小程序动态生成二维码，生成image图片

前端：

js部分：在onLoad中请求

//我的userid 值为：239a3c37-3c2e-4a9d-be74-557638b23b63
this.setData({ img_usrl: getApp().getBaseUrl() + "/icon/" + userid });

java后台：

@RequestMapping("icon/{cateogry}")

public void getQrcodeImg(@PathVariable("cateogry") String cateogry,

        HttpServletRequest request,

        HttpServletResponse response){

    try {

        //cateogry的值为前端请求的值：239a3c37-3c2e-4a9d-be74-557638b23b63

        String url = "固定写死的url路径?id参数="+cateogry;

        BufferedImage image = QRCodeUtli.getqrcode(url);

        response.setContentType("image/png");

        OutputStream stream = response.getOutputStream();

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        ImageIO.write(image, "png",     out);

        stream.write(out.toByteArray());

        stream.flush();

        stream.close();

    } catch (Exception e) {

        e.printStackTrace();

    }

}

工具QRCodeUtli类：

package com.early.api.util;

import java.awt.image.BufferedImage;

import java.util.HashMap;

import java.util.Map;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.WriterException;

import com.google.zxing.common.BitMatrix;

public class QRCodeUtli {

    private static final int BLACK = 0xFF000000;

    private static final int WHITE = 0xFFFFFFFF;

    public static BufferedImage getqrcode(String code) {

        int width = 400; // 图像宽度

        int height = 400; // 图像高度

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

        hints.put(EncodeHintType.MARGIN, 0);//设置白边宽度，取值0~4

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

        try {

            BitMatrix bitMatrix = new MultiFormatWriter().encode(code,

                    BarcodeFormat.QR_CODE, width, height, hints);

            BufferedImage image = toBufferedImage(bitMatrix);

            return image;

        } catch (WriterException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return null;

    }

    public static BufferedImage toBufferedImage(BitMatrix matrix) {

        int width = matrix.getWidth();

        int height = matrix.getHeight();

        BufferedImage image = new BufferedImage(width, height,

                BufferedImage.TYPE_INT_RGB);

        for (int x = 0; x < width; x++) {

            for (int y = 0; y < height; y++) {

                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);

            }

        }

        return image;

    }

}

pom文件需要引用的包：

<dependency>

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

    <artifactId>core</artifactId>

    <version>3.3.1</version>

</dependency>

<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>

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小程序动态生成二维码，生成image图片

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