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configuration/ConfigurationFactory用法(pache.commons包下)

讀取配置文件有很多種方法，現就最常用的方法作以下總結：（其他會慢慢更新）

configuration/ConfigurationFactory用法(pache.commons包下)

本文：org.apache.commons.configuration.configuration
其它：com.opensymphony.xwork2.config.configuration
            javax.security,auth.login.configuration
            net.sf.ehcache.config.configuration
            org.hibernate.cfg.configuration 等等,用方類同。

1.讀取XML文件中內容
global.xml:

<?xml version="1.0" encoding="ISO-8859-1" ?>

<engine-config>

<start-criteria>

Temperature Above -10 Celsius

</criteria>

Fuel tank is not empty

</criteria>

</start-criteria>

<volume>4 Liters</volume>

</engine-config>

讀取：

import java.util.List;

import org.apache.commons.configuration.Configuration;

import org.apache.commons.configuration.XMLConfiguration;

public class XmlConfigurationExample {

public static void main(String[] args) throws Exception {

String resource = "com/discursive/jccook/configuration/global.xml";

Configuration config = new XMLConfiguration(resource);

//只有new一個XMLConfiguration的實例就可以了.

List startCriteria = config.getList("start-criteria.criteria");

int horsepower = config.getInt("horsepower");

System.out.println( "Start Criteria: " + startCriteria );

System.out.println(horsepower);

}

2.讀取properties文件
global.properties:

threads.maximum=50

threads.minimum=20

timeout=15.52

interactive=true

color=red

speed=50

name=Default User

email=default@email.com

region=Earth

讀取：

import org.apache.commons.configuration.Configuration;

import org.apache.commons.configuration.PropertiesConfiguration;

public class PropertiesConfigurationExample {

public static void main(String[] args) throws Exception {

Configuration config = new PropertiesConfiguration(

"com/discursive/jccook/configuration/global.properties" );

System.out.println( "Speed: " + config.getFloat("speed"));

System.out.println( "Names: " + config.getString("name"));

}

3.當有多個配置文件時,就利用ConfigurationFactory對象來訪問多個不同的配置資源

ConfigurationFactory可以組合多個配置資源。然后我們就可以像訪問單個資源文件一樣來訪問他們中的屬性。

首先，我們需要創建一個xml文件來告訴工廠哪些文件將要被加載。

additional-xml-configuration.xml:

<?xml version="1.0" encoding="ISO-8859-1" ?>

</configuration>

方法1：ConfigurationFactory的定義文件是一個普通的xml文件.根元素是configuration.他飽含的子元素制定了需要裝載

的配置資源.properties是元素之一,他用來包含屬性文件

import java.net.URL;

import java.util.List;

import org.apache.commons.configuration.Configuration;

import org.apache.commons.configuration.ConfigurationFactory;

public class PropertiesXmlConfigurationExample {

public static void main(String[] args) throws Exception {

PropertiesXmlConfigurationExample example = new PropertiesXmlConfigurationExample();

ConfigurationFactory factory = new ConfigurationFactory();

URL configURL = example.getClass().getResource("additional-xml-configuration.xml");

factory.setConfigurationURL( configURL );

Configuration config = factory.getConfiguration();

List startCriteria = config.getList("start-criteria.criteria");

System.out.println( "Start Criteria: " + startCriteria );

int horsepower = config.getInt("horsepower");

System.out.println( "Horsepower: " + horsepower );

}

方法2：或者采用另外一種方法: 用到了:CompositeConfiguration,手動加上兩個配置文件

import org.apache.commons.configuration.CompositeConfiguration;

import org.apache.commons.configuration.ConfigurationException;

import org.apache.commons.configuration.PropertiesConfiguration;

import org.apache.commons.configuration.XMLConfiguration;

public class Test {

/**

* @param args

* @throws ConfigurationException

*/

public static void main(String[] args) throws ConfigurationException {

// TODO Auto-generated method stub

CompositeConfiguration config = new CompositeConfiguration();

config.addConfiguration(new PropertiesConfiguration(

"com/discursive/jccook/configuration/global.properties" ));

config.addConfiguration( new XMLConfiguration

("com/discursive/jccook/configuration/global.xml"));

List startCriteria = config.getList("start-criteria.criteria");

int horsepower = config.getInt("horsepower");

System.out.println( "Start Criteria: " + startCriteria );

System.out.println(horsepower);

System.out.println( "Speed: " + config.getFloat("speed"));

System.out.println( "Names: " + config.getString("name"));

}

Spring的ClassPathXmlApplicationContext類(ApplicationContext接口) 和 JDK中的Properties 類（Java.util中）

1.讀取XML文件中內容

(1)java bean (HelloBean.java)

package com.test;

public class HelloBean{

private String helloWorld;

public String getHelloWorld(){

return helloWorld;

}

public void setHelloWorld(String helloWorld){

this.helloWorld = helloWorld;

}

(2)xml配置文件(beanConfig.xml)

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd" >

<beans>

<value>Hello!chb!</value>

</property>

</bean>

</beans>

(3)讀取xml文件
<1>利用ClassPathXmlApplicationContext

ApplicationContext context = new ClassPathXmlApplicationContext("beanConfig.xml");

HelloBean helloBean = (HelloBean)context.getBean("helloBean");

System.out.println(helloBean.getHelloWorld());

<2>利用FileSystemResource讀取

Resource rs = new FileSystemResource("D:/software/tomcat/webapps/springWebDemo/WEB-INF/classes/beanConfig.xml");

BeanFactory factory = new XmlBeanFactory(rs);

HelloBean helloBean = (HelloBean)factory.getBean("helloBean");

System.out.println(helloBean.getHelloWorld());

2.讀取properties文件

(1)HelloBean.java同上
(2).properties配置文件(beanConfig.properties)

helloBean.class=com.test.HelloBean

helloBean.helloWorld=Hello!chb!

(3)讀取.properties文件
<1>利用spring讀取properties 文件
屬性文件中的"helloBean"名稱即是Bean的別名設定，.class用于指定類來源。
然后利用org.springframework.beans.factory.support.PropertiesBeanDefinitionReader來讀取屬性文件

BeanDefinitionRegistry reg = new DefaultListableBeanFactory();

PropertiesBeanDefinitionReader reader = new PropertiesBeanDefinitionReader(reg);

reader.loadBeanDefinitions(new ClassPathResource("beanConfig.properties"));

BeanFactory factory = (BeanFactory)reg;

HelloBean helloBean = (HelloBean)factory.getBean("helloBean");

System.out.println(helloBean.getHelloWorld());

<2>利用java.util.Properties讀取屬性文件

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("beanConfig.properties");

Properties p = new Properties();

try

{

p.load(inputStream);

} catch (IOException e1)

{

e1.printStackTrace();

}

System.out.println("class:"+p.getProperty("helloBean.class")+",value:"+p.getProperty("helloBean.helloWorld"));

posted on 2009-11-04 17:14 junly 閱讀(2514) 評論(0) 編輯收藏所屬分類: tomcat/jboss/weblogic

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