代码如下：

public class MyWork {
    public static void main(String[] args) throws IOException {
        Properties pro1 = new Properties();
        pro1.setProperty("0001","张三");
        pro1.setProperty("0002","李四");
        pro1.setProperty("0003","王武");

        //写出
        File f = new File("testProperties/testObject.txt");
        FileWriter fw = new FileWriter(f);
        pro1.store(fw,null);
        fw.close();

        Properties pro2 = new Properties();
        FileReader fr = new FileReader(f);
        pro2.load(fr);
        fr.close();

        //读入
        Set<String> keys = pro2.stringPropertyNames();
        Iterator<String> it = keys.iterator();
        while (it.hasNext()) {
            String key = it.next();
            String value = pro2.getProperty(key);
            System.out.println(key + "======" + value);
        }
        //for (String key : keys) {
        //    String value = pro2.getProperty(key);
        //    System.out.println(key + "======" + value);
        //}
    }
}