?org.apache.commons.configuration.XMLConfiguration;

?

Apache Common-Configuration工具可以從
Properties文件，XML文件,JNDI,JDBC數據源，System Properties,Applet parameters,Servlet Parameters等讀取相應信息

使用步驟

前提，引入commons-configuration-1.6.jar這個JAR包，同時還必須映入commm-logging.jar，common-lang.jar和common-collection.jar

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關于對XML的操作代碼

Java代碼??

<span?style="font-size:?medium;">???public?static?void?testReadXML(){??

????????try?{??

??????????????

????????????XMLConfiguration????config?=?new?XMLConfiguration("config.xml");?

? ? ? ? ? ? //?XMLConfiguration????config?=?new?XMLConfiguration();

? ? ? ? ? ?//config.load("config.xml")

????????????//對于單獨元素的話，可以直接通過標簽名獲取值??

????????????String?str=config.getString("boy");??

????????????System.out.println(str);??

????????????//對于循環出現的嵌套元素，可以通過父元素.子元素來獲取集合值??

????????????List<String>?names=config.getList("student.name");??

????????????System.out.println(Arrays.toString(names.toArray()));??

????????????//對于一個單獨元素包含的值有多個的話如：a,b,c,d?可以通過獲取集合??

????????????List<String>?titles=config.getList("title");??

????????????System.out.println(Arrays.toString(titles.toArray()));??

????????????//對于標簽元素的屬性，可以通過?標簽名[@屬性名]?這樣的方式獲取??

????????????String?size=config.getString("ball[@size]");??

????????????System.out.println(size);??

????????????//對于嵌套的標簽的話，想獲得某一項的話可以通過?標簽名(索引名)?這樣方式獲取??

????????????String?id=config.getString("student(1)[@id]");??

????????????System.out.println(id);??

??????????????

????????????String?go=config.getString("student.name(0)[@go]");??

????????????System.out.println(go);??

????????????/**?

?????????????*?依次輸出結果為?

?????????????*?tom?

?????????????*?[lily,?lucy]?

?????????????*?[abc,?cbc,?bbc,?bbs]?

?????????????*?20?

?????????????*?2?

?????????????*?common1?

?????????????*??

?????????????*/??

????????}?catch?(ConfigurationException?e)?{??

????????????e.printStackTrace();??

????????}??

????}</span>??

?? config.xml

???

Xml代碼??

<span?style="font-size:?medium;"><Students>??

<boy>tom</boy>??

<student?id="1">??

<name?go="common1">lily</name>??

<age>20</age>??

</student>??

<student?id="2">??

<name?go="common2">lucy</name>??

<age>30</age>??

</student>??

<title>abc,cbc,bbc,bbs</title>??

<ball?size="20">pingpang</ball>??

</Students></span>??

?

?

關于Properties的操作代碼

Java代碼??

<span?style="font-size:?medium;">public?static?void?testReadProperties(){??

????????//注意路徑默認指向的是classpath的根目錄?????

????????Configuration?config;??

????????try?{??

????????????config?=?new?PropertiesConfiguration("config.properties");??

????????????String?ip=config.getString("ip");?????

????????????int?port=config.getInt("port");?????

????????????String?title=config.getString("application.title");?????

????????????System.out.println(ip+"\n"+port+"\n"+title);?????

????????????//再舉個Configuration的比較實用的方法吧,在讀取配置文件的時候有可能這個鍵值對應的值為空，那么在下面這個方法中?????

????????????//你就可以為它設置默認值。比如下面這個例子就會在config.properties這個文件中找id的值，如果文件中沒有配置id，就會給id設置值為123?????

????????????//這樣就保證了java的包裝類不會返回空值。雖然功能很簡單，但是很方便很實用。?????

????????????String?id=config.getString("id",?"defaultid");???

????????????System.out.println(id);??

??????????????

????????????//如果在properties?文件中有如下屬性keys=cn,com,org,uk,edu,jp,hk，這樣的類似一個值含有多個元素值?????

????????????//那么下面兩種方法都可以??

????????????String[]?keys1=config.getStringArray("keys");???

????????????System.out.println(Arrays.toString(keys1));??

????????????List?keys2=config.getList("keys");????

????????????System.out.println(Arrays.toString(keys2.toArray()));??

????????????//接下來這兩步加上的原因是，默認分割符號是逗號，而在配置文件中con的值中含有多個短橫線分隔符，所以要重新設置分隔符讀出來嘍??

????????????AbstractConfiguration.setDefaultListDelimiter('-');??

????????????config?=?new?PropertiesConfiguration("config.properties");??

????????????List?cons=config.getList("con");????

????????????System.out.println(Arrays.toString(cons.toArray()));??

????????????/**?

?????????????*??

?????????????*??依次輸出結果如下?

?????????????*??127.0.0.1?

?????????????*??8080?

?????????????*??Killer?App?1.6.2?

?????????????*??defaultid?

?????????????*??[cn,?com,?org,?uk,?edu,?jp,?hk]?

?????????????*??[cn,?com,?org,?uk,?edu,?jp,?hk]?

?????????????*??[cn,?com,?org,?uk,?edu,?jp,?hk]?

?????????????*/??

????????}?catch?(ConfigurationException?e)?{??

????????????e.printStackTrace();??

????????}?????

??????????

????}</span>??

?config.properties

Java代碼??

<span?style="font-size:?medium;">ip=127.0.0.1????

port=8080????

sd=111??

application.name?=?Killer?App?????

application.version?=?1.6.2????

application.title?=?${application.name}?${application.version}?????

keys=cn,com,org,uk,edu,jp,hk??

con=cn-com-org-uk-edu-jp-hk??</span> ?

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