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Java实现生成二维码展示到浏览器的示例代码

 更新时间：2024年01月02日 09:43:14   作者：夜空下的星  
这篇文章主要介绍了Java实现生成二维码展示到浏览器的示例代码,要实现在浏览器展示二维码,那么首先需要html文件,通过Java生成二维码的工具类,在controller层调用接口,就可以实现在浏览器上展示二维码,需要的朋友可以参考下

要实现在浏览器展示二维码，那么首先需要html文件，通过Java生成二维码的工具类，在controller层调用接口，就可以实现在浏览器上展示二维码。

html文件内容如下：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org" xmlns:http="http://www.w3.org/1999/xhtml"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity4">
<head>
<meta charset="UTF-8">
<title>二维码</title>
<script th:src="@{../js/jquery-3.1.1.js}"></script>
<style type="text/css">
	#qrcode-mask{
		margin-left: 40px;
		margin-top: 30px;
	}
	#code-panel{
		width: 280px;
		height: 320px;
		border: 1px solid #e1e1e1;
		margin: 0 auto;
		margin-top: 30px;
		background-color: rgba(255,215,255,0.25);
		box-shadow: -4px -4px 6px rgba(0,0,0,0.35) inset;
	}
	/*rgba(25,252,205,0.15);*/
	#desc{
		color: #717375;
		font-size: 14px;
		text-align: center;
	}
</style>
 <script type="text/javascript">
    	onload=function(){
    		$.ajax({
    			type: 'POST',
    			url: '/qrcode/img',
    			dataType: 'json',
    			data: '',
    			success:function (result) {
    	        	if (result.code == 1){
    	        		$("#qrcode").attr('src','data:image/png;base64,'+result.data.img);
    	        	}else{
    	        		alert(result.info);
    	        	}
    	        },
    	        error:function (result) {
    	        	alert("获取失败");
    	        }
    	    });
    	}
 </script>
</head>
<body>
	<div id="code-panel">
		<div id="qrcode-mask">
			<img id="qrcode" alt="" src="">
		</div>
		<div id="desc">
			扫描并关注<br>
			微信公众平台
		</div>
	</div>
</body>
</html>

接着在Controller层实现一个接口，代码如下：

import java.util.HashMap;
import java.util.Map;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.suntree.commons.ApiResult;
import com.suntree.utils.QRCodeUtil;
@SpringBootApplication
@RestController
@RequestMapping("/qrcode")
public class QRCodeContoller {
	/**
	 * 获取二维码图片
	 * @return
	 */
	@PostMapping("/img")
	public ApiResult getQRCodeImage() {
		ApiResult result=new ApiResult();
		Map<String,Object> img=new HashMap<>();
		String content="https://guangz-myblog.oss-cn-shenzhen.aliyuncs.com/private/user/%E5%88%98%E5%85%89%E5%AE%97/ff52da04-009d-49b4-9601-936c33bb0673.png";
		String imgPath="https://guangz-myblog.oss-cn-shenzhen.aliyuncs.com/private/user/%E5%88%98%E5%85%89%E5%AE%97/ff52da04-009d-49b4-9601-936c33bb0673.png";
		String base64=QRCodeUtil.getImageToBase64(content, imgPath, true);
		img.put("img", base64);
		return result.success(img);
	}
}

