java读取properties文件的方法

1：使用apache.commons组件。

需要使用jar包：commons-configuration-1.3.jar，commons-lang-2.3.jar，commons-collections.3.2.jar，commons-logging.jar

public class ConfigReader {

private static ConfigReader instance =new ConfigReader();
public static Configuration config ;
private ConfigReader(){
try{
config = new PropertiesConfiguration("test.properties");
}catch(NestableRuntimeException e2){
System.out.println("properties read error...");
}catch(ConfigurationException e3){
System.out.println("properties read error...");
}
}

public static  ConfigReader getInstance(){
return instance ;
}

public static void main(String args[]) throws RemoteException, NestableRuntimeException, ConfigurationException {
System.out.println(ConfigReader.getInstance().config.getProperty("userid"));
}
}

2：使用java.util.ResourceBundle（国际化使用的类）的getBundle()方法读取properties文件来获取值

public class ResourceBundleReader {
public final static Object initLock = new Object();

private final static String PROPERTIES_FILE_NAME = "property";

private static ResourceBundle bundle = null;

static {
try {
if (bundle == null) {
synchronized (initLock) {
if (bundle == null)
bundle = ResourceBundle.getBundle(PROPERTIES_FILE_NAME,Locale.CHINA);
}
}
} catch (Exception e) {
System.out.println("读取资源文件property_zh.properties失败!");
}
}
public static ResourceBundle getBundle() {
return bundle;
}
public static void setBundle(ResourceBundle bundle) {
bundle = bundle;
}


}
3:springMVC的话

<!-- 应用属性文件读入 org.springframework.beans.factory.config.PropertyPlaceholderConfigurer -->
	<bean id="applicationProperties" class="com.kuke.core.util.PropertiesHolder">
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
        <property name="locations">
            <list>
				<value>classpath:/jdbc.properties</value>
				<value>classpath:/redis.properties</value>      
				<value>classpath:/application.properties</value>              
            </list>
        </property>
    </bean>

package com.kuke.core.util;

import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

public class PropertiesHolder extends PropertyPlaceholderConfigurer {

	private static Map<String, Object> ctxPropertiesMap;

	@Override
	protected void processProperties(
			ConfigurableListableBeanFactory beanFactoryToProcess,
			Properties props) throws BeansException {
		super.processProperties(beanFactoryToProcess, props);
		ctxPropertiesMap = new HashMap<String, Object>();
		for (Object key : props.keySet()) {
			String keyStr = key.toString();
			String value = props.getProperty(keyStr);
			ctxPropertiesMap.put(keyStr, value);
		}
	}

	public static Object getContextProperty(String name) {
		return ctxPropertiesMap.get(name);
	}
}

4：利用java.util.Properties

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("ipConfig.properties");   
  Properties p = new Properties();   
  try {   
   p.load(inputStream);   
  } catch (IOException e1) {   
   e1.printStackTrace();   
  }   
System.out.println("ip:"+p.getProperty("ip")+",port:"+p.getProperty("port"));  

5：使用java.util.PropertyResourceBundle类的构造函数
示例： InputStream in = new BufferedInputStream(new FileInputStream(name));
ResourceBundle rb = new PropertyResourceBundle(in);


6：使用class.getClassLoader()所得到的java.lang.ClassLoader的getResourceAsStream()方法
示例： InputStream in = JProperties.class.getClassLoader().getResourceAsStream(name);
Properties p = new Properties();
p.load(in);

7：使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法
示例： InputStream in = ClassLoader.getSystemResourceAsStream(name);
Properties p = new Properties();
p.load(in);

补充

Servlet中可以使用javax.servlet.ServletContext的getResourceAsStream()方法
示例：InputStream in = context.getResourceAsStream(path);
Properties p = new Properties();
p.load(in);