java实现后台直接生成二维码图片并直接上传到七牛云上面

java实现后台直接生成二维码图片并直接上传到七牛云上面

需求：后台是直接根据唯一核销码生成图片，然后的话直接上传到七牛云，数据库只是保存地址，一开始也想错了，想成了创建临时文件存储生成的图片再上传到七牛云，后面的话想到了使用流的方式上传，所以就写成了下面的这种形式。

1.先引入maven

 <!--二维码生成-->
        <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>
        <!--七牛云-->
        <dependency>
            <groupId>com.qiniu</groupId>
            <artifactId>qiniu-java-sdk</artifactId>
            <version>7.2.9</version>
        </dependency>

2.这边的话我是写成了一个工具类，直接调用的方式，具体的就是创建二维码里面连接着上传七牛云的方法，代码里面也有相对应的注解：

package org.tule20.moduls.v1.publicApi.utils;

import cn.hutool.core.lang.UUID;
import com.google.gson.Gson;
import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.qiniu.common.QiniuException;
import com.qiniu.common.Zone;
import com.qiniu.http.Response;
import com.qiniu.storage.Configuration;
import com.qiniu.storage.UploadManager;
import com.qiniu.storage.model.DefaultPutRet;
import com.qiniu.util.Auth;

import javax.imageio.ImageIO;

import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;

/**
 * @Description:
 * @Author Gin
 * @Date 2021/4/23 14:16
 * @Version 1.0
 */
public class InvitationImgUtil {

    //二维码颜色
    private static final int BLACK = 0xFF000000;
    //二维码颜色
    private static final int WHITE = 0xFFFFFFFF;

    /*二维码生成*/
    public static Map<String,Object> zxingCodeCreate(String text, int width, int height){
        Map<EncodeHintType, String> his = new HashMap<EncodeHintType, String>();
        //设置编码字符集
        his.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            //1、生成二维码
            BitMatrix encode = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, his);
            //2、获取二维码宽高
            int codeWidth = encode.getWidth();
            int codeHeight = encode.getHeight();
            //3、将二维码放入缓冲流
            BufferedImage image = new BufferedImage(codeWidth, codeHeight, BufferedImage.TYPE_INT_RGB);
            for (int i = 0; i < codeWidth; i++) {
                for (int j = 0; j < codeHeight; j++) {
                    //4、循环将二维码内容定入图片
                    image.setRGB(i, j, encode.get(i, j) ? BLACK : WHITE);
                }
            }
            // 创建一个输出流
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            //将图片写出到指定位置（复制图片）
            ImageIO.write(image, "jpg", os);
            InputStream is = new ByteArrayInputStream(os.toByteArray());
            // 定义一个 Map 集合 存放返回值
            Map<String,Object> retMap = upload(is);//调用下面的上传七牛云接口
            return retMap;
        } catch (WriterException e) {
            e.printStackTrace();
            System.out.println("二维码生成失败");
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("生成二维码图片失败");
        }
        return null;
    }

    /** 二维码解析
     * @param analyzePath    二维码路径
     * @return
     * @throws IOException
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static String zxingCodeAnalyze(String analyzePath) throws Exception{
        MultiFormatReader formatReader = new MultiFormatReader();
        String resultStr = null;
        try {
            File file = new File(analyzePath);
            if (!file.exists())
            {
                return "二维码不存在";
            }
            BufferedImage image = ImageIO.read(file);
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map hints = new HashMap();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            Result result = formatReader.decode(binaryBitmap, hints);
            resultStr = result.getText();
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
        System.out.println(resultStr);
        return resultStr;
    }

    /*七牛云上传*/

    public static Map<String, Object> upload (InputStream stream){
        Map<String, Object> retMap = new HashMap<String, Object>();
        // 构造一个带指定Zone对象的配置类
        Configuration cfg = new Configuration(Zone.zone2()); //注意是什么地区要选好，不然会上传失败
        // 其他参数参考类注释
        UploadManager uploadManager = new UploadManager(cfg);
        // 上传凭证
        String accessKey ="*********************************";//七牛存储AccessKey
        String secretKey ="*******************************************";//七牛存储secretKey
        String bucket = "*******";//七牛存储bucket
        String resourceHost="*********************";//(七牛)资源访问域名
        // 默认不指定key的情况下，以文件内容的hash值作为文件名
        String key = UUID.randomUUID().toString().replaceAll("\\-", "");
        try {
            Auth auth = Auth.create(accessKey, secretKey);
            String upToken = auth.uploadToken(bucket);
            try {
                Response response = uploadManager.put(stream, key, upToken, null, null);
                // 解析上传成功的结果
                DefaultPutRet putRet = new Gson().fromJson(response.bodyString(), DefaultPutRet.class);
                /*retMap.put("url", "上传的连接" + putRet.key)*/;
                retMap.put("hash", putRet.hash);
                retMap.put("filePath","http://"+resourceHost+"/"+putRet.key);
            } catch (QiniuException ex) {
                Response r = ex.response;
                System.err.println(r.toString());
                try {
                    System.err.println(r.bodyString());
                } catch (QiniuException ex2) {
                    ex2.printStackTrace();
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return retMap;
    }

}

3.测试的代码:

 String test = "卫庄";
       Integer width = 200;
       Integer height = 200;
       Map<String, Object> map = InvitationImgUtil.zxingCodeCreate(test, width, height);
       Object filePath = map.get("filePath");
       System.out.println(filePath);

4.工作中总结的，请大神勿喷