자바 문자 흐름,문자 하나하나 읽 기 및 쓰기

package cwj.bbb;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;



class App 
{
	public static void main(String[] args) throws IOException
	{ 
        /*
         *          /home/cwjy1202/FoodMart.xml
         *               /home/cwjy1202/hadoop/javaTest/foodmart0.txt
         * */
		File file = new File("/home/cwjy1202/FoodMart.xml");
		Reader fr = new FileReader(file);					
		Writer fw = new FileWriter("/home/cwjy1202/hadoop/javaTest/foodmart0.txt", false);
		
		//      
		int len = fr.read();
		while (-1 != len)
		{
			//    
			fw.write(len);			
			//System.out.printf("%c", len);
			len = fr.read();
		}
		
        //           。     ，      ，
        //      flush，     ，       
		fw.flush();
		fw.close();
		fr.close();
		
	}
}