checking whether a package is existent or not

How can i check whether a package like javax.servlet.* exists开发者_StackOverflow or not in my installation of java?Java can only tell you if it can load a class. It can\'t tell you if a package exist

Can sphinx be used over cassandra?

I am planning to build a cassandra store system and also I need a full-text(Chinese) system too. Can sphinx be used on cassandra? (sphinx supports xml f开发者_Python百科ormat but I am not going to use

Regular Expression for Credit Card Track Data

Are there any known regular expressions out there to validate credit card track 1 and track 2 data? EDIT:

window.print() not working in IE

I am doing something like this in javascript to print a section of my page on click of a link function printDiv() {

继承者们什么时候更新呀？

冯永超 2022-04-18 14:39 开发者_运维技巧继承者们什么时候更新呀

Howto find unmarked strings with gettext?

Does gettext have a way to warn me about strings that have not been wrapped in _() or N_()? Basically is there a way to get a list of all string开发者_如何学Gos that do NOT match the keywords used by

Difference in clientX and clientY when going out of the browser on ie/ff

I just ran into a little problem with clientX and clientY. I put a little event to detect if the mouse goes out of the window and to know where it exits. And there come the trouble, it works fine wi

react router的path 和url有什么区别？？

。。。。？

_WeCh****299017 开发者_JS百科2022-04-19 20:47少年少年 2022-04-19 20:开发者_开发知识库50

新 Pixi 3 可运行 WP、Android 或 Firefox OS？

阿尔卡特宣布推出一款全新的低端智能手机Pixi3，运行三个操作系统版本：WindowsPhone、Android或FirefoxOS——我猜Pixi3是预装系统之一，不过也可以用工具切换其他系统，不过设备本体针对不同的系统版本有相应的按钮