資料的儲存方式除了database之外,還有 properties 可以選擇，優點是使用簡單，但是相對的儲存資料類型較少。

package fothers;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Properties;
import java.util.Set;
public class PropertiesExample {
    public static void main(String[] args){
        storeProperties();
        loadProperties();
        storePropertiesWithXml();
        loadPropertiesWithXml();
    }
    public static void storeProperties(){
        Properties proper = new Properties();
        proper.setProperty("key1", "value1");
        try {
            proper.store(new FileWriter("d:\testproperties\"+"testpro.properties"), "ps");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void loadProperties(){
        Properties proper = new Properties();
        try {
            proper.load(new FileReader("d:\testproperties\"+"testpro.properties"));
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void storePropertiesWithXml(){
        Properties proper = new Properties();
        proper.setProperty("keyxml", "valuexml");
        try {
            proper.storeToXML(new FileOutputStream("d:\testproperties\"+"testpro.xml"), "ps");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void loadPropertiesWithXml(){
        Properties proper = new Properties();
        try {
            proper.loadFromXML(new FileInputStream("d:\testproperties\"+"testpro.xml"));
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}