java下radomAccessFile文件写入读取

package cn.stat.p2.demo;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

public class randomaccessfiledemo {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        radomwrite();
        radomread();

    }

    public static void radomread() throws FileNotFoundException, IOException {
        RandomAccessFile raf=new RandomAccessFile("demo.txt","rw");
        byte[] buf=new byte[4];
        raf.read(buf);
        String name=new String(buf);
        int age=raf.readInt();
        System.out.println("name="+name);
        System.out.println("age="+age);
        //获取指针位置
        System.out.println("当前位置="+raf.getFilePointer());

        //设定指针位置
        raf.seek(1*12);
        System.out.println("age="+raf.readInt());
        raf.close();
    }

    public static void radomwrite() throws FileNotFoundException, IOException {
        RandomAccessFile raf=new RandomAccessFile("demo.txt","rw");
        raf.write("张三".getBytes());
        raf.writeInt(97);
        raf.write("赵六".getBytes());
        raf.writeInt(98);
        raf.close();
    }

}