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简介
JavaEE在开发的时候,如果是系统内部常量,一般提倡用枚举常量类,写在单独的类中,但是经常要修改的变量,比如数据源配置,如果存在数据库中,有种浪费。...
简介
JavaEE在开发的时候,如果是系统内部常量,一般提倡用枚举常量类,写在单独的类中,但是经常要修改的变量,比如数据源配置,如果存在数据库中,有种浪费。但是存在TXT中扩展性不好,就笔者观察,一般的程序员都喜欢把经常修改的常量存在xml文件或者properties文件。
存在xml文件最大的好处是扩展性很好,一般用sax或者dom这两个方向的框架,比如DOM4J,JDOM等。Sun推出的JAXM(Java API for XML Messaging)也是用的DOM4J。由于SAX的处理方式类似流媒体,是逐行的,不需要全部加载。而DOM是全部加载在内存,生成树。因而SAX的读取比DOM性能好,但是修改的话DOM略胜一筹。properties文件的扩展性不如xml,但是有很多xml没法实现的优势,比如加密之类的~
Helloworld
笔者根据自己开发中感受,写了一个工具包,用来体现读取xml或者properties的流程,大家在使用的时候记得修改文件路径。一共包含五个文件.本demo主要是用来模拟读取数据库的账户和密码的,读者可以在此基础上扩展。-Brief introduction
JavaEE development at the time, if the system constants are generally used to promote constant enumeration type, write in a separate category, but often want to modify the variables, such as the data source configuration, if the database exist, in one waste. But the existence of bad TXT extension on my observation, the programmers in general are often modified to enjoy the constant existence xml documents or document properties.
Xml files exist to expand the biggest benef
- 2022-06-01 17:25:12下载
- 积分:1
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建立一个序列号生成器,并称之为小例子程序,其中…
一个建立Oracle序号发生器并调用的小例子程序,其中包含Oracle中序号发生器的建立-establish a serial number generator and called small examples procedures, which include Oracle serial number generator building
- 2023-06-24 22:55:03下载
- 积分:1
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The compression software JAVA games tanks are source files. Interested can downl...
本压缩软件是坦克游戏的JAVA源文件。有兴趣的可以下载-The compression software JAVA games tanks are source files. Interested can download and play
- 2022-02-06 03:49:02下载
- 积分:1
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一个jsp跟dwr结合的实例,通过这个实例教程可以使大家更加深刻的了解JAVA编程技巧。请大家多多指教...
一个jsp跟dwr结合的实例,通过这个实例教程可以使大家更加深刻的了解JAVA编程技巧。请大家多多指教
-Jsp with a combination of dwr example, through the tutorial examples so that everyone can be a more profound understanding of JAVA programming skills. Please exhibitions
- 2022-10-22 10:45:04下载
- 积分:1
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learning are very good examples of EJB
学习EJB的很好范例-learning are very good examples of EJB
- 2023-07-22 15:00:03下载
- 积分:1
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这是使用Java编写一个模仿星际全屏界面的我的Java课程设计。可以选中画面上的单元,并命令其像某点运动(跟星际的操作一样,左键选中,右键确定目的地)。机器的如...
这是使用Java编写一个模仿星际全屏界面的我的Java课程设计。可以选中画面上的单元,并命令其像某点运动(跟星际的操作一样,左键选中,右键确定目的地)。机器的如不支持程序中的分辨率,文字显示可能会有问题。还有就是JDK要1.4以上。-This is written in Java interplanetary imitate a full-screen interface of my Java curriculum design. Images can be selected on the unit, and ordered its campaign as a point (with the Star of the same operation, select Left, right set of destination). The machines do not support the process of resolution and character might be problems. There is JDK 1.4 to above.
- 2022-03-01 02:11:24下载
- 积分:1
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1背包问题算法在java语言的实现程序
0-1背包问题算法在java语言的实现程序-0-1 knapsack problem algorithm java language in the realization process
- 2023-01-15 02:35:04下载
- 积分:1
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这是计算PSNR值和NC值的原始程式码,
用JAVA写成的。(仅参考)...
这是计算PSNR值和NC值的原始程式码,
用JAVA写成的。(仅参考)-This is the calculation of PSNR value and the value of the original NC code, written in JAVA. (Only reference)
- 2022-04-27 04:44:59下载
- 积分:1
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the souce code of thinking in java (1
the souce code of thinking in java (1-10),if you want to learn java ,please read it and you will get more -the souce code of thinking in java (1-10), if you want to learn java, please read it and you will get more
- 2022-05-27 03:01:36下载
- 积分:1
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录音机代码,java小应用程序编写的网站录音代码
录音机代码,java小应用程序编写的网站录音代码-Recorder code, java applets written in the code recording site
- 2022-02-14 18:43:29下载
- 积分:1