java中读取和写入property文件的方法

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import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.util.Enumeration;
import java.util.Properties;

public class PropertiesTest {

   /**
   * @param args
   * @throws IOException
   * @throws FileNotFoundException
   */
   public static void main(String[] args) throws FileNotFoundException, IOException {
       Properties prop = new Properties();
       // 元素的存取
       prop.setProperty("name", "xwh");
       prop.setProperty("age", "32");

       Enumeration<String> e = (Enumeration<String>) prop.propertyNames();
       while(e.hasMoreElements()) {
           String key = e.nextElement();
           String value = prop.getProperty(key);
           System.out.println(key + "=" + value);
       }

       //读取配置文件
       prop.load(new FileInputStream("src/day12/a.properties"));

       String username = prop.getProperty("username");
       String password = prop.getProperty("password");

       System.out.println("这哥们的用户名是:" + username);
       System.out.println("这哥们的密码是:" + password);


       /*写入配置文件
       BufferedReader br =
           new BufferedReader(new InputStreamReader(System.in));
       System.out.println("请输入您的用户名：");
       String username = br.readLine();
       System.out.println("请输入密码:");
       String password = br.readLine();

       prop.setProperty("username", username);
       prop.setProperty("password", password);

       prop.list(new PrintStream("src/a.properties"));
       */
   }

}

//a.properties文件如下：

name value

password 123456

username abc

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