// txt文件操作

Properties prop = new Properties();

String s = "Height=200";

String s2 = "Width=15";

FileOutputStream fos = new FileOutputStream("properties.txt");

fos.write(s.getBytes());

fos.write("\r\n".getBytes());

fos.write(s2.getBytes());

FileInputStream fis = new FileInputStream("properties.txt");

prop.load(fis); // txt:从输入字节流读取

prop.list(System.out);

System.out.println(prop.get("Height"));

// xml文件操作

Properties prop = new Properties();

prop.put("Height", "200");

prop.put("Width", "15");

FileOutputStream fos = new FileOutputStream("properties.xml");

prop.storeToXML(fos, "Properties Example"); // xml:输出流写入

FileInputStream fis = new FileInputStream("properties.xml");

prop.loadFromXML(fis); // xml:从输入流读取properties

prop.list(System.out);

Set<String> set = prop.stringPropertyNames();

System.out.println(set)