BufferedReader

常見方法：

BufferedReader(Reader in) 接收一個Reader類的實例

readLine() 一次性從緩沖區中將內容全部讀取出來

註意：

BufferedReader中只能接收輸入流的實例

必須使用字符輸入流和字節輸入流的的轉換類InputStreamReader將字節輸入流轉換為字符流

實例：

此時關閉是由裏到外進行關閉

	public static void main(String[] args) throws IOException {
		
		//1、
		File file = new File("d:\\test.txt");
		InputStream in =new FileInputStream(file);
		//轉化流
		Reader reader = new InputStreamReader(in);
		
		//2、
		BufferedReader breader = null;
		breader = new BufferedReader(reader);
		
		String str = null;
		while((str = breader.readLine())!=null){
			System.out.println(str);
		}
		
		//3、關閉
		in.close();
		reader.close();
		breader.close();
		
	}

讀取的結果：

BufferedWriter

主要的寫方法：

註意：

BufferedReader中只能接收輸入流的實例

必須使用字符輸入流和字節輸入流的的轉換類OutputStreamWriter將字節輸入流轉換為字符流

註意：

關閉是由外至裏

    public static void main(String[] args) throws IOException {
        
        //1、
        File file = new File("d:\\test.txt");
        OutputStream   
 
out = new FileOutputStream(file);
        Writer writer = new OutputStreamWriter(out);
        
        //2、
        BufferedWriter bwriter = null;
        bwriter = new BufferedWriter(writer);
        
        
        //3、
        bwriter.write("我是MrChengs \n\r 我愛博客園");
        
        //4、關閉流資源
 

        bwriter.close();
        writer.close();
        out.close();
}

小測試復制文件內容：

    public static void main(String[] args) throws IOException {
        
        //將test.txt文件的內容復制到aaa.txt文件中
        //1、
        //被復制內容的為念
        File file = new File("d:\\test.txt");
        InputStream in = new FileInputStream(file);
        Reader reader = new InputStreamReader(in);
        //空文件  即將被test.txt的內容進行填充
        //File file1 = new File("aaa.txt");
        OutputStream out = new FileOutputStream("d:\\aaa.txt");
        Writer writer = new OutputStreamWriter(out);
        
        //2、
        BufferedWriter bwriter = null;
        bwriter = new BufferedWriter(writer);
        
        BufferedReader breader = null;
        breader = new BufferedReader(reader);
        
        
        //3、
        String str =null;
        int i = 0;
        
        while((str = breader.readLine()) != null){
            bwriter.write(str);
        }
        
        System.out.println("--");
        
        //4、關閉
        in.close();
        reader.close();
        breader.close();
        
        bwriter.close();
        writer.close();
        out.close();
}

此時出現的問題是復制的內容僅僅之後填充再一行中

解決方法：

5、IO--BufferedReader&BufferedReader