簡介 JavaEE在開發的時候,如果是系統內部常量,一般提倡用枚舉常量類,寫在單獨的類中,但是經常要修改的變量,比如數據源配置,如果存在數據庫中,有種浪費。但是存在TXT中擴展性不好,就筆者觀察,一般的程序員都喜歡把經常修改的常量存在xml文件或者properties文件。 存在xml文件最大的好處是擴展性很好,一般用sax或者dom這兩個方向的框架,比如DOM4J,JDOM等。Sun推出的JAXM(Java API for XML Messaging)也是用的DOM4J。由于SAX的處理方式類似流媒體,是逐行的,不需要全部加載。而DOM是全部加載在內存,生成樹。因而SAX的讀取比DOM性能好,但是修改的話DOM略勝一籌。properties文件的擴展性不如xml,但是有很多xml沒法實現的優勢,比如加密之類的~ Helloworld 筆者根據自己開發中感受,寫了一個工具包,用來體現讀取xml或者properties的流程,大家在使用的時候記得修改文件路徑。一共包含五個文件.本demo主要是用來模擬讀取數據庫的賬戶和密碼的,讀者可以在此基礎上擴展。
標簽: JavaEE
上傳時間: 2017-05-31
上傳用戶:change0329
將魔王的語言抽象為人類的語言:魔王語言由以下兩種規則由人的語言逐步抽象上去的:α-〉β1β2β3…βm ;θδ1δ2…-〉θδnθδn-1…θδ1 設大寫字母表示魔王的語言,小寫字母表示人的語言B-〉tAdA,A-〉sae,eg:B(ehnxgz)B解釋為tsaedsaeezegexenehetsaedsae對應的話是:“天上一只鵝地上一只鵝鵝追鵝趕鵝下鵝蛋鵝恨鵝天上一只鵝地上一只鵝”。(t-天d-地s-上a-一只e-鵝z-追g-趕x-下n-蛋h-恨)
上傳時間: 2013-12-19
上傳用戶:aix008
As I write this foreword, I am collaborating with four leading user interface (UI) component vendors on a presentation for the 2004 JavaOneSM conference. In our presentation, the vendors will show how they leverage JavaServerTM Faces technology in their products. While developing the presentation, I am learning some things about the work we’ve been doing on JavaServer Faces for the past three years. The vendors have their own set of concerns unique to adapting their product for JavaServer Faces, but they all voice one opinion loud and clear: they are very relieved to finally have a standard for web-based user interfaces.
標簽: collaborating component interface foreword
上傳時間: 2014-08-27
上傳用戶:時代電子小智
Mastering Dojo will teach you how to build an Internet application that will impress your end users and delight you while you’re writing it. The book also explains Dojo’s JavaScript underpinnings, both for newcomers and for refugees from other languages.
標簽: will application Mastering Internet
上傳時間: 2017-07-02
上傳用戶:chenbhdt
本代碼為編碼開關代碼,編碼開關也就是數字音響中的 360度旋轉的數字音量以及顯示器上用的(單鍵飛梭開 關)等類似鼠標滾輪的手動計數輸入設備。 我使用的編碼開關為5個引腳的,其中2個引腳為按下 轉輪開關(也就相當于鼠標中鍵)。另外3個引腳用來 檢測旋轉方向以及旋轉步數的檢測端。引腳分別為a,b,c b接地a,c分別接到P2.0和P2.1口并分別接兩個10K上拉 電阻,并且a,c需要分別對地接一個104的電容,否則 因為編碼開關的觸點抖動會引起輕微誤動作。本程序不 使用定時器,不占用中斷,不使用延時代碼,并對每個 細分步數進行判斷,避免一切誤動作,性能超級穩定。 我使用的編碼器是APLS的EC11B可以參照附件的時序圖 編碼器控制流水燈最能說明問題,下面是以一段流水 燈來演示。
上傳時間: 2017-07-03
上傳用戶:gaojiao1999
【問題描述】 在一個N*N的點陣中,如N=4,你現在站在(1,1),出口在(4,4)。你可以通過上、下、左、右四種移動方法,在迷宮內行走,但是同一個位置不可以訪問兩次,亦不可以越界。表格最上面的一行加黑數字A[1..4]分別表示迷宮第I列中需要訪問并僅可以訪問的格子數。右邊一行加下劃線數字B[1..4]則表示迷宮第I行需要訪問并僅可以訪問的格子數。如圖中帶括號紅色數字就是一條符合條件的路線。 給定N,A[1..N] B[1..N]。輸出一條符合條件的路線,若無解,輸出NO ANSWER。(使用U,D,L,R分別表示上、下、左、右。) 2 2 1 2 (4,4) 1 (2,3) (3,3) (4,3) 3 (1,2) (2,2) 2 (1,1) 1 【輸入格式】 第一行是數m (n < 6 )。第二行有n個數,表示a[1]..a[n]。第三行有n個數,表示b[1]..b[n]。 【輸出格式】 僅有一行。若有解則輸出一條可行路線,否則輸出“NO ANSWER”。
標簽: 點陣
上傳時間: 2014-06-21
上傳用戶:llandlu
Abstract—Stable direct and indirect decentralized adaptive radial basis neural network controllers are presented for a class of interconnected nonlinear systems. The feedback and adaptation mechanisms for each subsystem depend only upon local measurements to provide asymptotic tracking of a reference trajectory. Due to the functional approximation capabilities of radial basis neural networks, the dynamics for each subsystem are not required to be linear in a set of unknown coeffi cients as is typically required in decentralized adaptive schemes. In addition, each subsystem is able to adaptively compensate for disturbances and interconnections with unknown bounds.
標簽: decentralized controllers Abstract adaptive
上傳時間: 2017-08-17
上傳用戶:gdgzhym
VC MATLAB 混編示例 ppWizard has created this matlab調用 application for you. This application not only demonstrates the basics of using the Microsoft Foundation classes but is also a starting point for writing your application. This file contains a summary of what you will find in each of the files that make up your matlab調用 application.
標簽: application ppWizard created MATLAB
上傳時間: 2014-01-10
上傳用戶:小碼農lz
Mac layer API for ARM based
標簽: WSN APi code
上傳時間: 2015-04-23
上傳用戶:autozbj
An application that adds products to an electronic shopping cart. The application uses three classes: Product, ShoppingCart, and ShoppingCartApplication. Part of the work has been done for you and is provided in the student archive. You will implement the method in ShoppingCartApplication that reads product information from the keyboard and creates a Product object.
標簽: Product ShoppingCart
上傳時間: 2015-11-12
上傳用戶:chengzi74