二维码工具类

hutool工具类

<!--hutool工具类-->
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.7.7</version>
</dependency>

import cn.hutool.extra.qrcode.QrCodeUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.util.Map;

@Slf4j
@Controller
@RequestMapping("api/xcx/")
public class WxControllerApI extends BaseController {

    //预支付接口（生成二维码并输出到浏览器）
    @GetMapping("codePay" )
    @ResponseBody
    private void codePay(HttpServletRequest request, HttpServletResponse response) throws Exception {
        
        String codeUrl = "https://blog.share888.top/";

        //生成二维码到输出流
        response.setContentType("image/jpeg");
        ServletOutputStream out = response.getOutputStream();
        QrCodeUtil.generate(codeUrl, 300, 300,"jpg" ,out);
        out.close();
    }
}

谷歌zxing

 <!-- google二维码生成包 -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>2.0</version>
</dependency>

java

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 lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;


@RestController
@RequestMapping("/test")
@Slf4j
public class TestController {

    @GetMapping("qr")
    public void saveOrder(HttpServletRequest request, HttpServletResponse response) throws Exception {
        String codeUrl = "https://blog.share888.top/";
        try{
            //生成二维码配置
            Map<EncodeHintType,Object> hints =  new HashMap<>();
            //设置纠错等级
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
            //编码类型
            hints.put(EncodeHintType.CHARACTER_SET,"UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(codeUrl, BarcodeFormat.QR_CODE,400,400,hints);
            OutputStream out =  response.getOutputStream();
            MatrixToImageWriter.writeToStream(bitMatrix,"png",out);
        }catch (Exception e){
            e.printStackTrace();
        }
    }

}