Java IO-4 Properties类

pro.properties文件

1 aa=1
2 bb=2

 1 package demo05;
 2
 3 import java.io.FileReader;
 4 import java.io.FileWriter;
 5 import java.io.IOException;
 6 import java.util.Properties;
 7
 8 public class PropertiesDemo {
 9     public static void main(String[] args) throws IOException {
10         Properties p = new Properties();
11         p.setProperty("a", "1");
12         p.setProperty("b", "2");
13         System.out.println(p);
14
15         String value = p.getProperty("a");
16         System.out.println(value);
17
18         Properties p1 = new Properties();
19         FileReader fr = new FileReader("c:\\pro.properties");
20         p1.load(fr);
21         fr.close();
22         System.out.println(p1);
23
24         Properties p2 = new Properties();
25         p2.setProperty("aa", "1");
26         p2.setProperty("bb", "2");
27         FileWriter fw = new FileWriter("c:\\pro.properties");
28         p2.store(fw, "");
29         fw.close();
30     }
31 }