相关代码：

package com.imooc.file;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class BufferedReadedOutput2 {
	public void transWriteBybuf()  {
		try {
			FileWriter fw=new FileWriter("hello.txt");
			BufferedWriter bw=new BufferedWriter(fw);
			bw.write("你好吗?\n");
			bw.write("我很好！");
			bw.flush();
			bw.close();
			fw.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public void transReadByBuf() {
		try {
			FileReader fr=new FileReader("hello.txt");
			BufferedReader br=new BufferedReader(fr);
			String str;
			while((str=br.readLine())!=null) {
				System.out.println(str);
			}
			br.close();
			fr.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public static void main(String[] args) {

		BufferedReadedOutput2 bro=new BufferedReadedOutput2();
		bro.transWriteBybuf();
		bro.transReadByBuf();
	}
}