java生成二维码代码

code

import com.alibaba.fastjson.JSONObject;
import com.google.zxing.*;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.util.HashMap;
import java.util.Map;

public class QRCodeGenerator {

    @Test
    public void generateQRCode() throws WriterException, IOException {
        //1、准备内容字符串
        //定义一个json对象
        JSONObject jsonObject = new JSONObject();
        //往json对象里寸数据
        jsonObject.put("name","张三丰");
        jsonObject.put("age","24");
        jsonObject.put("weight","70kg");
        //将json对象转化成字符串
        String content = jsonObject.toJSONString();
        System.out.println(content);

        //2、创建一个二维码矩阵对象
        int width = 200;
        int height = 200;

        Map<EncodeHintType, Object> hintTypeObjectMap = new HashMap<EncodeHintType, Object>();
        hintTypeObjectMap.put(EncodeHintType.CHARACTER_SET,"UTF-8");

        //3、将内容放进矩阵对象
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hintTypeObjectMap);

        //4、将矩阵对象生成图片
        MatrixToImageWriter.writeToPath(bitMatrix,"jpg", FileSystems.getDefault().getPath("D://","QRCode.jpg"));
        System.out.println("Success");
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>QRcode</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>7</source>
                    <target>7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.4.0</version>
        </dependency>

        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.4.0</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.68</version>
        </dependency>
    </dependencies>
</project>