javaIO之Properties：读取*.properties配置文件

1、需求：用java读取e:\demo.properties配置文件

username=root
password=12345
address=beijing

2、涉及到Properties这个类：

package com.insigma.zd.group4.liuchao.languagebase;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.Properties;

public class PropertiesDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Properties pro = new Properties();
		try {
			FileInputStream fis = new FileInputStream("e:/demo.properties");
			try {
				pro.load(new InputStreamReader(fis,"gbk"));
				Iterator<Object> it = pro.keySet().iterator();
				while(it.hasNext()){
					Object key = it.next();
					System.out.println(key+"="+pro.get(key));
				}
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

}

3、Properties的load()方法读取InputStream，读取properties文件，然后用迭代器循环输出key和value。

4、国际化方面也会用到properties文件