Tutorial Site

useful_commands - created

chongtin (chongtin@undisclosed.example.com) — 2023-02-13T15:11:16+00:00

to be written...

Programming - *

chongtin (chongtin@undisclosed.example.com) — 2023-02-13T15:09:20+00:00

Why creating this site? Mostly for myself because I forget stuff all the time, and computer science is just too much stuff need to be remembered. I think it would be good to have a place to write down some notes in case I need to do something again and forgot. Feel free to look around, and see if the ads above and below has the content you are interested in (Well, you know

Basic Websocket

chongtin (chongtin@undisclosed.example.com) — 2021-10-07T12:06:09+00:00

Basic Websocket This is going to build a STOMP based websocket on server site. * Add dependency to POM.XML * Add a EnableWebSocketMessageBroker configuration * Add a controller to handle the web socket package. Add dependency to POM.XML Add the following in POM.XML

Redux

chongtin (chongtin@undisclosed.example.com) — 2021-09-29T17:17:32+00:00

Redux * Install redux, react-redux, and update the react-dom * Create a reducer for storing the state, and handle the dispatched task * Create the store in index.js, and provide it to the app by * Using redux in your component:

Check Remote Server Cert with Openssl - created

chongtin (chongtin@undisclosed.example.com) — 2021-09-24T11:44:12+00:00

Check Remote Server Cert with Openssl Assume the server IP is 111.111.111.111, and we are interested in its port 443. echo | openssl s_client -showcerts -connect 111.111.111.111:443 2>/dev/null | openssl x509 -inform pem -noout -text

Levenshtein Distance

chongtin (chongtin@undisclosed.example.com) — 2021-07-22T16:30:10+00:00

Levenshtein Distance Levenshtein Distance is a method to check the similarity of wo string. If the string is very similar, we will get a small value for the distance. If the two strings are completely off, we get the value of max string lenth as the distance.

Adding Customized Properties in Application.properties file - created

chongtin (chongtin@undisclosed.example.com) — 2021-05-25T15:41:58+00:00

Adding Customized Properties in Application.properties file * In application.properties files, add your own properties such as mypropertis.version=dev in the empty space. Here we use mypropertis as prefix, you can use whatever you want. * To read such value, create a class as a @Component

Using puppeteer to Capture Screenshot of a Website

chongtin (chongtin@undisclosed.example.com) — 2021-05-13T09:31:09+00:00

Using puppeteer to Capture Screenshot of a Website puppeteer is a tools created by Google to control the chrome/Chromium browser by script. It is useful for automatic testing website, or use it to control a headless browser. To use puppeteer to capture screenshot of a site, do:

Adding crt to Java cacerts - [Adding jks to Java cacerts]

chongtin (chongtin@undisclosed.example.com) — 2021-05-11T15:14:08+00:00

Adding crt to Java cacerts Adding crt file allows Java to access your self-signed ssl site without doing something like Insecurity HTTPS Connection. Assume the location of your Java JDK is in C:\Program Files\Java\jdk1.8.0_131\. The following steps add the crt to Java key store:

reject:react-grid.png

chongtin (chongtin@undisclosed.example.com) — 2020-10-27T09:31:15+00:00

java:jna.png - created

chongtin (chongtin@undisclosed.example.com) — 2020-07-29T17:44:32+00:00

reject:react_com_life_cycle.png - created

chongtin (chongtin@undisclosed.example.com) — 2020-07-21T10:06:20+00:00

reject:react_css.png - created

chongtin (chongtin@undisclosed.example.com) — 2020-07-13T17:02:21+00:00

reject:react_list.png - created

chongtin (chongtin@undisclosed.example.com) — 2020-07-13T16:03:24+00:00

springboot:sping_init.png - created

chongtin (chongtin@undisclosed.example.com) — 2020-05-21T10:55:57+00:00

reject:react_exe1.png - created

chongtin (chongtin@undisclosed.example.com) — 2020-01-07T08:53:00+00:00

ng:ng_emitter.png - created

chongtin (chongtin@undisclosed.example.com) — 2019-11-19T17:56:00+00:00

ng:ng_service.png - created

chongtin (chongtin@undisclosed.example.com) — 2019-11-19T16:07:50+00:00

ng:ngfor.png - created

chongtin (chongtin@undisclosed.example.com) — 2019-11-18T17:19:44+00:00

ng:ngclass.png - created

chongtin (chongtin@undisclosed.example.com) — 2019-11-18T16:58:04+00:00