Java重修笔记 第六十二天 坦克大战（十二）IO 流 - BufferedInputStream 和 BufferedOutputStream、序列化和反序列化

• BufferedInputStream 和 BufferedOutputStream 的使用

public class BufferedInputStream_ {
    public static void main(String[] args) throws IOException {
        String filePath = "d:\\a.txt";
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(filePath));
        int length;
        byte[] bytes = new byte[8];
        while ((length = bufferedInputStream.read(bytes)) != -1) {
            System.out.print(new String(bytes,0,length));
        }
        bufferedInputStream.close();
    }
}

public class BufferedOutputStream_ {
    public static void main(String[] args) throws IOException {
        String filePath = "d:\\a.txt";
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(filePath, true));
        bufferedOutputStream.write("123".getBytes(StandardCharsets.UTF_8));
        bufferedOutputStream.close();
    }
}

public class BufferedCopy02_ {
    public static void main(String[] args) throws IOException {
        // 文件拷贝
        String srcFilePath = "d:\\hnt.png";
        String destFilePath = "d:\\ hntCopy.png";
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(srcFilePath));
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(destFilePath));
        byte[] bytes = new byte[1024];
        int length = 0;
        while((length = bufferedInputStream.read(bytes)) != -1) {
            bufferedOutputStream.write(bytes,0,length);
        }
        bufferedInputStream.close();
        bufferedOutputStream.close();
    }
}

• 序列化和反序列化

1. 序列化就是在保存数据时，保存的是数据的值和数据类型

2. 反序列化就是在恢复数据时，恢复的是数据的值和数据类型

3. 要让对象支持序列化机制，必须实现两个接口之一：Serializable 或者 Externalizable