jason | Jason's Blog

由于certbot更新,之前的方法失效.

新版本需要编辑let’s encrypt的配置文件,默认的配置文件在/etc/letsencrypt/cli.ini

vim /etc/letsencrypt/cli.ini

然后增加key-type和cert-name两行

key-type = ecdsa
cert-name = t2t2.cc_ecdsa_jason19659

key-type = ecdsa
最后执行正常的命令生成证书就可以了,

sudo certbot --nginx

新版本比旧版本简单多了.

问题: ups询价和下单过慢.

之前的解决方案为,在美国的服务器上部署一套代理项目,只有询价.但是问题也随之而来,每次修改相关代码的时候需要修改2个项目,需要全部进行重新部署,代理项目的代码和现行代码版本差距过大,不易扩展.

现阶废弃方案,把下单的代码加入到代理项目中.这么做还是很麻烦,每次修改都要修改两个项目并且重新部署,而且每次都要把代码拷贝一份,毫无意义.

于是乎现阶段我选择一个更为激进的方案,把该部分修改为RPC调用,搭一套分布式系统,正所谓不整活活着就没意义.把正常的服务放在国内服务器上,把下单和询价部分放在美国服务器上,通过RPC调用可以成功的绕过封锁提升速度,而且还可以部署多个节点,在世界多地放置服务器,提升查询速度.

使用DUBBO,它的坑在于目前还在迭代,3.0正在研发当中,现在只能使用2.7版本.而且对zookeeper和相关类库的版本要求极为严格,一旦对不上是无法启动的,只能更换版本自己慢慢试.一旦无法连接和无法访问,报错信息极为模糊,跟本无法精准的找到原因.

现阶段在三台服务器上跑了zookeeper集群,原线上服务器不动,在ups代理服务器上跑提供者.原线上项目作为消费者.注册中心目前看起来还没有使用的必要,下次整活再加上吧.

还有,每个东西都要实现Serializable真的好烦

技术细节在其他的内部文档中.

整活真开心

2021年5月24日 17:36:17

Jason

感谢v2ex用户zerision提供的鼠标点击特效源码原帖：https://www.v2ex.com/t/656062

function clickEffect() {
    let balls = [];
    let longPressed = false;
    let longPress;
    let multiplier = 0;
    let width, height;
    let origin;
    let normal;
    let ctx;
    const colours = ["#F73859", "#14FFEC", "#00E0FF", "#FF99FE", "#FAF15D"];
    const canvas = document.createElement("canvas");
    document.body.appendChild(canvas);
    canvas.setAttribute("style", "width: 100%; height: 100%; top: 0; left: 0; z-index: 99999; position: fixed; pointer-events: none;");
    const pointer = document.createElement("span");
    pointer.classList.add("pointer");
    document.body.appendChild(pointer);

    if (canvas.getContext && window.addEventListener) {
        ctx = canvas.getContext("2d");
        updateSize();
        window.addEventListener('resize', updateSize, false);
        loop();
        window.addEventListener("mousedown", function(e) {
            pushBalls(randBetween(10, 20), e.clientX, e.clientY);
            document.body.classList.add("is-pressed");
            longPress = setTimeout(function() {
                document.body.classList.add("is-longpress");
                longPressed = true;
            }, 500);
        }, false);
        window.addEventListener("mouseup", function(e) {
            clearInterval(longPress);
            if (longPressed == true) {
                document.body.classList.remove("is-longpress");
                pushBalls(randBetween(50 + Math.ceil(multiplier), 100 + Math.ceil(multiplier)), e.clientX, e.clientY);
                longPressed = false;
            }
            document.body.classList.remove("is-pressed");
        }, false);
        window.addEventListener("mousemove", function(e) {
            let x = e.clientX;
            let y = e.clientY;
            pointer.style.top = y + "px";
            pointer.style.left = x + "px";
        }, false);
    } else {
        console.log("canvas or addEventListener is unsupported!");
    }

    function updateSize() {
        canvas.width = window.innerWidth * 2;
        canvas.height = window.innerHeight * 2;
        canvas.style.width = window.innerWidth + 'px';
        canvas.style.height = window.innerHeight + 'px';
        ctx.scale(2, 2);
        width = (canvas.width = window.innerWidth);
        height = (canvas.height = window.innerHeight);
        origin = {
            x: width / 2,
            y: height / 2
        };
        normal = {
            x: width / 2,
            y: height / 2
        };
    }
    class Ball {
        constructor(x=origin.x, y=origin.y) {
            this.x = x;
            this.y = y;
            this.angle = Math.PI * 2 * Math.random();
            if (longPressed == true) {
                this.multiplier = randBetween(14 + multiplier, 15 + multiplier);
            } else {
                this.multiplier = randBetween(6, 12);
            }
            this.vx = (this.multiplier + Math.random() * 0.5) * Math.cos(this.angle);
            this.vy = (this.multiplier + Math.random() * 0.5) * Math.sin(this.angle);
            this.r = randBetween(8, 12) + 3 * Math.random();
            this.color = colours[Math.floor(Math.random() * colours.length)];
        }
        update() {
            this.x += this.vx - normal.x;
            this.y += this.vy - normal.y;
            normal.x = -2 / window.innerWidth * Math.sin(this.angle);
            normal.y = -2 / window.innerHeight * Math.cos(this.angle);
            this.r -= 0.3;
            this.vx *= 0.9;
            this.vy *= 0.9;
        }
    }

