JavaIO流（02）RandomAccessFile类详解

package cn.itcast02;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteOrder;


public class DemoRandowAccessFile01 {
     public static void main(String[] args) throws IOException {
          File file = new File("G:" + File.separator +"JavaTest"+File.separator + "test01.txt" );
/*
          RandomAccessFile rdf = new RandomAccessFile(file, "rw");
          
          //写入文件内容
          String name = " liuyan  ";
           int age = 40;

          rdf.writeBytes(name);
          rdf.writeInt(age);
          
          String name2 = " xiaoming";
           int age2 = 30;
          
          rdf.writeBytes(name2);
          rdf.writeInt(age2);
          
          String name3 = " doudou  ";
           int age3 = 24;
          
          rdf.writeBytes(name3);
          rdf.writeInt(age3);
          rdf.close();
*/   
           //读取文件内容
          RandomAccessFile rdf = new RandomAccessFile(file, "r" );
          
           //创建空间存放姓名
          
           byte[] bytes = new byte[8];
          
          rdf.skipBytes(12);
          
           for (int i = 0; i < bytes.length; i++) {
              bytes[i] = rdf.readByte();
          }
           //将byte转化为String
          String name = new String(bytes);
           int age = rdf.readInt();
          
          System. out.println("第二个人信息" +"姓名：" +name+"  " +"年龄：" +age);
          
           //指针返回到文件开头
          rdf.seek(0);
          rdf.close();       
     }
}

输出：

第二个人信息姓名：xiaoming  年龄：30