID);// 改成自己的appid
map.put("secret", MiniProgram.APP_secret); //改成自己的secret
String rt = UrlUtil.sendPost("https://api.weixin.qq.com/cgi-bin/token", map);
JSONObject json = JSONObject.parseObject(rt);
if (json.getString("access_token") != null || json.getString("access_token") != "") {
return json.getString("access_token");
} else {
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static void main(String[] args) {
try {
URL url = new URL("https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=" + getToken());
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");// 提交模式
// conn.setConnectTimeout(10000);//连接超时 单位毫秒
// conn.setReadTimeout(2000);//读取超时 单位毫秒
// 发送POST请求必须设置如下两行
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
// 获取URLConnection对象对应的输出流
PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
// 发送请求参数
JSONObject paramJson = new JSONObject();
paramJson.put("scene", "");//参数
paramJson.put("path", "pages/index");
paramJson.put("width", 430);
printWriter.write(paramJson.toString());
// flush输出流的缓冲
printWriter.flush();
//开始获取数据
BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100];
int rc = 0;
while ((rc = bis.read(buff, 0, 100)) > 0) {
swapStream.write(buff, 0, rc);
}
ByteArrayInputStream inputStream = new ByteArrayInputStream(swapStream.toByteArray());
BufferedImage image = ImageIO.read(inputStream);
BufferedImage subImage = image.getSubimage(0, 0, image.getWidth(), (int) (image.getHeight() * 0.85));
BufferedImage inputbig = new BufferedImage(256, 256, BufferedImage.TYPE_INT_BGR);
Graphics2D g = (Graphics2D) inputbig.getGraphics();
g.drawImage(subImage, 0, 0, 256, 256, null);
g.dispose();
inputbig.flush();
ImageIO.write(inputbig, "jpg", new File("D:\\云上\\ewm.png"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
3.BufferedImageLuminanceSource
import com.google.zxing.LuminanceSource;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
public final class BufferedImageLuminanceSource extends LuminanceSource {
private final BufferedImage image;
private final int left;
private final int top;
public BufferedImageLuminanceSource(BufferedImage image) {
this(image, 0, 0, image.getWidth(), image.getHeight());
}
public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
super(width, height);
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
if (left + width > sourceWidth || top + height > sourceHeight) {
throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
}
for (int y = top; y < top + height; y++) {
for (int x = left; x < left + width; x++) {
if ((image.getRGB(x, y) & 0xFF000000) == 0) {
image.setRGB(x, y, 0xFFFFFFFF); // = white
}
}
}
this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image, 0, 0, null);
this.left = left;
this.top = top;
}
@Override
public byte[] getRow(int y, byte[] row) {
if (y < 0 || y >= getHeight()) {
throw new IllegalArgumentException("Requested row is outside the image: " + y);
}
int width = getWidth();
if (row == null || row.length < width) {
row = new byte[width];
}
image.getRaster().getDataElements(left, top + y, width, 1, row);
return row;
}
@Override
public byte[] getMatrix() {
int width = getWidth();
int height = getHeight();
int area = width * height;
byte[] matrix = new byte[area];
image.getRaster().getDataElements(left, top, width, height, matrix);
return matrix;
}
@Override
public boolean isCropSupported() {
return true;
}
@Override
public LuminanceSource crop(int left, int top, int width, int height) {
return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
}
@Override
public boolean isRotateSupported() {
return true;
}
@Override
public LuminanceSource rotateCounterClockwise() {
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g = rotatedImage.createGraphics();
g.drawImage(image, transform, null);
g.dispose();
int width = getWidth();
return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
}
}
