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);//}}
}