使用Zxing生成二维码并输出到Web

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.2.1</version>
</dependency>

package cn.licoy.controller;
 
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 org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
 
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;
 
/**
 * @author Licoy.cn
 * @version 1.0 / qrcode
 */
@Controller
public class QrController {@GetMapping("/")
    public void get(@RequestParam(name = "w",defaultValue = "200",required = false) int width,
                    @RequestParam(name = "h",defaultValue = "200",required = false) int height,
                    @RequestParam(name = "f",defaultValue = "png",required = false) String format,
                    @RequestParam(name = "c",defaultValue = "content") String content,
                    HttpServletResponse response) throws Exception {ServletOutputStream out = response.getOutputStream();
        Map<EncodeHintType,Object> config = new HashMap<>();
        config.put(EncodeHintType.CHARACTER_SET,"UTF-8");
        config.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        config.put(EncodeHintType.MARGIN, 0);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,width,height,config);
        MatrixToImageWriter.writeToStream(bitMatrix,format,out);
        System.out.println("二维码生成完毕，已经输出到页面中。");
    }
}