javaee IO流作业02

package Zy;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.Set;
/*2.用代码实现以下需求：
(1)已知配置文件config.properties中有三个键值对
        name=zhangsan
        score=80
        address=beijing
(2)使用IO字节流对象和Properties类结合使用,将配置文件中的score键的值修改为100*/
public class Zy02 {

    public static void main(String[] args) throws IOException {
        Properties pro=new Properties();
        FileInputStream fis=new FileInputStream("d:\java\config.properties");
        pro.load(fis);
        Set<String> str=pro.stringPropertyNames();
        for(String s:str){
            if(s.equals("score")){
                pro.setProperty(s, "100");                
            }else{
                pro.setProperty(s, pro.getProperty(s));                
            }
            System.out.println(s+"..."+pro.getProperty(s));
            FileOutputStream fos=new FileOutputStream("d:\java\config.properties");
            pro.store(fos, "message");
            fos.close();
    }
    }
}