java学习day12--IO对比，序列化

 字节流

    FileInputStream in = new FileInputStream("d:/b.txt");
    int i1 = in.read();
    int i2 = in.read();
    int i3 = in.read();
    String s =new String(new byte[] {(byte) i1,(byte) i2,(byte) i3});
    System.out.println(s);
    byte[] b = new byte[10];
    in.read(b);
    String str = new String(b);
    System.out.println(str);

   BufferedInputStream in = new BufferedInputStream(new FileInputStream(""));
   BufferedOutputStream out = new BufferedOutputStream(new FileOutputStrea(""));
   byte[] b = new byte[1024];
   int len;
   while((len=in.read())!=-1){
    out.write(b,0,len);
    out.flush();
}

 转换流：

OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream("d:/a.txt"));
    InputStreamReader in = new InputStreamReader(new FileInputStream("d:/a.txt"));

    out.write("哈哈\n我喜欢你走在我的身旁，永远会在你的身边");
    char[] c = new char[1];
    int len;
    while((len=in.read(c))!=-1) {
        System.out.print(c);
        }
    out.close();
    in.close();

 字符缓冲流

       BufferedReader br = new BufferedReader(new FileReader("d:/a.txt"));
    BufferedWriter w = new BufferedWriter(new FileWriter("d:/b.txt") );
    char[] c = new char[10];
    br.read(c);
    System.out.println(c);
    w.write(c);
    br.close();
    w.close();

  ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("d:/a.txt"));
    People p = new People(12,"ahha");
    out.writeObject(p);
    out.close();

    ObjectInputStream in = new ObjectInputStream(new FileInputStream("d:/a.txt"));
    Object o = in.readObject();
    System.out.println(o);
    in.close();

Properties p = new Properties();
    p.load(new FileInputStream("./conf/bean.properties"));
    String name = p.getProperty("name");
    System.out.println(name);

long l = system.currentTimeMillis();