设计模式示例-适配器模式

package adapter;import java.io.IOException;/** *  * 文件IO处理接口,target *  * @author  duchao * @version  [版本号, 2012-10-16] * @see  [相关类/方法] * @since  [产品/模块版本] */public interface FileIO{    /**     * 从指定文件路径读取文件     * @param fileName     * @throws IOException     * @see [类、类#方法、类#成员]     */    public void readFromFile(String fileName)        throws IOException;        /**     * 向指定文件路径写入文件     * @param fileName     * @throws IOException     * @see [类、类#方法、类#成员]     */    public void writeToFile(String fileName)        throws IOException;        /**     * 设置一个key-value键值对     * @param key     * @param value     * @see [类、类#方法、类#成员]     */    public void setValue(String key, String value);        /**     * 获取对应key的value,没有则返回空字符串     * @param key     * @return     * @see [类、类#方法、类#成员]     */    public String getValue(String key);}

package adapter;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.Properties;/** *  * 相当于适配器模式中的适配器,继承已有的类Properties,实现了FileIO接口 *  * @author  Administrator * @version  [版本号, 2012-10-17] * @see  [相关类/方法] * @since  [产品/模块版本] */public class FileProperties extends Properties implements FileIO{        @Override    public String getValue(String key)    {        return getProperty(key, "");    }        @Override    public void readFromFile(String fileName)        throws IOException    {        load(new FileInputStream(fileName));    }        @Override    public void setValue(String key, String value)    {        setProperty(key, value);    }        @Override    public void writeToFile(String fileName)        throws IOException    {        store(new FileOutputStream(fileName), "written by FileProperties");    }    }

package adapter;import java.io.IOException;public class TestAdapter{        /** 测试适配器模式的主函数类     * @param args     * @see [类、类#方法、类#成员]     */    public static void main(String[] args)    {        FileIO fileIO = new FileProperties();        try        {            fileIO.readFromFile("c:/test.properties");            fileIO.setValue("year", "2012");            fileIO.setValue("month", "10");            fileIO.setValue("day", "17");            fileIO.writeToFile("c:/testNew.properties");        }        catch (IOException e)        {            e.printStackTrace();        }    }    }