生成二维码两种方法
1、使用前端jquery.qrcode.min.js框架生成二维码 在https://github.com/jeromeetienne/jquery-qrcode上下载对应的夹包，生成二维码的JSP页面如下：<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
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1、使用前端jquery.qrcode.min.js框架生成二维码
在https://github.com/jeromeetienne/jquery-qrcode上下载对应的夹包，生成二维码的JSP页面如下：
<%@ 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>生成二维码</title>
<script type="text/javascript" src="<%=request.getContextPath()%>/js/jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/js/jquery.qrcode.min.js"></script>
<!--或者使用如下引入方式也可
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-3.2.1.min.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.qrcode.min.js"></script>
-->
</head>
<body>
<script type="text/javascript">
//将Unicode编码转为UTF-8编码
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>
<h1>生成二维码</h1>
<div id="qrcode"></div>
<script type="text/javascript">
var str = "清华大学";
var out = utf16to8(str);
//jQuery('#qrcode').qrcode(out);
jQuery('#qrcode').qrcode({
width : 300,
height : 300,
text : out
});
</script>
</html>
在GitHub上面有开源项目https://github.com/zxing/，下载到本地后解压缩，将core和javase文件夹中的所有.java文件拷贝到Java项目中，然后export为zxing.jar的夹包，作为项目的引用。
生成二位码的源码如下：
public class Genarate2DCode {
public static void main(String[] args) throws Exception {
//二维码宽度
int width=300;
//二维码高度
int height=300;
//二维码图片格式
String format="png";
//二维码内容，这里为VCard规范，可以保存个人名片信息
String contents=
"BEGIN:VCARD"+"\n"
+"VERSION:2.1"+"\n"
+"N:姓;名"+"\n"
+"FN:姓名"+"\n"
+"NICKNAME:昵称"+"\n"
+"ORG:公司;部门"+"\n"
+"TITLE:职位"+"\n"
+"TEL;WORK;VOICE:工作电话"+"\n"
+"TEL;HOME;VOICE:家庭电话"+"\n"
+"TEL;CELL;VOICE:移动电话"+"\n"
+"ROLE:职称"+"\n"
+"ADR;WORK:门牌号;街道;福田;深圳;广东;30314;国家"+"\n"
+"ADR;HOME:门牌号;街道;盐田;深圳;广东;30314;国家"+"\n"
+"EMAIL;PREF;INTERNET:邮箱地址"+"\n"
+"URL:https://www.baidu.com"+"\n"
+"BDAY:出生日期"+"\n"
+"PHOTO;VALUE=uri:https://timgsa.baidu.com/timg?xxxx"+"\n"
+"REV:20080424T195243Z"+"\n"
+"END:VCARD";
//定义二维码参数的哈希映射表
HashMap<EncodeHintType,Object> hints=new HashMap<EncodeHintType,Object>();
//编码方式，支持中文
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
//容错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
//二维码边距
hints.put(EncodeHintType.MARGIN, 1);
//生成点阵
BitMatrix bitMatrix=new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height,hints);
Path file=new File("E:/Img.png").toPath();
MatrixToImageWriter.writeToPath(bitMatrix, format, file);
}
}
二维码扫描结果为：
识别二维码的源码如下：
public class ReadQRCode {
public static void main(String[] args) throws Exception {
MultiFormatReader multiFormatReader = new MultiFormatReader();
File file = new File("E:/Img.png");
BufferedImage image = ImageIO.read(file);
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
// 定义二维码参数的哈希映射表
HashMap<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
// 编码方式，支持中文
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
//输出识别结果
Result result = multiFormatReader.decode(binaryBitmap, hints);
System.out.println(result);
}
}
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