uuid | 易学教程

Generate a custom formated string with python

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问题 I have a Javascript code that generates a string (similar to uuid) string Here it is the js code: var t = "xxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxxxxxx" , i = (new Date).getTime(); return e = t.replace(/[x]/g, function() { var e = (i + 16 * Math.random()) % 16 | 0; return i = Math.floor(i / 16), e.toString(16) }) How can I generate this string with python? 回答1: Using regular expression substitution and the new secrets module of Python 3.6 - this is not equivalent to the JavaScript code because this

Way to create common name-based UUIDs in Java and PHP

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问题 Team Sof, I have a requirement to generate name-based UUIDs for my project. The catch is that FE uses PHP to generate identifiers based on a string, and BE uses Java to create those UUIDs based on same string. Is there some package in PHP and Java that generate same UUID based on a string. I tried to generate UUID in Java using UUID.nameUUIDFromBytes(name.getBytes()).toString() method from java.util.UUID . In case of PHP, I am finding a module that generates same UUID 回答1: Java's UUID

How to make v-for :key unique?

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问题 I am having issues with items not properly adding/deleting from array, and I know it is because I need to be using something unique for my :key property. My app renders with a grid-item labeled Step:0 , if I create a Step 1 and Step 2 , and then I delete Step 1 , and add another step, then both the step 1 and new step 2 drag with each other at the same time. Currently my key is index for troubleshooting purposes, but I want my key to be step.uuid I have added a library with the function

How to generate Universally Unique IDentifier, UUID from LoadRunner independent of the OS

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问题 I have experienced the need of generating UUID in LoadRunner several times while scripting but there is no in-build function to do so. I am using both linux and windows load generators. Thanks to Scott Moore for writing the below code which uses windows in-build CoCreateGuid function (dependent on ole32.dll) to generate required UUID. However that code is completely dependent on windows platform and doesn't work in Linux platform. How can we generate UUID from Loadrunner independent of OS?

BLE receiving GATT notifications from a characteristic

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问题 I want to receive notifications when this characteristic is changed Micro:Bit. What I'm doing is basically the following: 1) Check if the system is compatible with BLE 2) Enable bluetooth in case it's disabled 3) Connect to the only one paired device (Micro:Bit) 4) Activate this code when connectivity changes (¿Connected/Disconnected?) 5) Activate this code when characteristic is updated ¿? public class MainActivity extends Activity { BluetoothAdapter bleAdapter; @Override protected void

UUID generator problem

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问题 I have a uuid class that is part of a portable library that gets initialized with the following piece of code. It works fine under windows, but under linux it's not generating UUID's correctly. uint32 data[4]; data[0] = rng.Get(); data[1] = rng.Get(); data[2] = rng.Get(); data[3] = rng.Get(); data[1] = (data[1] & 0xffffff0f) | 0x40; data[2] = (data[2] & 0x7fffffff) | 0x40000000; printf("12345678901234567890123456789012\n"); memcpy(uuid, data, 16); for (int i = 0; i < 4; i++) printf("%04X",

jsp之大文件分段上传、断点续传

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1，项目调研因为需要研究下断点上传的问题。找了很久终于找到一个比较好的项目。在GoogleCode上面，代码弄下来超级不方便，还是配置hosts才好，把代码重新上传到了github上面。 https://github.com/freewebsys/java-large-file-uploader-demo 效果：上传中，显示进度，时间，百分比。点击【Pause】暂停，点击【Resume】继续。 2，代码分析原始项目： https://code.google.com/p/java-large-file-uploader/ 这个项目最后更新的时间是 2012 年，项目进行了封装使用最简单的方法实现了http的断点上传。因为html5 里面有读取文件分割文件的类库，所以才可以支持断点上传，所以这个只能在html5 支持的浏览器上面展示。同时，在js 和 java 同时使用 cr32 进行文件块的校验，保证数据上传正确。代码在使用了最新的servlet 3.0 的api，使用了异步执行，监听等方法。上传类UploadServlet @Component("javaLargeFileUploaderServlet") @WebServlet(name = "javaLargeFileUploaderServlet", urlPatterns = { "

Guid to Base64 in Java

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问题 I am converting a Guid to Base64 in C# using the following code: var id = Guid.Parse("be9f1bb6-5c8e-407d-85a3-d5ef31f21b4d"); var base64=Convert.ToBase64String(id.ToByteArray()); Output thufvo5cfUCFo9XvMfIbTQ== When I try to do the same in Java using the following: java.util.Base64.Encoder encoder=Base64.getEncoder(); UUID uuid = UUID.fromString("be9f1bb6-5c8e-407d-85a3-d5ef31f21b4d"); ByteBuffer bb = ByteBuffer.wrap(new byte[16]); bb.putLong(uuid.getMostSignificantBits()); bb.putLong(uuid

MySql 5.7 Function UUID() default collation - Illegal mix of collations

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问题 Problem: MySQL's uuid() default collation does not compare to configured connnection collation. I have a database + tables + fields created with charset: utf-8 and collation utf8_polish_ci. The my.cnf is as follows: init_connect='SET NAMES utf8 COLLATE utf8_polish_ci' character-set-server=utf8 collation-server=utf8_polish_ci character sets: mysql> show variables like "char%"; +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+------

PHP 生成 UUID 函数

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Generate name based md5 UUID (version 3) /** * Generate name based md5 UUID (version 3). * @example '7e57d004-2b97-0e7a-b45f-5387367791cd' */ public function uuid() { // fix for compatibility with 32bit architecture; seed range restricted to 62bit $seed = mt_rand(0, 2147483647) . '#' . mt_rand(0, 2147483647); // Hash the seed and convert to a byte array $val = md5($seed, true); $byte = array_values(unpack('C16', $val)); // extract fields from byte array $tLo = ($byte[0] << 24) | ($byte[1] << 16) | ($byte[2] << 8) | $byte[3]; $tMi = ($byte[4] << 8) | $byte[5]; $tHi = ($byte[6] << 8) | $byte[7];