Properties类

输出方法一

//创建属性列表对象
Properties prop = new Properties();
//添加映射关系
/*prop.put("001", "张三");
prop.put("002", "李四");
prop.put("003", "王五");*/
prop.setProperty("001", "张三");
prop.setProperty("002", "李四");
prop.setProperty("003", "王五");
//创建打印流对象
PrintWriter pw = new PrintWriter("f.txt");

prop.list(pw);
//释放资源
pw.close();

输出方法二

//创建属性列表对象
Properties prop = new Properties();
//添加映射关系
prop.setProperty("001", "张三");
prop.setProperty("002", "李四");
prop.setProperty("003", "王五");
//创建输出流对象
BufferedWriter bw = new BufferedWriter(new FileWriter("g.txt"));
//store方法可以传入任意输出流,而list方法只能传入打印流
prop.store(bw,"HelloWorld");
bw.close();

输入

//创建属性列表对象
Properties prop = new Properties();
FileReader fr = new FileReader("f.txt");
prop.load(fr);
//释放资源
fr.close();
System.out.println(prop);