此方法经过测试，上传到页面与保存到本地是可以执行的
也可以对其加入logo
页面加入logo我没有进行尝试，如果需要自己可以根据需求更改工具代码
如果要加入logo，记得缩放显示logo，下面这个条件传入true
引入maven
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>工具方法
package com.dosion.core.common.utils;
import com.google.zxing.*;
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 javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
public class QRCodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
/**
* 生成二维码
* @param content 源内容
* @param imgPath 生成二维码保存的路径
* @param needCompress 是否要压缩
* @return 返回二维码图片
* @throws Exception
*/
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
Hashtable hints = new Hashtable();
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;
}
/**
* 在生成的二维码中插入图片
* @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);
//System.out.println(file+"****************************");
if (!file.exists()) {
System.err.println("" + imgPath + " 该文件不存在！");
return;
}
Image src = ImageIO.read(new File(imgPath));
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();
g.drawImage(image, 0, 0, null); // 绘制缩小后的图
g.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();
}
/**
* 生成带logo二维码，并保存到磁盘
* @param content 链接或者内容
* @param imgPath logo图片
* @param destPath 保存二维码图片的文件路径
* @param needCompress
* @throws Exception
*/
public static Boolean saveLocal(String content, String imgPath, String destPath, boolean needCompress,String random) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
if(image==null){
return false;
}
mkdirs(destPath);
String file = random + ".jpg";//生成随机文件名
ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
return true;
}
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();
}
}
/**
* 上传页面方法
* @param content
* @param imgPath
* @param output
* @param needCompress
* @throws Exception
*/
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);
}
/**
* 过滤条件
* @param content
* @param output
* @throws Exception
*/
public static void uploadToWeb(String content, OutputStream output) throws Exception {
QRCodeUtil.encode(content, null, output, false);
}
/**
* 从二维码中，解析数据
* @param file 二维码图片文件
* @return 返回从二维码中解析到的数据值
* @throws Exception
*/
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;
Hashtable hints = new Hashtable();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}
public static String decode(String path) throws Exception {
return QRCodeUtil.decode(new File(path));
}
}
在上传页面的时候OutPutStream 可以使用response.getoutPutStream()方法获取
我的页面二维码显示
<img src="${ctx}/getCord" />还有一个ImageIo.write关流问题，我不知道他需不需要，有没有，希望有哪位懂的话能留言指点一下，小弟先谢谢了
下面是output的关流，如果哪位懂的话帮忙看一下，如有问题，希望帮忙指出
try {
QRCodeUtil.uploadToWeb("https://www.baidu.com/",rep.getOutputStream());
} catch (Exception e) {
e.printStackTrace();
}finally {
rep.getOutputStream().flush();
rep.getOutputStream().close();
}查找了很多方法，感觉这个还是可以的，可以根据具体需求更改一下传参之类的，比较方便
不记得是哪位大佬分享的，希望见到莫怪