黑马程序员21-3： BufferedReader/BufferedWriter缓冲字符流，读写一行

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package cn.itcast.p2.io.charstream.buffer;

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

public class BufferedReaderDemo {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {

		FileReader fr = new FileReader("buf.txt");
	
		BufferedReader bufr = new BufferedReader(fr);
		
		String line = null;
		
		while((line=bufr.readLine())!=null){
			System.out.println(line);
		}
		/*
		String line1 = bufr.readLine();
		System.out.println(line1);
		String line2 = bufr.readLine();
		System.out.println(line2);
		String line3 = bufr.readLine();
		System.out.println(line3);
		String line4 = bufr.readLine();
		System.out.println(line4);
		String line5 = bufr.readLine();
		System.out.println(line5);
		*/
		
		
		bufr.close();
		
		
	}

	/**
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static void demo() throws FileNotFoundException, IOException {
		FileReader fr = new FileReader("buf.txt");
		
		char[] buf = new char[1024];
		
		int len = 0;
		while((len=fr.read(buf))!=-1){
			System.out.println(new String(buf,0,len));
		}
		
		fr.close();
	}

}

package cn.itcast.p2.io.charstream.buffer;

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

public class BufferedReaderDemo {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {

		FileReader fr = new FileReader("buf.txt");
	
		BufferedReader bufr = new BufferedReader(fr);
		
		String line = null;
		
		while((line=bufr.readLine())!=null){
			System.out.println(line);
		}
		/*
		String line1 = bufr.readLine();
		System.out.println(line1);
		String line2 = bufr.readLine();
		System.out.println(line2);
		String line3 = bufr.readLine();
		System.out.println(line3);
		String line4 = bufr.readLine();
		System.out.println(line4);
		String line5 = bufr.readLine();
		System.out.println(line5);
		*/
		
		
		bufr.close();
		
		
	}

	/**
	 * @throws FileNotFoundException
	 * @throws IOException
	 */
	public static void demo() throws FileNotFoundException, IOException {
		FileReader fr = new FileReader("buf.txt");
		
		char[] buf = new char[1024];
		
		int len = 0;
		while((len=fr.read(buf))!=-1){
			System.out.println(new String(buf,0,len));
		}
		
		fr.close();
	}

}

package cn.itcast.p3.io.charstream.buffer.test;

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 CopyTextByBufTest {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {

		FileReader fr = new FileReader("buf.txt");		
		BufferedReader bufr = new BufferedReader(fr);
		
		FileWriter fw = new FileWriter("buf_copy.txt");
		BufferedWriter bufw = new BufferedWriter(fw);

		String line = null;
		while((line=bufr.readLine())!=null){
			bufw.write(line);
			bufw.newLine();
			bufw.flush();
		}
		/*
		int ch = 0;
		
		while((ch=bufr.read())!=-1){
			
			bufw.write(ch);
		}
		*/
		bufw.close();
		bufr.close();
	}

}

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