Properties这个类是Map集合的子类。它的父类Hashtable。但是这个类可以流进行结合，可以把集合中的数据直接保存到文件中，或者和流结合，直接把文件中的数据读取后，直接放在集合中。
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.Set;
import javax.swing.text.html.HTMLDocument.Iterator;
public class IoDemo {
public static void main(String[] args) throws IOException {
read();
}
public static void read() throws IOException {
Properties prop = new Properties();
FileInputStream fis = new FileInputStream("e:/prop.txt");
prop.load(fis);
Set set = prop.keySet();
for (java.util.Iterator it = set.iterator(); it.hasNext();) {
Object key = it.next();
Object value = prop.get(key);
System.out.println(key + "...." + value);
}
fis.close();
}
public static void save() throws IOException {
// 创建Properties对象
Properties prop = new Properties();
// 给集合中存放数据
prop.setProperty("zhangsan", "shanghai");
prop.setProperty("lisi", "beijing");
prop.setProperty("wangwu", "wuhan");
prop.setProperty("zhaoliu", "shenzhen");
FileOutputStream out = new FileOutputStream("e:/prop.txt");
prop.store(out, "lishuai");
out.close();
}
}