这个获取的是二维码图片的base64；

再接下来就是实现生成二维码的工具类，代码如下：

import java.awt.BasicStroke;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import sun.misc.BASE64Encoder;
public class QRCodeUtil {
	private static final String CHARSET = "utf-8";
	private static final String FORMAT_NAME = "PNG";
	// 二维码尺寸
	private static final int QRCODE_SIZE = 200;
	// LOGO宽度
	private static final int WIDTH = 60;
	// LOGO高度
	private static final int HEIGHT = 60;
	/**
	 * 创建图片
	 * @param content
	 * @param imgPath
	 * @param needCompress
	 * @return
	 * @throws Exception
	 */
	private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
		Map<EncodeHintType,Object> hints = new HashMap<EncodeHintType, Object>();
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
		hints.put(EncodeHintType.MARGIN, 1);
		BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
				hints);
		int width = bitMatrix.getWidth();
		int height = bitMatrix.getHeight();
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
			}
		}
		if (imgPath == null || "".equals(imgPath)) {
			return image;
		}
		// 插入图片
		QRCodeUtil.insertImage(image, imgPath, needCompress);
		return image;
	}
	/**
	 * 插入图片
	 * @param source
	 * @param imgPath
	 * @param needCompress
	 * @throws Exception
	 */
	private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
		File file = new File(imgPath);
		if (!file.exists()) {
			System.err.println("" + imgPath + "   该文件不存在！");
			return;
		}
		Image src = ImageIO.read(file);
		int width = src.getWidth(null);
		int height = src.getHeight(null);
		if (needCompress) { // 压缩LOGO
			if (width > WIDTH) {
				width = WIDTH;
			}
			if (height > HEIGHT) {
				height = HEIGHT;
			}
			Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
			BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			//Graphics g = tag.getGraphics();
			Graphics2D g2 = (Graphics2D) tag.getGraphics();
			g2.drawImage(image, 0, 0, null); // 绘制缩小后的图
			g2.dispose();
			src = image;
		}
		// 插入LOGO
		Graphics2D graph = source.createGraphics();
		int x = (QRCODE_SIZE - width) / 2;
		int y = (QRCODE_SIZE - height) / 2;
		graph.drawImage(src, x, y, width, height, null);
		Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
		graph.setStroke(new BasicStroke(3f));
		graph.draw(shape);
		graph.dispose();
	}
	/**
	 * 
	 * 生成二维码并放入本地
	 * @param content
	 * @param imgPath
	 * @param destPath
	 * @param needCompress
	 * @throws Exception
	 */
	public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		mkdirs(destPath);
		ImageIO.write(image, FORMAT_NAME, new File(destPath));
	}
	public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		return image;
	}
	public static void mkdirs(String destPath) {
		File file = new File(destPath);
		// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
		if (!file.exists() && !file.isDirectory()) {
			file.mkdirs();
		}
	}
	public static void encode(String content, String imgPath, String destPath) throws Exception {
		QRCodeUtil.encode(content, imgPath, destPath, false);
	}
	public static void encode(String content, String destPath) throws Exception {
		QRCodeUtil.encode(content, null, destPath, false);
	}
	public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
			throws Exception {
		BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
		ImageIO.write(image, FORMAT_NAME, output);
	}
	public static void encode(String content, OutputStream output) throws Exception {
		QRCodeUtil.encode(content, null, output, false);
	}
	public static String decode(File file) throws Exception {
		BufferedImage image;
		image = ImageIO.read(file);
		if (image == null) {
			return null;
		}
		BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
		BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
		Result result;
		Map<DecodeHintType,Object> hints = new HashMap<DecodeHintType, Object>();
		hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
		result = new MultiFormatReader().decode(bitmap, hints);
		String resultStr = result.getText();
		return resultStr;
	}
	/**
	 * 生成二维码图片转base64
	 * 
	 * @param content
	 * @param imgPath
	 * @param needCompress
	 * @return
	 */
	public static String getImageToBase64(String content, String imgPath, boolean needCompress) {
		ByteArrayOutputStream out=null;
		try {
			BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
			out = new ByteArrayOutputStream();
			ImageIO.write(image,"png",out);
			byte[] b = out.toByteArray();
			BASE64Encoder encoder = new BASE64Encoder();
	        return encoder.encode(b);//生成base64编码 
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			if(out!=null) {
				try {
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}
}

最后实现WebMvcConfigurer接口，这样就可以在浏览器上展示二维码了。

大家可以自己去试试，望大家多多支持！

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