pom:
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.3</version>
</dependency>
1)生成文字二维码
java工具类:
package com.ruoyi.common.utils.file;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.utils.StringUtils;
import lombok.extern.slf4j.Slf4j;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
/**
* 文字生成二维码
*/
@Slf4j
public class GenerateQrCodeFile {
/**
* 黑
*/
private static final int BLACK = 0xFF000000;
/**
* 白
*/
private static final int WHITE = 0xFFFFFFFF;
/**
* 高
*/
private static final int HIGTH = 300;
/**
* 宽
*/
private static final int WIDTH = 300;
/**
* 文件后缀
*/
private static final String FORMAT = "jpg";
private static final String DOT = ".";
/**
* 字符串生成二维码方法
*
* @param content 字符串
* @return 二维码
*/
public static File buildQuickMark(String content, String filePath) {
File file = new File(filePath + File.separator + content + DOT + FORMAT);
try {
if (!file.exists()) {
file.mkdirs();
}
BitMatrix byteMatrix = new MultiFormatWriter().encode(new String(content.getBytes(), StandardCharsets.ISO_8859_1),
BarcodeFormat.QR_CODE, WIDTH, HIGTH);
BufferedImage image = toBufferedImage(byteMatrix);
if (!ImageIO.write(image, FORMAT, file)) {
throw new IOException("生成二维码异常" + file);
}
return file;
} catch (Exception e) {
log.error("生成二维码异常", e);
throw new ServiceException("生成二维码异常");
}
}
private static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);
}
}
return image;
}
/**
* 上传二维码
*
* @param content 二维码内容
* @param path 路径
*/
public static String uploadImage(String content, String path) {
if (StringUtils.isBlank(content) || StringUtils.isBlank(path)) {
throw new ServiceException("新增二维码图片异常!");
}
try {
// 生成二维码图片
GenerateQrCodeFile.buildQuickMark(content, path);
return content + DOT + FORMAT;
} catch (Exception e) {
throw new ServiceException("新增二维码图片异常!");
}
}
}
2)url地址生成二维码
java工具类:
package com.ruoyi.common.utils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.imageio.ImageIO;
import javax.swing.filechooser.FileSystemView;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
/**
* 二维码工具
**/
public class QRCodeUtil {
private static final Logger log= LoggerFactory.getLogger(QRCodeUtil.class);
//CODE_WIDTH:二维码宽度,单位像素
private static final int CODE_WIDTH = 400;
//CODE_HEIGHT:二维码高度,单位像素
private static final int CODE_HEIGHT = 400;
//FRONT_COLOR:二维码前景色,0x000000 表示黑色
private static final int FRONT_COLOR = 0x000000;
//BACKGROUND_COLOR:二维码背景色,0xFFFFFF 表示白色
//演示用 16 进制表示,和前端页面 css 的取色是一样的,注意前后景颜色应该对比明显,如常见的黑白
private static final int BACKGROUND_COLOR = 0xFFFFFF;
/**
* 生成二维码
*
* @param content 二维码跳转地址
* @param codeImgFileSaveDir 放存储路径的File类
* @param fileName 二维码图片名称(包含后缀)
*/
public static void createCodeToFile(String content, File codeImgFileSaveDir, String fileName) {
try {
if (StringUtils.isBlank(content) || StringUtils.isBlank(fileName)) {
return;
}
content = content.trim();
if (codeImgFileSaveDir==null || codeImgFileSaveDir.isFile()) {
//二维码图片存在目录为空,默认放在桌面...
codeImgFileSaveDir = FileSystemView.getFileSystemView().getHomeDirectory();
}
if (!codeImgFileSaveDir.exists()) {
//二维码图片存在目录不存在,开始创建...
codeImgFileSaveDir.mkdirs();
}
//核心代码-生成二维码
BufferedImage bufferedImage = getBufferedImage(content);
File codeImgFile = new File(codeImgFileSaveDir, fileName);
ImageIO.write(bufferedImage, "png", codeImgFile);
log.info("二维码图片生成成功:" + codeImgFile.getPath());
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码并输出到输出流, 通常用于输出到网页上进行显示,输出到网页与输出到磁盘上的文件中,区别在于最后一句 ImageIO.write
* write(RenderedImage im,String formatName,File output):写到文件中
* write(RenderedImage im,String formatName,OutputStream output):输出到输出流中
* @param content :二维码内容
* @param outputStream :输出流,比如 HttpServletResponse 的 getOutputStream
*/
public static void createCodeToOutputStream(String content, OutputStream outputStream) {
try {
if (StringUtils.isBlank(content)) {
return;
}
content = content.trim();
//核心代码-生成二维码
BufferedImage bufferedImage = getBufferedImage(content);
//区别就是这一句,输出到输出流中,如果第三个参数是 File,则输出到文件中
ImageIO.write(bufferedImage, "png", outputStream);
log.info("二维码图片生成到输出流成功...");
} catch (Exception e) {
e.printStackTrace();
}
}
//核心代码-生成二维码
private static BufferedImage getBufferedImage(String content) throws WriterException {
//com.google.zxing.EncodeHintType:编码提示类型,枚举类型
Map<EncodeHintType, Object> hints = new HashMap();
//EncodeHintType.CHARACTER_SET:设置字符编码类型
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
//EncodeHintType.ERROR_CORRECTION:设置误差校正
//ErrorCorrectionLevel:误差校正等级,L = ~7% correction、M = ~15% correction、Q = ~25% correction、H = ~30% correction
//不设置时,默认为 L 等级,等级不一样,生成的图案不同,但扫描的结果是一样的
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
//EncodeHintType.MARGIN:设置二维码边距,单位像素,值越小,二维码距离四周越近
hints.put(EncodeHintType.MARGIN, 1);
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, CODE_WIDTH, CODE_HEIGHT, hints);
BufferedImage bufferedImage = new BufferedImage(CODE_WIDTH, CODE_HEIGHT, BufferedImage.TYPE_INT_BGR);
for (int x = 0; x < CODE_WIDTH; x++) {
for (int y = 0; y < CODE_HEIGHT; y++) {
bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? FRONT_COLOR : BACKGROUND_COLOR);
}
}
return bufferedImage;
}
}