Fu Cheng alexcheng1982

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Coder / Content Creator / Spring AI Cookbook on Leanpub (in progress)

alexcheng1982 / gson_streaming.java

Last active December 23, 2015 11:39

GSON JSON writer streaming

	Object result = getResult();
	if (result instanceof List) {
	StringWriter output = new StringWriter();
	JsonWriter jsonWriter = new JsonWriter(output);
	List list = (List) result;
	jsonWriter.beginArray();
	for (int i = 0, n = list.size(); i < n; i++) {
	Object obj = list.get(i);
	GSON.toJson(obj, obj.getClass(), jsonWriter);
	}

alexcheng1982 / RawUdpPacketSender.java

Last active November 18, 2019 05:52

Send raw UDP packet in Java http://midgetontoes.com/blog/2013/10/23/send-raw-udp-packets-in-java/

	package demo;

	import org.jnetpcap.Pcap;
	import org.jnetpcap.PcapIf;
	import org.jnetpcap.packet.JMemoryPacket;
	import org.jnetpcap.packet.JPacket;
	import org.jnetpcap.protocol.JProtocol;
	import org.jnetpcap.protocol.lan.Ethernet;
	import org.jnetpcap.protocol.network.Ip4;
	import org.jnetpcap.protocol.tcpip.Udp;

alexcheng1982 / magento_categories.rb

Created February 28, 2014 22:14

Use Ruby to get Magento categories http://midgetontoes.com/blog/2014/03/01/use-web-service-to-get-magento-categories/

	require 'savon'

	categories = []

	def process(categories, category)
	categories << {:id => get_category_value(category, 'category_id'),
	:name => get_category_value(category, 'name')}
	children = get_category_value(category, 'children')
	return if children.nil? or children[:item].nil?
	childrenItem = children[:item]

alexcheng1982 / file_watch_sample.rb

Last active August 29, 2015 13:57

Watch File System Changes and Trigger Script http://midgetontoes.com/blog/2014/03/22/ruby-watch-file-system-changes-and-trigger-script/

	#!/usr/bin/env ruby

	require 'optparse'
	require 'fssm'
	require 'rbconfig'

	THIS_FILE = File.expand_path(__FILE__)

	RUBY = File.join(RbConfig::CONFIG['bindir'], RbConfig::CONFIG['ruby_install_name'])

alexcheng1982 / active_page.rb

Created April 8, 2014 21:35

Jekyll - Bootstrap Navbar Active Status for Different Pages See http://midgetontoes.com/blog/2014/04/09/jekyll-bootstrap-navbar-active-status-for-different-pages/

	module SampleApp
	class ActivePageTag < Liquid::Tag
	def initialize(tag_name, text, tokens)
	super
	@text = text
	end

	def render(context)
	name = context.environments.first["page"]["name"]
	return '' if name.nil? or @text.nil?

alexcheng1982 / controller.coffee

Created April 16, 2014 10:20

AngularJS - Delay Controller Initialization for Asynchronous Operations http://midgetontoes.com/blog/2014/04/15/angularjs-delay-controller-initialization-for-asynchronous-operations/

	angular.module('controllers', ['services'])
	.controller('MyCtrl', ['$scope', ($scope) ->

	$scope.$watch('dataReady', (ready) ->
	init() if ready
	)

	init = () ->
	console.log('Init')
	])

alexcheng1982 / local2rds.bash

Last active August 29, 2015 14:13

Importing Data from a MySQL DB to an Amazon RDS MySQL DB Instance

	sudo mysqldump --databases world --single-transaction --compress --order-by-primary –u <local_user> -p<local_password>
	\| mysql --host hostname –-port 3306 –u <RDS_user_name> –p<RDS_password>

alexcheng1982 / wrapperAngularElement.js

Last active August 29, 2015 14:14

Wrap angular element using jQuery

$(element[0]).find('input[type=text]');

alexcheng1982 / flushCache.txt

Created January 27, 2015 20:45

Flush Linux system memory cache

	free -m && sync && echo 3 > /proc/sys/vm/drop_caches && free -m

	Flush daily using crontab:
	0 0 * * * sudo free -m && sync && echo 3 > /proc/sys/vm/drop_caches && free -m

alexcheng1982 / random.java

Last active August 29, 2015 14:21

Generate random string

	public String getRandomString(String prefix) {
	return prefix + "_" + UUID.randomUUID().toString().replaceAll("-", "");
	}