浅谈java Properties类的使用基础

import java.util.*;
import java.io.*;
public class Prop {
 public static void main(String[] args) throws IOException {
 Properties prop = new Properties();
 //向properties集合prop中存储key/value
 prop.setProperty("filename","a.avi");
 prop.setProperty("size","5M");
 //prop集合存储key/value的格式
 System.out.println(prop);
 //从prop中取出单个key/value
 prop.getProperty("filename");
 //遍历prop集合
 Set<String> keys = prop.stringPropertyNames();
 for (String key : keys) {
  String value = prop.getProperty(key);
  System.out.println(key+"="+value);
 }
 //properties集合和IO输出流集合：将prop集合中的属性集写入到文件中实现持久化
 FileOutputStream fos = new FileOutputStream("d:/temp/my.properties");
 prop.store(fos,"store test");
 //properties集合和IO输出流集合：从properties文件中读取属性集到prop1集合中
 //FileInputStream fis = new FileInputStream("d:/temp/my.properties");
 FileReader fr = new FileReader("d:/temp/my.properties");
 Properties prop1 = new Properties(); //Now it's a Null properties
 prop1.load(fr);
 System.out.println("new prop:"+prop1);
 fos.close();
 fr.close();
 }
}