java 生成内嵌网络图片二维码

我是maven项目，首先在项目的pom.xml中添加依赖

[code]        <dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>2.2</version>
</dependency>

添加完jar包依赖之后，首先第一个类（谷歌提供的帮助类）

[code]package com.yc.qrcode;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import com.google.zxing.LuminanceSource;

public class BufferedImageLuminanceSource extends LuminanceSource {

private final BufferedImage image;
private final int left;
private final int top;

public BufferedImageLuminanceSource(BufferedImage image) {
this(image, 0, 0, image.getWidth(), image.getHeight());
}

public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
super(width, height);

int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
if (left + width > sourceWidth || top + height > sourceHeight) {
throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
}

for (int y = top; y < top + height; y++) {
for (int x = left; x < left + width; x++) {
if ((image.getRGB(x, y) & 0xFF000000) == 0) {
image.setRGB(x, y, 0xFFFFFFFF); // = white
}
}
}

this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image, 0, 0, null);
this.left = left;
this.top = top;
}

public byte[] getRow(int y, byte[] row) {
if (y < 0 || y >= getHeight()) {
throw new IllegalArgumentException("Requested row is outside the image: " + y);
}
int width = getWidth();
if (row == null || row.length < width) {
row = new byte[width];
}
image.getRaster().getDataElements(left, top + y, width, 1, row);
return row;
}

public byte[] getMatrix() {
int width = getWidth();
int height = getHeight();
int area = width * height;
byte[] matrix = new byte[area];
image.getRaster().getDataElements(left, top, width, height, matrix);
return matrix;
}

public boolean isCropSupported() {
return true;
}

public LuminanceSource crop(int left, int top, int width, int height) {
return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
}

public boolean isRotateSupported() {
return true;
}

public LuminanceSource rotateCounterClockwise() {
int sourceWidth = image.getWidth();
int sourceHeight = image.getHeight();
AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g = rotatedImage.createGraphics();
g.drawImage(image, transform, null);
g.dispose();
int width = getWidth();
return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
}

}

第二个类

[code]package com.yc.qrcode;

import java.awt.BasicStroke;
import java.awt.Graphics;
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.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;
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.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

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;

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;
}

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(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();
}

public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
mkdirs(destPath);
// String file = new Random().nextInt(99999999)+".jpg";
// ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
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);
}
// 被注释的方法
/*
* public static void encode(String content, String destPath, boolean
* needCompress) throws Exception { QRCodeUtil.encode(content, null, destPath,
* needCompress); }
*/

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;
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));
}

}

主类：

[code]package com.yc.qrcode;

public class QrCodeTest {

public static void main(String[] args) throws Exception {
// 存放在二维码中的内容
String text = "我是小铭";
// 嵌入二维码的图片路径
String imgPath = "D:\\test\\微信图片_20200318152441.jpg";
// 生成的二维码的路径及名称
String destPath = "D:\\test\\test2.jpg";
//生成二维码
QRCodeUtil.encode(text, imgPath, destPath, true);
// 解析二维码
String str = QRCodeUtil.decode(destPath);
// 打印出解析出的内容
System.out.println(str);

}

}

生成二维码方法：

QRCodeUtil.encode(text, imgPath, destPath, true);

text：编码到二维码中的内容，这里是“我是小铭”

imgPath：要嵌入二维码的图片路径，如果不写或者为null则生成一个没有嵌入图片的纯净的二维码

destPath：生成的二维码的存放路径

true：表示将嵌入二维码的图片进行压缩，如果为“false”则表示不压缩。

解析二维码方法：

QRCodeUtil.decode(destPath);

destPath：将要解析的二维码的存放路径

这样就出来啦~，，，但是我嵌入的图片并不是我本地的图片，而是网络图片，所以我还要把网络图片下载下来先~~这里写了个测试类仅展示效果

[code]package com.ruoyi.wanshang.controller;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import com.ruoyi.wanshang.utils.QRCodeUtil;

public class QrCodeTest {

/**
* fileUrl：网络图片的路径
* saveImagePath：要保存的地址
* @param fileUrl
* @param saveImagePath
* @return
*/
public static String uploadQianURL(String fileUrl,String saveImagePath) {
//获取文件名，文件名实际上在URL中可以找到
String fileName = "tmp.jpg";
//这里服务器上要将此图保存的路径
String savePath = saveImagePath;
try {
URL url = new URL(fileUrl);/*将网络资源地址传给,即赋值给url*/
/*此为联系获得网络资源的固定格式用法，以便后面的in变量获得url截取网络资源的输入流*/
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
DataInputStream in = new DataInputStream(connection.getInputStream());
/*此处也可用BufferedInputStream与BufferedOutputStream*/
DataOutputStream out = new DataOutputStream(new FileOutputStream(savePath+fileName));
/*将参数savePath，即将截取的图片的存储在本地地址赋值给out输出流所指定的地址*/
byte[] buffer = new byte[4096];
int count = 0;
/*将输入流以字节的形式读取并写入buffer中*/
while ((count = in.read(buffer)) > 0) {
out.write(buffer, 0, count);
}
out.close();/*后面三行为关闭输入输出流以及网络资源的固定格式*/
in.close();
connection.disconnect();
//返回内容是保存后的完整的URL
return saveImagePath+fileName;/*网络资源截取并存储本地成功返回true*/
} catch (Exception e) {
System.out.println(e + fileUrl + savePath);
return null;
}
}

/**
* 生成二维码方法
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
//网络图片路径
String fileUrl="http://thirdwx.qlogo.cn/mmopen/vi_32/pbAR8vibA1CV75SicvMD9zYic4wsnYxyDAiaNDicrAx6e1jUY6RlBXpqAZhWVesm3agWjax1UXLxJLjpe2Tyx4B5E60/132";
String saveImagePath="D:\\test\\";
//下载图片操作比较耗时，所以最好开一个单独的线程
String imgPath = uploadQianURL(fileUrl,saveImagePath);
// 存放在二维码中的内容
String text = "我是小铭";
// 生成的二维码的路径及名称
String destPath = "D:\\test\\test2.jpg";
//生成二维码
QRCodeUtil.encode(text, imgPath, destPath, true);

}

}

这样网络图片就下载到本地可以展示啦~~~