IO流(操作基本数据类型的流对象DataStream)

IO包中的其他类

1，RandomAccessFile

随机访问文件，自身具备读写的方法

通过skipBytes(int x),seek(int x)来达到随机访问

2，管道流

PipedInputStream和PipedOutputStream

输入输出可以直接进行连接，通过结合线程使用

IO包中的其他类

1，操作基本数据类型

DataInputStream与DataOutputStream

2，操作字节数组

ByteArrayInputStream与ByteArrayOutputStream

3，操作字符数组

CharArrayReader与CharArrayWriter

4，操作字符串

StringReader与StringWriter/*
DataInputStream与DataOutputStream

可以用于操作基本数据类型的数据的流对象
*/
import java.io.*;
class DataStreamDemo
{
public static void main(String[] args) throws IOException
{
// writeData();
// readData();
writeUTFDemo();

// OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("a-utf.txt"),"utf-8");

// OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("a-gbk.txt"),"gbk");

// osw.write("你好");
// osw.close();

readUTFDemo();
}

public static void readUTFDemo()throws IOException
{
DataInputStream dis = new DataInputStream(new FileInputStream("a-utfdate.txt"));
String s = dis.readUTF();

System.out.println(s);
dis.close();
}

public static void writeUTFDemo()throws IOException
{
DataOutputStream dos = new DataOutputStream(new FileOutputStream("a-utfdate.txt"));

dos.writeUTF("你好");

dos.close();
}

public static void readData()throws IOException
{
DataInputStream dis = new DataInputStream(new FileInputStream("a-data.txt"));

int num = dis.readInt();
boolean b = dis.readBoolean();
double d = dis.readDouble();

System.out.println("num="+num);
System.out.println("b="+b);
System.out.println("d="+d);
}

public static void writeData()throws IOException
{
DataOutputStream dos = new DataOutputStream(new FileOutputStream("a-data.txt"));

dos.writeInt(234);
dos.writeBoolean(true);
dos.writeDouble(9887.543);

dos.close();
}
}