缓冲流的使用

可以加快流的读取速度

BufferedInputStream

BufferedOutputStream

BufferedReader

BufferedWriter

字节缓冲流

@Test
public void testBufferedInputOutputStream(){
    //1 提供读入,写出的文件
    BufferedInputStream bis = null;
    BufferedOutputStream bos = null;
    try {
        File file1 = new File("a.txt");
        File file2 = new File("a3.txt");
        //2 先创建相应的节点流 FileInputStream,FileOutputStream
        FileInputStream fis = new FileInputStream(file1);
        FileOutputStream fos = new FileOutputStream(file2);
        //3 将创建的节点流的对象作为形参传递给缓冲流的构造器重
        bis = new BufferedInputStream(fis);
        bos = new BufferedOutputStream(fos);
        //4. 具体的实现文件的复制操作
        byte[] b = new byte[1024];
        int len;
        while ((len = bis.read(b))!= -1){
            bos.write(b,0,len);
            //最后刷新缓存出去
            bos.flush();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        //5. 关闭流
        if (bos != null){
            try {
                bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (bis != null){
            try {
                bis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

字符缓冲流

@Test
public void testBufferedReader(){

    BufferedReader br = null;
    BufferedWriter bw = null;

    try {
        File file1 = new File("a.txt");
        File file2 = new File("a4.txt");

        FileReader fr = new FileReader(file1);
        FileWriter fw = new FileWriter(file2);

        br = new BufferedReader(fr);

        bw = new BufferedWriter(fw);
        String str;
        while ((str = br.readLine())!=null){
            bw.write(str+"\n");
            bw.flush();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        if (br != null){
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        if (bw != null){
            if (bw != null){
                try {
                    bw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}