一、引入依赖
XML
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.4.1</version>
</dependency>二、按照字符串生成二维码
java
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
public class QRCodeGeneratorByString {
public static void main(String[] args) {
String filePath = "D:\\QRcode/qrcode";
int width = 300;
int height = 300;
try {
Map<EncodeHintType, Object> hintMap = new HashMap<>();
hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hintMap.put(EncodeHintType.MARGIN, 1);
hintMap.put(EncodeHintType.ERROR_CORRECTION, com.google.zxing.qrcode.decoder.ErrorCorrectionLevel.L);
// 设置背景色和前景色
Color backgroundColor = Color.WHITE;
Color foregroundColor = Color.BLACK;
for (int i = 10; i <= 19; i++) {
// 生成类似 Fboard001 的字符串
String content = "Fboard" + String.format("%03d", i);
String fileFullPath = filePath + i + ".png";
BitMatrix matrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hintMap);
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
int color = matrix.get(x, y) ? foregroundColor.getRGB() : backgroundColor.getRGB();
image.setRGB(x, y, color);
}
}
File qrCodeFile = new File(fileFullPath);
ImageIO.write(image, "png", qrCodeFile);
System.out.println("QR Code for " + content + " generated successfully!");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
三、按照Json文件生成二维码
方法一（将json字符串直接传入）
java
public class QRCodeGeneratorByOne {
public static void main(String[] args) {
String json = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}";
String filePath = "D:\\QRcode/qrcode.png";
int width = 300;
int height = 300;
try {
Map<EncodeHintType, Object> hintMap = new HashMap<>();
hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hintMap.put(EncodeHintType.MARGIN, 1);
hintMap.put(EncodeHintType.ERROR_CORRECTION, com.google.zxing.qrcode.decoder.ErrorCorrectionLevel.L);
// 设置背景色和前景色
Color backgroundColor = Color.WHITE;
Color foregroundColor = Color.BLACK;
BitMatrix matrix = new MultiFormatWriter().encode(json, BarcodeFormat.QR_CODE, width, height, hintMap);
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
int color = matrix.get(x, y) ? foregroundColor.getRGB() : backgroundColor.getRGB();
image.setRGB(x, y, color);
}
}
File qrCodeFile = new File(filePath);
ImageIO.write(image, "png", qrCodeFile);
System.out.println("QR Code generated successfully!");
} catch (Exception e) {
e.printStackTrace();
}
}
}
方法二（将json文件导入方法）
如果，希望二维码中包含更多的信息，使用字符串已经无法满足的情况下，可以尝试使用json文件先根据 json文件，创建对应的对象：
java
@Data
@Getter
@Setter
public class JsonData {
private String name;
private int age;
private String city;
}
java
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
public class QRCodeGenerator {
public static void main(String[] args) {
String jsonFilePath = "D:\\QRcode/file.json";
generateQRCodeFromJsonFile(jsonFilePath);
}
public static void generateQRCodeFromJsonFile(String jsonFilePath) {
try {
// 读取JSON文件
File file = new File(jsonFilePath);
ObjectMapper objectMapper = new ObjectMapper();
JsonData[] jsonDataArray = objectMapper.readValue(file, JsonData[].class);
// 逐个解析JSON并生成二维码
for (JsonData jsonData : jsonDataArray) {
String jsonString = objectMapper.writeValueAsString(jsonData);
// 生成二维码图片
String qrCodeImagePath = generateQRCodeImage(jsonString);
System.out.println("Generated QR Code for JSON: " + jsonString);
System.out.println("QR Code image path: " + qrCodeImagePath);
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static String generateQRCodeImage(String data) {
int width = 300;
int height = 300;
String format = "png";
Map<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
//加上三位随机数
Random random = new Random();
int end3 = random.nextInt(999);
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(data, BarcodeFormat.QR_CODE, width, height, hints);
File qrCodeFile = new File("D:\\QRcode/qrcode"+end3+".png");
MatrixToImageWriter.writeToFile(bitMatrix, format, qrCodeFile);
return qrCodeFile.getAbsolutePath();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}注意：
此处要求的文件格式是json数组，而不是json对象
