java下DataInputStream与DataOutputStream写入数据的同时写入数据类型

package cn.stat.p2.demo;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class datastreamdemo {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        //DataInputStream与DataOutputStream写入数据的同时写入数据类型
        writedata();
        readdata();
    }

    public static void readdata() throws IOException {
        DataInputStream dis=new DataInputStream(new FileInputStream("data.txt"));
        String str=dis.readUTF();
        System.out.println(str);
        
        
    }

    public static void writedata() throws IOException {
        
        DataOutputStream dos=new DataOutputStream(new FileOutputStream("data.txt"));
        dos.writeUTF("你好");
        dos.close();
        
    }

}