import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Demo {

	public void transWriteByBuf(String s) {
		try {
			FileOutputStream fos = new FileOutputStream("imooc.txt");
			OutputStreamWriter osw = new OutputStreamWriter(fos);
			BufferedWriter bw = new BufferedWriter(osw);
			bw.write(s);
			bw.flush();
			fos.close();
			osw.close();
			bw.close();
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public String transReadByBuf() {
		String s = "";
		try {
			FileInputStream fis = new FileInputStream("imooc.txt");
			InputStreamReader isr = new InputStreamReader(fis);
			BufferedReader br = new BufferedReader(isr);
			String n = null;
			while((n = br.readLine()) != null) {
				s = s + n + "\n";
			}
			fis.close();
			isr.close();
			br.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return s;
	}
	
	public static void main(String[] args) {
		Demo d = new Demo();
		d.transWriteByBuf("你好吗");
		d.transWriteByBuf("我很好！");
		System.out.println(d.transReadByBuf());
	}

}