    function pushBalls(count=1, x=origin.x, y=origin.y) {
        for (let i = 0; i < count; i++) {
            balls.push(new Ball(x,y));
        }
    }

    function randBetween(min, max) {
        return Math.floor(Math.random() * max) + min;
    }

    function loop() {
        ctx.fillStyle = "rgba(255, 255, 255, 0)";
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        for (let i = 0; i < balls.length; i++) {
            let b = balls[i];
            if (b.r < 0)
                continue;
            ctx.fillStyle = b.color;
            ctx.beginPath();
            ctx.arc(b.x, b.y, b.r, 0, Math.PI * 2, false);
            ctx.fill();
            b.update();
        }
        if (longPressed == true) {
            multiplier += 0.2;
        } else if (!longPressed && multiplier >= 0) {
            multiplier -= 0.4;
        }
        removeBall();
        requestAnimationFrame(loop);
    }

    function removeBall() {
        for (let i = 0; i < balls.length; i++) {
            let b = balls[i];
            if (b.x + b.r < 0 || b.x - b.r > width || b.y + b.r < 0 || b.y - b.r > height || b.r < 0) {
                balls.splice(i, 1);
            }
        }
    }
}

为了防止误卸载车机应用，应用均已备份了一份

下载链接

链接：https://pan.baidu.com/s/1_-NkFbRhbzWe1tLwpCp3Ew
提取码：d89f

md5

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最近发现youtube的证书使用了新的椭圆曲线算法，于是我也想折腾弄了一下。
1.首先需要生成椭圆曲线算法的密钥命令

openssl ecparam -genkey -name secp384r1 | sudo openssl ec -out private.key

如果已经有密钥可以跳过这步，我使用的算法是secp256r1
2.接下来需要安装certbot，这部不多说了。
3.需要创建配置文件如 cert.conf

[req]
distinguished_name = req_distinguished_name
req_extensions = v3_req
 
[req_distinguished_name]
 
[v3_req]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names
 
[alt_names]
DNS.1 = t2t2.cc
DNS.2 = www.t2t2.cc
DNS.3 = jason19659.pw
DNS.4 = www.jason19659.pw

DNS写自己的域名，然后保存为文件
4.

openssl req -new -sha256 -key private.key -out public.csr -subj "/C=IN/ST=Goa/L=Ponda/O=Priolkar Elf/CN=t2t2.cc" -config cert.conf

生成csr.
5.生成证书命令：

letsencrypt certonly --hsts -w /var/www/blog/ -d t2t2.cc -d jason19659.pw --email jason19659@163.com --csr "public.csr"

-d 为需要生成证书的域名 -w是网站根目录，可以直接访问到的 –csr是csr文件位置。
6.生成之后 private是ssl_certificate_key。

– Congratulations! Your certificate and chain have been saved at:
/ssl/t2t2.cc/0001_chain.pem

生成之后会提示ssl_certificate在哪

本站已将统计插件从CNZZ更换到google GA。

嗯。。不知道。。

继续转载当年的坑系列，这个系列的题目都是当年从各种坑中收集而来的。
本题中只要有跟final字符串有关的操作，最后结果都相等

false

true


                String ab = "ab";
			
	        String a = "a";
	        String b = a +"b";
	        System.out.println(b == ab);
	        
	        final String s12 = "a";
	        String s22 = s12 +"b";
	        System.out.println(s22 == ab);
	        
	        final String s1 = "ab";
	        String s4 = "abcdef";
	        String s5 = s1 + "cdef";
	        String s6 = "ab" + "cdef";
	        System.out.println(s4 == s5);
	        System.out.println(s4 == s6);
	        System.out.println(s5 == s6);

继续转载当年的坑系列，这个系列的题目都是当年从各种坑中收集而来的。


	public class Test23 {
		static {
			name = "B";
		}
		static String name = "A";
		static {
			System.out.println(name);
		}
	
		public Test23() {
			System.out.println("初始化" + name);
		}
	
		public static void main(String[] args) {
	
		}
	}

会输出什么？
答案：
Continue reading →

继续转载当年的坑系列，这个系列的题目都是当年从各种坑中收集而来的。

public class 初始化重载 {
    public static void main(String[] args) {
        new Derived();
    }
}
 
class Base {
    private int i = 2;
     
    public Base() {
        display();
    }
    public void display() {
        System.out.println(i);
    }
}
 
class Derived extends Base {
    private int i = 22;
     
    public Derived() {
        i = 222;
    }
     
    public void display() {
        System.out.println(i);
    }
}

问：会输出什么？
答案：
Continue reading →

Jason's Blog

Author Archives: jason

let’s encrypt新版本certbot如何生成椭圆曲线算法的https证书

对ups询价和下单的改造

新增了鼠标点击特效

吉利缤越车机应用备份

如何使用let’s encrypt搭建椭圆曲线算法的https证书

本站已将统计插件从CNZZ更换到google GA

写点什么呢。。。

java final String的坑

java static初始化顺序

java 继承重载初始化的坑