首先在pom文件中导入有关依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.0</version> </dependency>
工具类
public class YmtUtil {
public static byte[] getQRCodeImage(String text, int width, int height) throws
WriterException, IOException {
QRCodeWriter qrCodeWriter = new QRCodeWriter();
BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width,
height);
ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, "PNG", pngOutputStream);
byte[] pngData = pngOutputStream.toByteArray();
return pngData;
}
功能实现
此处是写在service中的代码，调用过后就可以在指定的存储位置中找到对应的二维码
//获取要赋值给二维码的链接后缀如 192.168.0.21/erweima
String url = erweima;
//获取本机ip地址，也可以找一指定ip地址写死
InetAddress localhost = StrUtil.getLocalHostExactAddress();
//设置二维码访问路径
String URL= "http://localhost"+ url;
//设置二维码流
qrcode = YmtUtil.getQRCodeImage(URL, 360, 360);
final HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_PNG);
//设置生成的二维码存储地址 linux路径：（/root/D:/opt/upFiles） window路径（D:/opt/upFiles）此处使用的是linux路径
File path = new File("/root/D:/opt/upFiles", 二维码名称 + ".jpg");
//将二进制数组转为文件
ByteArrayInputStream inputStream = new ByteArrayInputStream(qrcode);
MockMultipartFile file = new MockMultipartFile(ContentType.APPLICATION_OCTET_STREAM.toString(), inputStream);
file.transferTo(path);
