Java实现生成二维码展示到浏览器的示例代码
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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