先说一下我的配置

centos 7.0
jdk 1.7
apache tomcat 7.0
spring mvc 4.0

做微信扫码支付遇到一个很严重的问题

二维码在本地可以正常的在jsp上显示，部署到服务器上，展示出来的却是二进制文件

我的思路是这样的

我刚开始觉得是二维码图片生成有问题，随后我放弃了生成二维码，随便选择了一个JPG传到前端显示，结
果还是显示的二进制文件。这已经不是二维码的问题了。我考虑可能是服务器不能识别返回的数据类型，
比如没有告诉他我要返回一张图片，事实证明果然是这样的，需要设置返回类型，但是我不知道这是哪个
组件造成。

后来设置一下response的返回类型就好了。贴代码

@RequestMapping("/showQr")
public void showQr(HttpServletResponse response){

    // 设置返回类型，禁用缓存
    response.setHeader("Pragma", "no-cache");
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expires", 0);
    response.setContentType("image/jpeg");
    // 请求二维码支付链接
    String qrUrl = getQrContent();
    try {
    // 调用google的二维码API
    QrUtil.createQrCode(response.getOutputStream(), qrUrl);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

不要在意流没有关闭这些细节，重点关注这一句response.setContentType("image/jpeg")。

后台返回的数据为前需要获取数据后进行转换
js文件
let url = ‘后台接口地址’
var that=this
wx.request({
url: url,
method: ‘GET’,
　　 header: {
　　 ‘Authorization’:‘token值’//请求头加入token值
　　},
responseType: ‘arraybuffer’, //将原本按文本解析修改为arraybuffer
success: function(res) {
　　//转为base64后赋值
that.setData({
imgUrl: wx.arrayBufferToBase64(res.data)
})
}
})
xwml文件<image src="https://img-blog.csdnimg.cn/2022010617285390903.jpeg"></image>

python下二进制流文件转二维码

之前做过的一个ctf中的misc，经过一系列操作得到一个flag.txt
里面是一串二进制流
突然束手无策

经简单计算
260^2=67600
所以尝试能否转化为一个二维码

网上找了好久，没找到好用的轮子
然后果断寻求大佬帮助

大佬毕竟还是大佬啊
这里直接祭出源码

import PIL
from PIL import Image
MAX = 260
img = Image.new("RGB",(MAX,MAX))
str="000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000111111111111111111111111111111111111111111111111111111111110000000000000000000000000111111110000000000000000011111111111111111000000001111111111111111100000000000000000111111110000000011111111111111111111111111111111111111111111111111111111111000000000000000001111111111111111111111111111111111111111111111111111111111100000000000000000000000001111111100000000000000000111111111111111110000000011111111111111111000000000000000001111111100000000111111111111111111111111111111111111111111111111111111111110000000000000000011111111111111111111111111111111111111111111111111111111111000000000000000000000000011111111000000000000000001111111111111111100000000111111111111111110000000000000000011111111000000001111111111111111111111111111111111111111111111111111111111100000000000000000111111111111111111111111111111111111111111111111111111111110000000000000000000000000111111110000000000000000011111111111111111000000001111111111111111100000000000000000111111110000000011111111111111111111111111111111111111111111111111111111111000000000000000001111111111111111111111111111111111111111111111111111111111100000000000000000000000001111111100000000000000000111111111111111110000000011111111111111111000000000000000001111111100000000111111111111111111111111111111111111111111111111111111111110000000000000000011111111111111111111111111111111111111111111111111111111111000000000000000000000000011111111000000000000000001111111111111111100000000111111111111111110000000000000000011111111000000001111111111111111111111111111111111111111111111111111111111100000000000000000111111111111111111111111111111111111111111111111111111111110000000000000000000000000111111110000000000000000011111111111111111000000001111111111111111100000000000000000111111110000000011111111111111111111111111111111111111111111111111111111111000000000000000001111111111111111111111111111111111111111111111111111111111100000000000000000000000001111111100000000000000000111111111111111110000000011111111111111111000000000000000001111111100000000111111111111111111111111111111111111111111111111111111111110000000000000000011111111000000000000000000000000000000000000000000111111111000000000000000011111111111111111000000000111111111111111111111111111111111000000000000000000000000000000000011111111000000001111111110000000000000000000000000000000000000000001111111100000000000000000111111110000000000000000000000000000000000000000001111111110000000000000000111111111111111110000000001111111111111111111111111111111110000000000000000000000000000000000111111110000000011111111100000000000000000000000000000000000000000011111111000000000000000001111111100000000000000000000000000000000000000000011111111100000000000000001111111111111111100000000011111111111111111111111111111111100000000000000000000000000000000001111111100000000111111111000000000000000000000000000000000000000000111111110000000000000000011111111000000000000000000000000000000000000000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i = 0
for y in range (0,MAX):


    for x in range (0,MAX):


        if(str[i] == '1'):


            img.putpixel([x,y],(0, 0, 0))


        else:


            img.putpixel([x,y],(255,255,255))


        i = i+1
img.show()
img.save("flag.png")

然后这里需要注意
win下的PIL并不太容易装
而kali下集成了python环境，而且内置很多库
所以这里需要在kali下run
然后秒出

同时在文件夹下多了一个这玩意