java生成二维码图片

时间：2023-03-09 00:42:15
java生成二维码图片

1、POM文件引入

        <dependency>

            <groupId>com.google.zxing</groupId>

            <artifactId>core</artifactId>

            <version>3.2.0</version>

        </dependency>

        <dependency>

            <groupId>com.google.zxing</groupId>

            <artifactId>javase</artifactId>

            <version>3.2.0</version>

        </dependency>

2、java代码编写，servlet或spring mvc 的Controller

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.WriterException;

import com.google.zxing.client.j2se.MatrixToImageWriter;

import com.google.zxing.common.BitMatrix;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.net.URLEncoder;

import java.util.HashMap;

import java.util.Map;

/**

 * Created by user1 on 2015/8/12.

 */

@Controller

@RequestMapping(value = "/qrcode", produces = "application/json; charset=UTF-8")

public class QRCodeController {

    private static Logger logger = LoggerFactory.getLogger(QRCodeController.class);

    /**

     * 生成验证码图片

     * @param response

     * @throws java.io.IOException

     */

    @RequestMapping(value = "/qrcode", produces = "image/png")

    public void createQRCode(

            @RequestParam(value = "type")String type,

            HttpServletRequest request, HttpServletResponse response) throws IOException {

        //生成需要分享的二维码,也可以根据此参数生成其他的二维码，只要增加更多else if

        if ("test".equalsIgnoreCase(type)){

            //生成二维码图片的内容

            String qrCodeContent = "http://www.coolpeng.cn";

            //生成二维码图片

            encodeQRCode(response, qrCodeContent);

            logger.debug("qrCodeContent  {}", qrCodeContent);

        }

    }

    /**

     * 生成二维码图片并作为输出流输出到页面上

     * @param resp

     * @param content

     * @throws IOException

     */

    private void encodeQRCode(HttpServletResponse resp,String content) throws IOException {

        ServletOutputStream out = resp.getOutputStream();

        Map<EncodeHintType, Object> hints = new HashMap<>();

        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

        try {

            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300, hints);

            //里面自己会把流close的

            MatrixToImageWriter.writeToStream(bitMatrix, "png", out);

        } catch (WriterException | IOException e ) {

            logger.error("",e);

        }

    }

}

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