java生成二维码的三种方式zxing、qrcode以及jqueryqrcode

最新推荐文章于 2024-09-27 08:00:00 发布

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最新推荐文章于 2024-09-27 08:00:00 发布

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分类专栏： java jsp 文章标签： java 二维码 zxing qrcode jqueryqrcode

本文链接：https://blog.youkuaiyun.com/qq_31957747/article/details/54604598

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用程序玩玩生成二维码也是挺有意思的，跟大家们分享下java生成二维码的三种方式(生成二维码所需要的jar包我已经传上去了:http://download.youkuaiyun.com/detail/qq_31957747/9740909):

1、用zxing生成二维码

zxing生成二维码的java文件:

CreateQRCode.java

package com.imooc.zxing;

import java.io.File;
import java.nio.file.Path;
import java.util.HashMap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

//生成二维码
public class CreateQRCode {

	public static void main(String[] args) {
		
		int width = 300;
		int height = 300;
		String format = "png";
		String content = "www.baidu.com";
		
		//定义二维码的参数
		HashMap hints = new HashMap();
		hints.put(EncodeHintType.CHARACTER_SET,"utf-8");
		//纠错等级
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
		hints.put(EncodeHintType.MARGIN, 2);
		
		//生成二维码
		try {
			BitMatrix bitMatrix =new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height,hints);
			Path file = new File("D:/code/xx.png").toPath();
			MatrixToImageWriter.writeToPath(bitMatrix, format, file);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

zxing解析二维码的java文件:

ReadQRCode.java

package com.imooc.zxing;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;

import javax.imageio.ImageIO;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

public class ReadQRCode {
	public static void main(String []args){
		
		try {
			MultiFormatReader formatReader = new MultiFormatReader();
			
			File file = new File("D:/code/zxing.png");
			
			BufferedImage image = ImageIO.read(file);
			
			BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
			
			//定义二维码的参数
			HashMap hints = new HashMap();
			hints.put(EncodeHintType.CHARACTER_SET,"utf-8");
			
			Result result = formatReader.decode(binaryBitmap,hints);
			
			System.out.println("解析结果:"+result.toString());
			System.out.println("二维码格式类型:"+result.getBarcodeFormat());
			System.out.println("二维码文本内容:"+result.getText());
		} catch (NotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

2、用qrcode生成二维码

qrcode生成二维码的java文件:

CreateQRCode.java

package com.imooc.qrcode;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

public class CreateQRCode {

	public static void main(String[] args) throws Exception {
		
		Qrcode x = new Qrcode();
		x.setQrcodeErrorCorrect('M'); //纠错等级
		x.setQrcodeEncodeMode('B');	  //N代表数字，A代表a-Z，B代表其他字符
		x.setQrcodeVersion(7);		  //版本
		String qrData = "www.baidu.com";
		int width = 67+12*(7-1);
		int height = 67+12*(7-1);
		
		BufferedImage bufferedImage = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
		
		Graphics2D gs = bufferedImage.createGraphics();
		
		gs.setBackground(Color.WHITE);
		gs.setColor(Color.BLACK);
		gs.clearRect(0, 0, width, height);
		
		int pixoff = 2;//偏移量
		
		byte []d = qrData.getBytes("GB2312");
		if(d.length>0 && d.length<120){
			boolean [][]s = x.calQrcode(d);
			
			for(int i=0;i<s.length;i++){
				for(int j=0;j<s.length;j++){
					if(s[i][j]){
						gs.fillRect(i*3+pixoff,j*3+pixoff,3,3);
					}
				}
			}
			gs.dispose();
			bufferedImage.flush();
			
			ImageIO.write(bufferedImage, "png", new File("D:/code/qrcode.png"));
		}
		
	}

}

qrcode解析二维码的java文件:

ReadQRCode.java

package com.imooc.qrcode;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;

public class ReadQRCode {

	public static void main(String[] args) throws Exception {
		File file = new File("D:/code/qrcode.png");
		
		BufferedImage bufferedImage = ImageIO.read(file);
		
		QRCodeDecoder codeDecoder = new QRCodeDecoder();
		
		String result = new String(codeDecoder.decode(new MYQRCodeImage(bufferedImage)),"utf8");
		
		System.out.println(result);
	}

}

qrcode解析二维码中用到的实现接口类

MYQRCodeImage.java

package com.imooc.qrcode;

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

public class MYQRCodeImage implements QRCodeImage {
	
	BufferedImage bufferedImage;
	
	public MYQRCodeImage(BufferedImage bufferedImage){
		this.bufferedImage = bufferedImage;
	}
	
	@Override
	public int getHeight() {
		return bufferedImage.getHeight();
	}

	@Override
	public int getPixel(int arg0, int arg1) {
		return bufferedImage.getRGB(arg0,arg1);
	}

	@Override
	public int getWidth() {
		return bufferedImage.getWidth();
	}

}

3、jqueryqrcode生成二维码

jqueryqrcode生成二维码的jsp文件:

qrcode.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>jqueryqrcode生成二维码</title>

<script type="text/javascript" src="<%=request.getContextPath() %>/js/jquery.min.js"></script>
<script type="text/javascript" src="<%=request.getContextPath() %>/js/jquery.qrcode.min.js"></script>
</head>
<body>
生成的二维码如下:<br/>
<div id="qrcode"></div>

<script type="text/javascript">
	//jQuery("#qrcode").qrcode("www.baidu.com");
	jQuery("#qrcode").qrcode({width:200,height:200,correctLevel:0,text:utf16to8("www.baidu.com")});
	
	function utf16to8(str) {  
	    var out, i, len, c;  
	    out = "";  
	    len = str.length;  
	    for(i = 0; i < len; i++) {  
	    c = str.charCodeAt(i);  
	    if ((c >= 0x0001) && (c <= 0x007F)) {  
	        out += str.charAt(i);  
	    } else if (c > 0x07FF) {  
	        out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));  
	        out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));  
	        out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));  
	    } else {  
	        out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));  
	        out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));  
	    }  
    }  
    return out;  
}  
</script>
</body>
</html>

注意:

1、jqueryqrcode可以使用上面那种注释的，也可以用下面那种设置多个属性

各属性的含义:

text : "https://github.com/jeromeetienne/jquery-qrcode" //设置二维码内容

render : "canvas",//设置渲染方式

width : 256, //设置宽度

height : 256, //设置高度

typeNumber : -1, //计算模式

correctLevel : QRErrorCorrectLevel.H,//纠错等级

background : "#ffffff",//背景颜色

foreground : "#000000" //前景颜色

2、由于jquery-qrcode这个库是采用 charCodeAt() 这个方式进行编码转换的，而这个方法默认会获取它的 Unicode 编码，一般的解码器都是采用UTF-8, ISO-8859-1等方式，英文是没有问题，如果是中文，一般情况下Unicode是UTF-16实现，长度2位，而UTF-8编码是3位，这样二维码的编解码就不匹配了。中文就会乱码，所以用一个utf16to8对其进行处理。