操作基本数据类型的流对象DataStream

/*
可以用于操作基本数据类型的数据的流对象。
DataInputStream与DataOutputStream

*/

import java.io.*;

class DataStreamDemo

{
public static void main(String[] args) throws IOException
{
//writeData();
//readData();

writeUTFDemo();

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

//utf-8,6字节，gbk，4字节
//osw.write("你好");
//osw.close();
readUTFDemo();

}
public static void readUTFDemo() throws IOException
{
DataInputStream dis = new DataInputStream(new FileInputStream("utf.txt"));

String s = dis.readUTF();

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

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

//要用对应的方法读出来
dos.writeUTF("你好");//不写英文，因为英文不涉及到编码

dos.close();
}

public static void readData() throws IOException
{
DataInputStream dis = new DataInputStream(new FileInputStream("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);

dis.close();
}

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

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

dos.close();
}

}