properties读取

方法一：

package test;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class readproperties {
	
	public static void main(String[] args) {
		//配置文件放在src下
		InputStream inStream= (InputStream) readproperties.class.getClassLoader().
			getResourceAsStream("ApplicationResources.properties");//.ApplicationResources.properties
			
		Properties properties=new Properties();
		try {
			properties.load(inStream);
		} catch (IOException e) {
			
			e.printStackTrace();
		}
		String value=properties.getProperty("key");
		System.out.println("getProperty...................."+value);
	}
}

方法二：使用spring提供的工具类

import org.springframework.core.io.support.PropertiesLoaderUtils;

public class SpringUtils {
	
	public static void main(String[] args) {
		
		try {
			Properties props = PropertiesLoaderUtils.loadAllProperties("jdbc.properties");
			String pwd=(String) props.get("jdbc.password");
			System.out.println("数据库密码："+pwd);			
		} catch (IOException e) {
			
			e.printStackTrace();
		} 

	}

}

jdbc.properties

jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@10.10.1.1:1521:ORCL
jdbc.username=test
jdbc.password=test

遍历properties中的所有keys

Set<Object> keys = properties.keySet();//返回属性key的集合  
for (Object key : keys) {  
	System.out.println(key.toString() + "=" + properties.get(key));  
}