二维码生成

引入qrcode.js  ，根据表单可以自动生成二维码，例如我自己得，但是暂时扫出来不能显示我的文字，只有时间

package com.example.mesproject.Controller;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import org.springframework.web.bind.annotation.*;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Map;

@RestController
@RequestMapping("/api/qrcode")
public class QRCodeController {

    // 生成二维码并返回图片
    @PostMapping("/generate")
    public ResponseEntity<byte[]> generateQRCode(@RequestBody Map<String, String> formData) throws WriterException, IOException {
        // 获取表单提交的数据
        String name = formData.get("name");
        String process = formData.get("process");
        String time = formData.get("time");
        String startTime = formData.get("startTime");
        String endTime = formData.get("endTime");

        // 拼接二维码内容
        String qrContent = "员工姓名: " + name + ", 工序: " + process + ", 工时: " + time + ", 开始时间: " + startTime + ", 结束时间: " + endTime;

        // 打印二维码内容，便于调试
        System.out.println("二维码内容: " + qrContent);

        // 生成二维码
        QRCodeWriter qrCodeWriter = new QRCodeWriter();
        BitMatrix bitMatrix = qrCodeWriter.encode(new String(qrContent.getBytes(StandardCharsets.UTF_8), StandardCharsets.UTF_8), BarcodeFormat.QR_CODE, 300, 300);

        // 将二维码转换为字节数组
        ByteArrayOutputStream pngOutputStream = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(bitMatrix, "PNG", pngOutputStream);
        byte[] pngData = pngOutputStream.toByteArray();

        // 设置返回的响应类型为图片
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.IMAGE_PNG);
        headers.setContentLength(pngData.length);

        return ResponseEntity.ok().headers(headers).body(pngData);
    }
}