Java生成二维码
使用QRCode生成二维码
jar包qrcode.jar
public class QRCodeUbil { public void encoderQRCode(String content,String imPath,String imType,int size) throws Exception{ //BufferedImage:内存中的一张图片 /** * */ BufferedImage bufImg = qRcodeCommon(content,imType,size); File file =new File(imPath); //生成图片 ImageIO.write(bufImg,imType,file); } //产生一个二维码的BufferedImage public BufferedImage qRcodeCommon(String content ,String imType,int size) throws Exception{ BufferedImage bufImg = null; //Qrcode 对象,字符串->boolean[][] Qrcode qrCodeHandler = new Qrcode(); //设置二维码的排错率;7% L<M<Q<H 30%,排错率越高,可存储的信息越少,但是二维码清晰要求越小 qrCodeHandler.setQrcodeErrorCorrect('M'); //可存放的信息类型:N:数字,A:数字加A-Z B:所有 qrCodeHandler.setQrcodeErrorCorrect('B'); //尺寸：取值范围：1-40 qrCodeHandler.setQrcodeVersion(size); byte[] contentBytes = content.getBytes(); boolean[][] codeOut = qrCodeHandler.calQrcode(contentBytes); int imgSize = 67+12*(size-1); bufImg =new BufferedImage(imgSize,imgSize,BufferedImage.TYPE_INT_RGB); //创建一个画板 Graphics2D gs = bufImg.createGraphics(); gs.setBackground(Color.WHITE); gs.clearRect(0,0,imgSize,imgSize); gs.setColor(Color.BLACK); int pixoff = 2 ; for (int j=0;j<codeOut.length;j++){ for(int i=0;i<codeOut.length;i++){ if(codeOut[j][i]){ gs.fillRect(j*3+pixoff,i*3+pixoff,3,3); } } } //添加图片 Image logo = ImageIO.read(new File("src/123.png")); int maxHeight = bufImg.getHeight(); int maxWidth = bufImg.getWidth(); gs.drawImage(logo,imgSize/5*2,imgSize/5*2,maxWidth/5,maxHeight/5,null); gs.dispose(); bufImg.flush(); return bufImg; } //解析二维码 public String decodeQRCode(String imPath) throws Exception{ BufferedImage bufImg = ImageIO.read(new File(imPath)); QRCodeDecoder decoder = new QRCodeDecoder(); TowCode tdcImage =new TowCode(bufImg); byte[] bs=decoder.decode(tdcImage); String content =new String(bs,"utf-8"); return content; } test
public class Test { public static void main(String[] args) throws Exception { String imPath ="d:/二维码/www.png"; String content = "www.baidu.com"; QRCodeUbil qrUtil = new QRCodeUbil(); //生成二维码 qrUtil.encoderQRCode(content,imPath,"png",10); //添加图片 String imgContent= qrUtil.decodeQRCode(imPath); //解析二维码 System.out.println(imgContent); } } 解析二维码有时候是字符 ，增大生成二维码的大小就好了。
文章来源: https://blog.csdn.net/weixin_43951020/article/details/92560784