BufferedWriter / BufferedReader 使用方法

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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
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.io.InputStream;
import java.io.Reader;

public class fileRW {

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
  // TODO Auto-generated method stub


  BufferedWriter bufferedWriter=null;
  bufferedWriter=new BufferedWriter(new FileWriter("e:/liao.txt"));

  FileReader filereader=null;
  try {
   filereader = new FileReader("e:/huang.txt");
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  BufferedReader bufferedReader=new BufferedReader(filereader);
  String str="";
  try {
   while((str=bufferedReader.readLine())!=null){
    System.out.println(str);
    bufferedWriter.write(str);
     //这里调用newline（）方法是让它输出和读取的完全一致，理由不解释
    bufferedWriter.newLine();
    bufferedWriter.flush();
      //这里一定要调用flush（）方法，如果不调用，文件中将会显示不全或者压根就不显示任何东西，理由不解释，你肯定知道
   }
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  bufferedWriter.close();
  bufferedReader.close();

}

}