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  Generate certificate in Java -- Self signed certificate

This is the first post in this series which I will show you how to generate SSL certificate in Java programmatically. Certificates are frequently used in SSL communication which requires the authentication of server to client. This is to make the client to trust that the server is actually the one it claims. Certificates are really important on the Internet. All HTTPS communications on the Internet need the server side to present their certificates signed by trusted CAs. The basic flow of a requ...

   Java,Certificate,X509     2014-07-30 07:42:18

  About short URL and its implementation

IntroductionURL shortening is a kind of technique to convert a long URL to a short URL. There are many companies now providing this kind of service, we now take Google's URL shortener service http://goo.gl/ as an example.First we navigate to http://goo.gl/, then we enter a random URL into the text field, here we use http://www.url-to-be-shortened.com as the input, it will return us an shortened URL : http://goo.gl/ZSVMM. URL ParsingWhen we type http://goo.gl/ZSVMM in browser address bar, the DNS...

       2012-07-02 07:15:09

  Here is what XcodeGhost author says

The first compiler malware in iOS was disclosed by Chinese iOS developers on Wednesday(Beijing time). The name of this malware is XcodeGhost as described by Alibaba researchers who released the analysis of this malware.  The malicious code is located in a Mach-O object file that was repackaged into some versions of Xcode installers. These malicious installers were then uploaded to Baidu’s cloud file sharing service for used by Chinese iOS/OS X developers. Xcode is Apple’s offic...

   IOS,SECURITY,XCODEGHOST,APP STORE,APPLE     2015-09-18 20:51:38

  The biggest change ever of iOS--iOS 7

In this year's WWDC, Apple unveils its new iOS--iOS 7. The new iOS has the most significant change since it first came to the public. But many people may be disappointed about this. I am not one of them. In WWDC, Tim Cook said iOS 7 is more flatter than before and it has a completely new user interface design, new slide to unlock feature, official share and weather apps are redesigned. The weather apple now has almost the same feature as the newly updated Yahoo weather application. Ive said the...

   iOS 7,new design,Apple     2013-06-10 22:39:45

  The Tale Of Perfect Checkout Page & Magento Online Store

I bet you've already googled every bit of advice on how to win customers. You've installed and integrated bazillions of extensions and marketing tools, rewritten every piece of text on your site, redesigned and rebranded your Magento store. In case you're still wondering why clients keep coming and going away without purchasing your goods, this article is for you. I solemnly declare that every single piece of advice on leading a customer to buy from your online store, you've read so far is imper...

   magento, magento user experience, ecommerce, online business     2015-04-16 21:15:09

  A HTTPS client and HTTPS server demo in Java

In this post, I will create a HTTPS server and HTTPS client demo which can establish HTTPS communication between a server and a client using Java. This should be very useful when we want to test our understanding about SSL communication. We will use both a detailed SSL client and a simple HttpsURLConnection as the HTTPS client. Before creating the actual HTTPS server and HTTPS client, we first need to generate the keystore and truststore to be used by the server and client. To generate the keyst...

   SSL,HTTPS,JAVA,DEMO     2015-10-23 09:04:36

  When will Google be back to China?

There will be news about Google returning back to China every now and then since the search giant left China in 2010. Every sign of change about Google in China will give people big hope on its return. But Chinese are still waiting for the dream to become true though nothing real happen until now. On Thursday, it seems there is "proof" again that Google is going back to China. In the morning, many Chinese noticed that the official Google China weibo(China's Twitter) account uploaded a photo with...

   GOOGLE,CHINA,SEARCH ENGINE,BAIDU     2017-03-02 09:39:51

  Use Java ThreadLocal with caution

According to Oracle documentation, ThreadLocal is a class provides thread-local variables. These variables differ from their normal counterparts in that each thread that accesses one (via its get or set method) has its own, independently initialized copy of the variable. ThreadLocal instances are typically private static fields in classes that wish to associate state with a thread. In short, ThreadLocal variables are variables belong to a thread, not a class or an instance of a class. One common...

   JAVA,MEMORY LEAK, THREADLOCAL     2015-11-03 07:31:57

  Embrace open source

In past few days, there are many tech news which are related to open source. For example, Microsoft enables Linux on its Windows Azure cloud, Facebook open sourced its C++ library Folly and Samsung joined Linux foundation. Now more and more big companies realize the power of open source and are willing to contribute to the open source community. It will benefit not only developers but also these big companies as well.By providing some open source libraries or projects, developer may reduce their...

   Open source,Microsoft,Samsung,Facebook,Linux     2012-06-06 05:37:59

  Read white space with scanf()

Usually, when we want to enter string with white spaces in C, we need to call gets() or fgets(0 method. We usually will not use scanf(0 or fscanf() because they cannot accept white spaces when scan user inputs.   But when we specify the format in scanf() function, we may read strings with white space. the code section below illustrate this: #include <stdio.h>   int main(int argc,char **argv){        char name[30];      fprintf(stdout,"Please en...

   C,scanf,white space, string format     2011-09-26 11:45:43

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