java中的Properties解释

Properties

1. 作用：读写资源配置文件

2. 键与值只能为字符串

3. 方法

setProperty(String key,String value)

getProperty(String key)

getProperty(String key,String defaultValue)

后缀：.properties

           store(OutputStream out,String comment)

           store(Writer writer, String comments)

            load(InputStream inStream)

            load(Reader reader)

            .xml

            storeToXML(OutputStream os,String comment)  :UTF-8字符集

            storeToXML(OutputStream os,String comment,String encoding)

            loadFromXML(InputStream in)

package com.bjsxt.others.pro;

import java.util.Properties;

/**
 * Properties 资源配置文件的读写
 * 1、key 与value 只能为字符串
 * 2、存储与读取
 * setProperty(String key, String value) 
 * getProperty(String key, String defaultValue)  
 * @author Administrator
 *
 */
public class Demo01 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		//创建对象
		Properties pro =new Properties();
		//存储
		pro.setProperty("driver", "oracle.jdbc.driver.OracleDriver");
		//pro.setProperty("url", "jdbc:oracle:thin:@localhost:1521:orcl");
		pro.setProperty("user", "scott");
		pro.setProperty("pwd", "tiger");
		
		//获取
		String url =pro.getProperty("url","test");
		//若所对应的值不存在，则用test代替
		System.out.println(url);
	}

}