java 随机访问文件RandomAccessFile

package cn.itcast.randomaccessfile.demo;

import java.io.IOException;
import java.io.ObjectInputStream.GetField;
import java.io.RandomAccessFile;

public class RandomAccessFileDemo {

	public static void main(String[] args) throws IOException {
		writemethod();
//		readmethod();
	}

	public static void readmethod() throws IOException {
		
		RandomAccessFile raf=new RandomAccessFile("raf.txt", "r");
//		raf.seek(1*8);//随机的读取。只要指定指针的位置即可。 
		
		byte[] buf = new byte[4];
		raf.read(buf);
		String name = new String(buf,"gbk");
		int age = raf.readInt();
		
		System.out.println("name="+name);
		System.out.println("age="+age);
		System.out.println("pos:"+raf.getFilePointer());
		
		raf.close();
	}

	public static void writemethod() throws IOException {

		RandomAccessFile raf=new RandomAccessFile("raf.txt", "rw");
		
		raf.write("哈哈".getBytes("gbk"));
		raf.writeInt(97);
		raf.write("嘻嘻".getBytes("gbk"));
		raf.writeInt(99);
		raf.close();
	}
}