import java.io.DataInputStream;

 import java.io.DataOutputStream;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 public class Test {

     public static void main(String[] args) throws IOException {

         writeData();

         readData();

     }

     public static void readData() throws IOException {

         DataInputStream dis = new DataInputStream(new FileInputStream("F:\\IO\\data.txt"));

         String str = dis.readUTF();

         System.out.println(str);

     }

     public static void writeData() throws IOException {

         DataOutputStream dos = new DataOutputStream(new FileOutputStream("F:\\IO\\data.txt"));

         dos.writeUTF("你好");

         dos.close();

     }

 }