我们不造轮子，只是轮子的搬运工。（其实最好是造轮子，造比别人好的轮子）
1、 在pom.xml中加入依赖
<!--二维码-->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
2、添加工具类
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
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.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;
/**
* 二维码生成工具类
*
* @author user
* @date 2018/12/5
*/
public class QrCodeUtils {
private static final String CHARSET = "utf-8";
public static final String FORMAT = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int LOGO_WIDTH = 60;
// LOGO高度
private static final int LOGO_HEIGHT = 60;
/**
* 生成二维码
*
* @param content 二维码内容
* @param logoPath logo地址
* @param needCompress 是否压缩logo
* @return 图片
* @throws Exception
*/
public static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<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 (logoPath == null || "".equals(logoPath)) {
return image;
}
// 插入图片
QrCodeUtils.insertImage(image, logoPath, needCompress);
return image;
}
/**
* 插入LOGO
*
* @param source 二维码图片
* @param logoPath LOGO图片地址
* @param needCompress 是否压缩
* @throws IOException
*/
private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws IOException {
InputStream inputStream = null;
try {
inputStream = FileUtils.getResourceAsStream(logoPath);
Image src = ImageIO.read(inputStream);
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > LOGO_WIDTH) {
width = LOGO_WIDTH;
}
if (height > LOGO_HEIGHT) {
height = LOGO_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();
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
if (inputStream != null) {
inputStream.close();
}
}
}
/**
* 生成二维码(内嵌LOGO)
* 二维码文件名随机，文件名可能会有重复
*
* @param content 内容
* @param logoPath LOGO地址
* @param destPath 存放目录
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {
BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
mkdirs(destPath);
String fileName = new Random().nextInt(99999999) + "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
return fileName;
}
/**
* 生成二维码(内嵌LOGO)
* 调用者指定二维码文件名
*
* @param content 内容
* @param logoPath LOGO地址
* @param destPath 存放目录
* @param fileName 二维码文件名
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
mkdirs(destPath);
fileName = fileName.substring(0, fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length())
+ "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
return fileName;
}
/**
* 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)
*
* @param destPath 存放目录
*/
public static void mkdirs(String destPath) {
File file = new File(destPath);
if (!file.exists() && !file.isDirectory()) {
file.mkdirs();
}
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param logoPath LOGO地址
* @param destPath 存储地址
* @throws Exception
*/
public static String encode(String content, String logoPath, String destPath) throws Exception {
return QrCodeUtils.encode(content, logoPath, destPath, false);
}
/**
* 生成二维码
*
* @param content 内容
* @param destPath 存储地址
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static String encode(String content, String destPath, boolean needCompress) throws Exception {
return QrCodeUtils.encode(content, null, destPath, needCompress);
}
/**
* 生成二维码
*
* @param content 内容
* @param destPath 存储地址
* @throws Exception
*/
public static String encode(String content, String destPath) throws Exception {
return QrCodeUtils.encode(content, null, destPath, false);
}
/**
* 生成二维码(内嵌LOGO)
*
* @param content 内容
* @param logoPath LOGO地址
* @param output 输出流
* @param needCompress 是否压缩LOGO
* @throws Exception
*/
public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)
throws Exception {
BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
ImageIO.write(image, FORMAT, output);
}
/**
* 生成二维码
*
* @param content 内容
* @param output 输出流
* @throws Exception
*/
public static void encode(String content, OutputStream output) throws Exception {
QrCodeUtils.encode(content, null, output, false);
}
}
应各位要求，这里把FileUtils也贴出来一下：
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
public class FileUtils {
/**
* 得到图片字节流 数组大小
*/
public static byte[] readStream(InputStream inStream) throws Exception {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = -1;
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
outStream.close();
inStream.close();
return outStream.toByteArray();
}
/**
* 将文件转换成Byte数组
*
* @param file
* @return
*/
public static byte[] getBytesByFile(File file) {
try {
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
fis.close();
byte[] data = bos.toByteArray();
bos.close();
return data;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* MultipartFile转File
*
* @param param
* @return
*/
public static File transfer(MultipartFile param) {
if (!param.isEmpty()) {
File file = null;
try {
InputStream in = param.getInputStream();
file = new File(param.getOriginalFilename());
OutputStream out = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = in.read(buffer, 0, 8192)) != -1) {
out.write(buffer, 0, bytesRead);
}
in.close();
out.close();
return file;
} catch (Exception e) {
e.printStackTrace();
return file;
}
}
return null;
}
/**
* 获取指定文件的输入流
*
* @param logoPath 文件的路径
* @return
*/
public static InputStream getResourceAsStream(String logoPath) {
return FileUtils.class.getResourceAsStream(logoPath);
}
/**
* 将InputStream写入到File中
*
* @param ins
* @param file
* @throws IOException
*/
public void inputstreamtofile(InputStream ins, File file) throws IOException {
OutputStream os = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
ins.close();
}
}
3、使用
编写一个控制器
/**
* 二维码
* @param request
* @param response
*/
@RequestMapping("/qrcode")
public void qrcode( HttpServletRequest request, HttpServletResponse response) {
StringBuffer url = request.getRequestURL();
// 域名
String tempContextUrl = url.delete(url.length() - request.getRequestURI().length(), url.length()).append("/").toString();
// 再加上请求链接
String requestUrl = tempContextUrl + "/index";
try {
OutputStream os = response.getOutputStream();
QrCodeUtils.encode(requestUrl, "/static/images/logo.png", os, true);
} catch (Exception e) {
e.printStackTrace();
}
}
4、测试
访问二维码的请求链接，就可以生成一张漂亮的二维码了。
5、示例
我想说的是，有些人看着代码连抄都不会的，我也是没办法了，贴上一个例子吧。
示例
