一、问题描述
最近公司有个需求是,从小程序哪里获取二维码,然后从二维码中解析出URL来,自己定制下二维码。。。嫌微信生成的码太难看了。。。微信小程序的获取二维码的文档如下:https://developers.weixin.qq.com/miniprogram/dev/api/qrcode.html 看着这个文档。。。就想吐槽下。。写的太含糊了。
竟然没写返回值是什么。。最后得知,它是以流的形式返回。。。文档里有三A、B、C三种类型的接口,不清楚微信怎么想的。。。分这么多种接口,做什么。。A,B接口有生成次数限制,B接口没有限制。。
测试代码如下:
public class Test { public static void main(String[] args) { try { URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=你的access_token"); 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", "a=1234567890"); paramJson.put("page", "pages/index/index"); paramJson.put("width", 430); paramJson.put("auto_color", true); /** * line_color生效 * paramJson.put("auto_color", false); * JSONObject lineColor = new JSONObject(); * lineColor.put("r", 0); * lineColor.put("g", 0); * lineColor.put("b", 0); * paramJson.put("line_color", lineColor); * */ 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()); OutputStream os = new FileOutputStream(new File("/Users/Xxxx/Music/abc.png")); int len; byte[] arr = new byte[1024]; while ((len = bis.read(arr)) != -1) { os.write(arr, 0, len); os.flush(); } os.close(); } catch (Exception e) { e.printStackTrace(); } } }
生成的二维码如下:
扫描二维码关注公众号,回复:
39071 查看本文章
但是这种二维码不管怎么搞,都解析不出来二维码中的数据,我试了QRCode.jar与Zxing都不能解析出来,都是报:
com.google.zxing.NotFoundException这种错,网上说是二维码复杂了,或者是中间有LOGO的时候就报错。。但是C接口返回的二维码
通过Zxing解析是也报上面那种错,但是在网上找到了中解决方法,把二维码下面的那串中文去掉就可以了。
二、解决方法
解决方法如下,在微信返回的流中,对图片解析截取:
ByteArrayInputStream inputStream= new ByteArrayInputStream(swapStream.toByteArray()); BufferedImage image = ImageIO.read(inputStream); /**裁剪原图 目前访问微信 微信返回的是 470*535 像素 170620*/ BufferedImage subImage = image.getSubimage(0, 0, image.getWidth(), (int) (image.getHeight() * 0.85));
把下面的中文去掉,效果如下
相对应的URL为:
https://mp.weixin.qq.com/a/~~JtIAAAEESEGtXoPLOk~fPZXTPs0T7Y3SaxauUqasw~~
完整代码如下:
1.引入Zxing
<dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.2.1</version> </dependency>
2.创建BufferedImageLuminanceSource类
package com.quna.app.pay; import com.google.zxing.LuminanceSource; import java.awt.Graphics2D; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; /** * @version: V1.0 * @author: fendo * @className: BufferedImageLuminanceSource * @packageName: com.xxx * @description: * @data: 2018-04-17 14:23 **/ 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); } }
3.二维码工具类
package com.quna.app.pay; import com.google.zxing.*; import com.google.zxing.common.HybridBinarizer; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.Map; /** * @version: V1.0 * @author: fendo * @className: QrCodeUtils * @packageName: com.xxx * @description: 二维码工具类 * @data: 2018-04-17 14:23 **/ public class QrCodeUtils { /** * 解析二维码(QRCode) * @param image * @return */ 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); Result result = formatReader.decode(binaryBitmap, hints);//开始解析 return result.getText(); } /** * 流图片解码 * @param input * @return String */ public static String decodeQrcode(InputStream input) throws NotFoundException, IOException { BufferedImage image = ImageIO.read(input); LuminanceSource source = new BufferedImageLuminanceSource(image); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); Map<DecodeHintType,Object> hints = new LinkedHashMap<DecodeHintType,Object>(); // 解码设置编码方式为:utf-8, hints.put(DecodeHintType.CHARACTER_SET, "UTF-8"); //优化精度 hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE); //复杂模式,开启PURE_BARCODE模式 hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE); Result result = new MultiFormatReader().decode(bitmap, hints); return result.getText(); } }
4.测试类
package com.quna.app.pay; import com.alibaba.fastjson.JSONObject; import org.junit.Test; import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.*; import java.net.HttpURLConnection; import java.net.URL; /** * @version: V1.0 * @author: fendo * @className: TestQR * @packageName: com.xxx * @description: 二维码测试类 * @data: 2018-04-17 14:23 **/ public class TestQR { public static void main(String[] args) { try { URL url = new URL("https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=你的token"); 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("path", "pages/home/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(); //buff用于存放循环读取的临时数据 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); /**裁剪原图 目前访问微信 微信返回的是 470*535 像素 170620*/ BufferedImage subImage = image.getSubimage(0, 0, image.getWidth(), (int) (image.getHeight() * 0.85)); System.out.println(QrCodeUtils.decodeQrcode(subImage)); BufferedImage inputbig = new BufferedImage(256, 256, BufferedImage.TYPE_INT_BGR); Graphics2D g = (Graphics2D) inputbig.getGraphics(); g.drawImage(subImage, 0, 0,256,256,null); //画图 g.dispose(); inputbig.flush(); ImageIO.write(inputbig, "jpg", new File("C:\\Users\\luojialin\\Desktop\\jar\\2018-4-20\\124567890.png")); } catch (Exception e) { e.printStackTrace(); } } }